Rituximab Consolidation Research Articles

Efficacy of Chemo-Free Combination Therapy with BRAF Inhibitor and Rituximab in Classic Hairy Cell Leukemia: Insights from the French Experience

Background: Hairy cell leukemia (HCL) is a rare form of leukemia. The introduction of purine analogs has revolutionized its prognosis, leading to a life expectancy closer to that of the general population. However, patients experience relapses and require other treatment options. The BRAF V600E mutation is present in 80-100% of patients with HCL, which has prompted the use of BRAF inhibitors (vemurafenib or dabrafenib) in this condition. Recently, the combination of vemurafenib with rituximab has shown efficacy with durable responses in relapsed patients. Here, we present, for the first time, real-life data on the combination of a BRAF inhibitor with rituximab through a retrospective study involving 9 French centers. Data collection was completed by July 1, 2023. Results: We collected data from 17 patients with a male-to-female ratio of 13:4; the median age was 69 years (38-90), and 6 patients were aged over 75. The median number of previous treatments was 4 (0-7), and 3 patients were treatment-naive because they were deemed ineligible for purine analogs based on age or performance status. All 14 relapsed patients had previously received purine analogs once or multiple times (1-3). The median progression-free survival (PFS) after purine analogs was 48 months, and the median PFS after the last line of therapy was 24 months. Five patients were exposed to moxetumumab pasudotox, and 3 patients received single-agent vemurafenib previously. The BRAF V600E mutation was tested and positive for 16 patients. In our cohort, 13 patients received a combination of vemurafenib with rituximab (V+R), and 4 patients received a combination of dabrafenib with rituximab (D+R). All patients received the same regimen (Tiacci, NEMJ 2021), which included an induction phase (V+R or D+R for 8 weeks) followed by rituximab consolidation (4 injections every 15 days), except for one patient who received a rituximab sequence followed by vemurafenib. At the time of analysis, 15 out of 17 patients had completed the treatment, and the remaining 2 had completed the induction phase. Fourteen patients initiated treatment at the standard dose (960 mg bid for vemurafenib and 150 mg bid for dabrafenib), and 3 patients at a reduced dose (240-480 mg bid for vemurafenib). Toxicity of any grade was reported in 15 out of 17 patients, with 3 of them experiencing grade 3-4 toxicity. Skin toxicity was the most frequent, recorded in 12 patients (grade 1-2), leading to temporary treatment interruption in 2 patients and dose reduction in 6 patients. Other toxicities included musculoskeletal, hepatic, hematological, and cardiac, with only one patient experiencing a grade 2 infection during treatment. No secondary cancers were reported during or after treatment. Treatment was discontinued due to toxicity in 5 patients, with 4 of them resuming treatment later. Eight patients required a dosage reduction, with a median final vemurafenib dosage of 480 mg bid. At the end of treatment, 14 patients achieved a complete hematological response, and 1 patient achieved a partial response. Among the 9 patients with early response data, the median time for platelet recovery was 15 days, and for neutrophil recovery, it was 14 days. End-of-treatment bone marrow aspiration and/or biopsy was performed for 8 patients, showing a complete response in 7 patients. With a median follow-up of 12 months (4-56), only 2 patients had progressed, and as of the last update, no patients had died, and the 2 relapsed patients achieved a complete response after a new line of therapy. Conclusion: Despite a limited median follow-up of 12 months, the combination of a BRAF inhibitor with rituximab proves to be an effective regimen in heavily treated patients with HCL, achieving a 100% overall response rate. Our study confirms a rapid hematological response and an acceptable toxicity profile, even in elderly patients. The most frequent toxicity observed was cutaneous toxicity, mainly grade 1-2, and it never led to a definitive treatment discontinuation. A comparison of the two BRAF inhibitors in terms of efficacy or toxicity cannot be established due to the small sample size of patients treated with dabrafenib. Lastly, the combination of rituximab with vemurafenib or dabrafenib appears to be an interesting option in frontline treatment for patients ineligible for purine analogs.

Randomized Phase 2 Trial of First-Line Bendamustine-Rituximab (BR)-Based Induction Followed By Rituximab (R) ± Lenalidomide (L) Consolidation for Mantle Cell Lymphoma ECOG-ACRIN E1411

Introduction: Optimal initial therapy for mantle cell lymphoma (MCL) remains uncertain. Bendamustine-rituximab (BR) is commonly used. Rituximab consolidation is often added post-BR but lacks randomized supporting data. Bortezomib (V) and lenalidomide (L) have activity against MCL. The randomized phase 2 NCTN trial E1411 tested if progression-free survival (PFS) is prolonged by addition of bortezomib (V) (1.6 mg/m2 SC/IV days 1, 8) to BR (BVR vs BR) induction and/or by addition of lenalidomide (L) (15 mg/d days 1-21/28) to rituximab (LR vs R) consolidation. Prior report (ASCO 2021) indicated no significant benefit of addition of V to BR. Here we report efficacy and toxicity of LR vs R consolidation. Methods: E1411 randomized 373 patients into induction (step 1) between 2012-16, stratified by MIPI (low v intermediate v high) and age (<60 v ≥60). Randomization was to 1 of 4 arms: A) BR induction x 6 followed by R x 2 yrs, B) BVR followed by R, C) BR followed by LR, or D) BVR followed by LR. Eligible pts had untreated MCL, ≥ age 18 (amended from ≥60 when S1106 for < 65 closed), ECOG PS 0-2 and adequate hematologic and organ function. Pts without progressive disease (PD) during induction proceeded to consolidation (step 2) R vs LR. For the endpoint of PFS from start of consolidation, patients were stratified by induction strategy (BR vs BVR) for the pooled analysis of LR vs R. For step 2, 290 eligible treated consolidation patients were required to provide 89.4% statistical power to demonstrate a 37.4% reduction in the hazard ratio, using stratified log-rank test with a 10% 1-sided alpha. Results: Demographics did not differ between the groups: median age 67 (range 42-90), 73% men, ECOG PS 0-1 98%, MIPI Low/Intermed/Hi 40/31/29%. Of 293 patients that registered to consolidation, the efficacy population was 276 (17 ineligible or not treated). The planned number of consolidation treatment cycles were completed in 95/140 (67.9%) LR vs 90/136 (66.2%) R; off treatment reasons were PD 11 vs 22, AEs 15 vs 7, other 19 vs 17, respectively. Estimated PFS at 2-yrs 85.8% LR (95% CI 78.6-90.7) vs 77.7% R (95% CI 69.5-84.0) (1-sided stratified log-rank p=0.416); hazard ratio for LR vs R = 0.96 (80% CI 0.75, 1.23). Of 119 PFS events (57 LR; 62 R), 29 are death without PD, 40 with PD have died, 50 alive post-PD. With median PFS follow-up of 5.8 years, median PFS estimated in the pooled arms is 6.1 years from step 2 registration. Of 74 pts not in CR post-induction, 50% (n=37) converted to CR (18 on LR & 19 on R arm). Calculating overall PFS from study registration (includes induction + consolidation), the 2-yr PFS and median PFS (years) for the 4 individual arms were BR-R (80.7%, 6.0), BVR-R (82.8%, 6.6), BR-LR (83.3%, 7.8), BVR-LR (94.2%, 7.7). Limiting the analysis to patients over age 60 (87% of patients on study) the 2 year and median PFS in each arm, starting from study registration, was BR-R (81.2%, 6.0), BVR-R (81.0%, 6.2), BR-LR (81.2%, 5.7), BVR-LR (93.2%, 7.7). Grade ≥ 3 toxicities were 87.0% LR vs 64.1% R, mostly neutropenia 58.9 vs 19.7%, with febrile neutropenia 6.8 vs 3.5%. The only non-hematologic grade ≥ 3 toxicity in > 5% of pts was lung infection/pneumonitis/URI (9.6 vs 4.2%); with 3 potentially treatment-related deaths (MI & invasive SCC on LR, MDS on R). Second malignancies by arm were: BR-R (17), BVR-R (21), BR-LR (23), BVR-LR (34) [data is from 64 unique patients; 19 patients had >1 second malignancy]. Conclusions: Lenalidomide did not significantly improve the primary endpoint of PFS when added to R as consolidation of BR-based induction as initial MCL therapy. Further follow-up continues as > ½ of pts remain alive and without progression. Each treatment arm was tolerable and deliverable to the majority of patients. The high CR rate and mPFS of 6+ years from start of BR-based induction + R-based fixed duration consolidation support this approach for 1st-line MCL therapy in individuals not appropriate for more intensive approaches, and as a platform for broader clinical trials (e.g. EA4181). Figure 1View largeDownload PPTFigure 1View largeDownload PPT Close modal

ECOG-ACRIN E1411 randomized phase 2 trial of bendamustine-rituximab (BR)-based induction followed by rituximab (R) ± lenalidomide (L) consolidation for Mantle cell lymphoma: Effect of adding bortezomib to front-line BR induction on PFS.

7503 Background: Optimal initial therapy for mantle cell lymphoma (MCL) remains uncertain. The randomized phase 2 NCTN trial E1411 tested if progression-free survival (PFS) is prolonged by addition of bortezomib (V) (1.6 mg/m2 SC/IV days 1, 8) to bendamustine-rituximab (BVR vs BR) induction and/or by addition of lenalidomide (L) to rituximab (LR vs R) consolidation. Here we report efficacy and toxicity of induction BVR vs BR. Methods: 373 pts, accrued 2012–16, stratified by MIPI and age (≥60) received 1 of 4 arms: A) BR induction x 6 followed by R x 2 yrs, B) BVR followed by R, C) BR followed by LR or D) BVR followed by LR. Eligible pts had untreated MCL, ≥ age 18 (amended from ≥60 when S1106 for &lt; 65 closed), ECOG PS 0-2 and adequate hematologic and organ function. Pts without progressive disease during induction proceeded to consolidation. Primary induction objective was whether adding bortezomib (BVR) (Arms B + D) to BR (Arms A + C) improves PFS, irrespective of consolidation R vs LR. Design of 360 eligible treated pts would provide 93.8% power to detect 10% improvement in 2-yr PFS from 70% hypothesized for BR, corresponding to 37.4% reduction in hazard using stratified log-rank test at 1-sided 10% alpha. Efficacy population was 179 (BVR) and 180 (BR), induction treatment completed in 144 vs 153, progressive disease during induction 6 vs 7 and registration to consolidation 140 vs 145. Results: Baseline demographics did not differ between the groups, with median age 67 (range 42-90) and 13% &lt; 60 yr, 73% men, ECOG PS 0-1 97%, MIPI Low/Med/Hi 37/29/34%. Estimated PFS at 2 yrs 79.6% BVR (95% CI 73.8-85.9) vs 74.5% BR (95% CI 68.2-81.4) (1-sided stratified log-rank p = 0.268). With median PFS follow-up 51 mos, median PFS estimated at 64.1 and 64.0 mos. Overall response rate (ORR) for BVR was 88.9% (CR 65.5%) vs 89.5% (CR 60.5%) BR (z-test 1 sided p = 0.577 for ORR). Treatment related deaths during induction were 2 in BVR (cardiac arrest, hepatitis) and 1 in BR (tumor lysis). Grade ≥ 3 toxicities were 88.1% (163/185) BVR vs 77.5% (145/187) BR. For BVR vs BR grade ≥ 3 neutropenia occurred in 52 vs 39 pts, though febrile neutropenia (7 vs 6), anemia (7 vs 8) and thrombocytopenia (18 vs 16) did not differ. Peripheral neuropathy (PN) grade 2 was 8 sensory for BVR vs 2 sensory/1 motor for BR, while grade 3 PN was 6 sensory/1 motor for BVR vs 0 with BR. The only non-hematologic grade ≥ 3 toxicity in &gt; 5% of pts was rash (9 vs 12 pts). Conclusions: Bortezomib did not significantly improve the primary endpoint of PFS when added to BR as initial MCL therapy. ORR and CR rates at end of induction were also similar. Follow-up continues to assess the entire treatment regimen, including consolidation R vs LR, but the PFS &gt; 5 yrs, high ORR and MRD negativity rate (Smith et al ASH 2019) in this BR-based trial support BR as a platform for MCL induction therapy. Clinical trial information: NCT01415752.

Consolidation Treatment and Long-Term Prognosis of Rituximab in Minimal Change Disease and Focal Segmental Glomerular Sclerosis.

PurposeThere is currently a lack of studies investigating long-term prognosis and the necessity of further rituximab (RTX) consolidation treatment for minimal change disease (MCD) and focal segmental glomerulosclerosis (FSGS). The aim of this study was to evaluate the efficacy of RTX for these diseases and to investigate whether a consolidation treatment can lower risks of relapse and reinforce long-term remission.Patients and MethodsA retrospective study was conducted. The relapse and remission of 70 patients treated with 1 course of RTX treatment (4 infusions of 375 mg/m2) over a median follow-up time of 27 months (12–60 months) were analyzed. The rates of patients that were able to achieve non-relapse for a duration of 24 months between RTX consolidation therapy and non-consolidation therapy were compared.ResultsThere were 67 cases (95.71%) of remission and 3 cases (4.29%) of non-remission. The average number of relapses decreased from 3.7±2.5 times before the treatment to 0.8±1.8 times after treatment (P <0.001). The average avannual number of relapses decreased from 1.3±1.2 times/year to 0.2±0.3 times/year (P <0.001). The results from the Cox proportional-hazards model showed that the risk of relapse in patients who received RTX non-consolidation treatment was significantly higher than those with consolidation treatment (odds ratios (OR) 20.9, 95% confidence intervals (CI) OR 5.7–75.7, p<0.001). The 24-month relapse-free rate was also significantly higher in patients with consolidation therapy compared with non-consolidation therapy (86.36% vs 25%, p<0.001). No adverse events were recorded.ConclusionRTX is highly effective in treating MCD and FSGS, and RTX consolidation therapy may be recommended to reinforce long-term remissions.

CLL-358: First-Line Treatment of Hairy Cell Leukemia with Cladribine Followed by Rituximab Consolidation Significantly Improves Leukemia-Free Survival

Context Purine analogue therapy remains the standard of care in hairy cell leukemia (HCL) management. Despite high remission rates, many patients subsequently relapse and require re-treatments. Objective The aim of this study is to compare the effectiveness and safety of cladribine vs. cladribine followed by rituximab consolidation as first-line therapy of HCL. Design This is a retrospective study including all consecutive patients with classical HCL treated and followed at the American University of Beirut Medical Center (AUBMC) between 2000 and 2019. Methods We identified 29 HCL patients, with a median age of 50.5 (range: 30–71) years. Patients were divided into two cohorts based on treatment received: cohort A (N=14) received cladribine 5.6 mg/m2 intravenously (IV) for 7 days as a single agent, and cohort B (N=15) received the same dose of cladribine followed by rituximab 375 mg/m2 IV weekly for eight doses. Rituximab consolidation was given after a median time of 33 days (17–60 days) from cladribine completion. Complete remission rates were 64% and 100% in cohorts A and B, respectively. In cohort A, seven (50%) patients relapsed after a median duration of 48 months (range: 1–209 months), requiring second-line treatment with cladribine followed by rituximab. In cohort B, no relapses occurred. After a median follow up of 67 months (range: 1–227 months), the 5-year disease-free survival was significantly better in group B (100%) compared to group A (58%) (HR=0.16, 95% CI: 0.032–0.84, p=0.03). There was no significant difference in overall survival between the two groups. Grade 3/4 adverse events were observed in 92%% and 80% of patients in cohorts A and B, respectively, mainly neutropenia (78.5% vs 66.6%) and febrile neutropenia (71% vs. 40%). One patient in cohort B who received rituximab consolidation too early (day 17) died from febrile neutropenia and septic shock. Conclusion Consolidation rituximab after cladribine in frontline treatment of classical HCL showed high response rate of 100% and translated into a significant improvement in disease-free survival. Cladribine followed by rituximab consolidation may be considered as standard first-line therapy of HCL.

Treatment stratification in B-cell PTLD after solid organ transplantation (SOT) by international prognostic index (IPI) and response to rituximab: Interim results from the PTLD-2 trial.

8045 Background: The PTLD-1 trials have established risk-stratified sequential treatment of B-cell PTLD. After rituximab induction, patients (pts) in complete remission (25 %) received rituximab consolidation, while all others received R-CHOP. The PTLD-2 trial tests modified risk-stratification including clinical risk factors. These are the results of the 2nd scheduled interim analysis (40/60 planned pts). Methods: The prospective, multicenter phase II PTLD-2 trial (NCT02042391) enrols treatment-naïve adult SOT recipients with CD20-positive PTLD. Key exclusion criteria are CNS involvement, ECOG &gt; 2, pregnancy, and severe organ dysfunction or severe, active infection. Treatment consists of rituximab (1400 mg SC; first application 375 mg/m2 IV) on days 1, 8, 15 and 22. After restaging, pts in CR as well as those in PR with ≤ 2 IPI risk factors at diagnosis (low-risk group) continue with four three-weekly courses of rituximab. Most other pts (high-risk group) receive 4 cycles of R-CHOP-21, while thoracic SOT recipients who progress under rituximab (very-high-risk group) receive six cycles of alternating R-CHOP-21 and R-DHAOx. The primary endpoint (event-free survival in the low-risk group) is not analyzed here. Secondary endpoints presented here are response and overall response (ORR) by computed tomography, overall survival (OS), time to progression (TTP) and treatment-related mortality (TRM) overall and by risk group. Results: 40 pts were recruited at 12 centers (2015 – 2019). 21/40 were kidney, 11 lung, 4 liver, 3 heart, and 1 liver/kidney transplant recipients. Median age was 54 years. 38/40 PTLD were monomorphic and 15/40 EBV-associated. 38 pts were evaluated for response at interim staging: 13 were allocated to the low-risk, 17 to the high-risk and 8 to the very-high-risk group. ORR was 28/30 (93 %, CR: 16/30 [53 %]). With a median follow-up of 1.9 years, the 1-year/3-year Kaplan-Meier (KM) estimates of TTP and OS in the intention-to-treat population (40 pts) were 85 %/80 % and 70 %/70 %, respectively. In the low-risk group, the 2-year KM estimate of OS was 100 %. The frequency of infections (all grades) was 50 %, and TRM occurred in 3/40 pts (8 %). Conclusions: One third of enrolled pts were treated in the low-risk group and the recruitment goal for evaluation of the primary endpoint will likely be reached. Interim efficacy and toxicity data with rituximab SC and modified risk-stratification are encouraging despite the inclusion of 35 % thoracic SOT recipients. Clinical trial information: NCT02042391 .

VcR-CVAD Induction Chemotherapy Followed by Maintenance Rituximab Produces Durable Remissions in Mantle Cell Lymphoma: A Wisconsin Oncology Network Study

IntroductionVcR-CVAD was developed as an intermediate-intensity induction regimen with maintenance rituximab (MR) to improve remission durations after first-line therapy for mantle cell lymphoma (MCL) in older and younger patients with MCL. Patients and MethodsPatients with previously untreated MCL received VcR-CVAD induction chemotherapy for 6 cycles (21-day cycles). Patients achieving at least a partial response received rituximab consolidation (375 mg/m2 × 4 weekly doses) and MR (375 mg/m2 every 12 weeks × 20 doses). The primary endpoints were overall and complete response (CR), and the secondary endpoints were progression-free survival (PFS) and overall survival (OS). Thirty patients were enrolled, with a median age of 61 years. There was an even distribution of patients < 60 years and ≥ 60 years. Mantle cell lymphoma international prognostic index medium- or high-risk disease was present in 60%. The overall response rate observed was 90% (77% CR/unconfirmed CR). After a median follow-up of 7.8 years, the 6-year PFS and OS were 53% and 70%, respectively. There was no difference in 6-year PFS or OS between the younger (age < 60 years) and older (age ≥ 60 years) subgroups. In a univariate analysis, lactate dehydrogenase, when analyzed for interaction with age, had a significant effect on PFS outcomes at 6 years. There were no pretreatment variables determined to have a significant effect on OS outcomes at 6 years. ConclusionsLong-term outcomes with VcR-CVAD are comparable with more intensive inductions and consolidation approaches. MCL is biologically heterogeneous, and durable remission can be achieved with intermediate intensity therapy. MR appears to contribute to these excellent outcomes.

B-cell Function Gene Mutations in Diffuse Large B-cell Lymphoma: A Retrospective Cohort Study

Diffuse large B-cell lymphoma (DLBCL) is a heterogeneous subtype of non-Hodgkin lymphoma. In addition to clinical and immunophenotypic characteristics, recurrent gene mutations have recently been identified in patients with DLBCL using next-generation sequencing technologies. The aim of this study is to investigate the clinical relevance of B-cell function gene mutations in DLBCL. Clinical analysis was performed on 680 Chinese DLBCL patients (146 non-CR and 534 CR cases) treated with six cycles of 21-day R-CHOP (Rituximab, cyclophosphamide, doxorubicin, vincristine, and prednisone), alone or followed by two additional doses of rituximab consolidation on patients' own intention. Somatic mutations of B-cell function genes were further screened on 275 (71 non-CR and 204 CR) cases with available tumor samples by targeted sequencing, including genes involved in B-cell receptors (BCRs) pathway (CARD11, LYN, CD79A, and CD79B), Toll-like receptors (TLRs) pathway (MYD88), and tumor necrotic factor receptor (TNFR) pathway (TRAF2 and TNFAIP3). B-cell function gene mutations occurred in 44.0% (121/275) of DLBCL patients. The TLRs and TNFR related gene mutations were more frequently observed in non-CR patients (p=0.019 and p=0.032, respectively). BCRs related gene mutations, as well as revised IPI (R-IPI) and double BCL-2/MYC expression, were independently related to short progression-free survival in DLBCL after CR. The adverse prognostic effect of BCRs related gene mutations could be overcome by two additional doses of rituximab consolidation. These results highlight the molecular heterogeneity of DLBCL and identify a significant role of B-cell function gene mutations on lymphoma progression and response to rituximab in DLBCL.

Newly diagnosed and relapsed follicular lymphoma: ESMO Clinical Practice Guidelines for diagnosis, treatment and follow-up

Newly diagnosed and relapsed follicular lymphoma: ESMO Clinical Practice Guidelines for diagnosis, treatment and follow-up

Response to Rituximab Induction Is a Predictive Biomarker in Post-Transplant Lymphoproliferative Disorder (PTLD) and Allows Successful Treatment Stratification in an International Phase II Trial Including 152 Patients

Response to Rituximab Induction Is a Predictive Biomarker in Post-Transplant Lymphoproliferative Disorder (PTLD) and Allows Successful Treatment Stratification in an International Phase II Trial Including 152 Patients

LONG-TERM Outcome of a Fondazione Italiana Linfomi Study Comparing Short Rituximab Maintenance Vs Observation after Brief First-LINE R-FND Chemoimmunotherapy Followed By Rituximab Consolidation in Elderly Patients with Advanced Follicular Lymphoma (FL)

Introduction: we previously reported (Vitolo U, JCO 2013) the results of a randomized study with brief first-line chemoimmunotherapy followed by rituximab maintenance vs observation. With a median follow-up of 42 months, 3-year Progression Free Survival (PFS) and Overall Survival (OS) were 66% and 89%, respectively. The addition of Rituximab maintenance gave a benefit to the patients: 2-year PFS was 81% for rituximab maintenance versus 69% for observation with a HR of 0.63 (95% CI: 0.38-1.05, p=0.079), although not statistically significant. Moreover we also found that achievement of Minimal Residual Disease (MRD) negativity predicted a better PFS: 3-year PFS 72% vs 39%, HR 3.1 (Ladetto M, Blood 2013). Overall these data showed the good efficacy of this brief chemoimmunotherapy regimen in elderly FL patients. Aim of this analysis was to report long-term outcome and long-term toxicities of this regimen.Methods: From January 2004 to December 2007, 242 treatment-naive patients aged 60-75 years with FL Grade I, II and IIIa were enrolled by 33 FIL centres. Patients had to have advanced (high tumor burden stage II or stage III-IV) disease requiring treatment: 4 monthly courses of R-FND (standard doses of Rituximab, Fludarabine, Mitoxantrone, Dexamethasone) every 28 days followed by 4 weekly Rituximab infusions as consolidation. Responders patients [complete remission (CR) + unconfirmed CR + partial remission (PR)] were randomized to brief rituximab maintenance (Arm A), once every 2 months for a total of 4 doses, or observation (Arm B). MRD for the bcl-2/IgH translocation was determined on bone marrow cells in a centralized laboratory belonging to Euro-MRD consortium, using qualitative and quantitative PCR.Results: a total of 234 patients began chemoimmunotherapy: after induction and consolidation treatment overall response rate was 86%, with 69% CR. Of these, 210 completed the planned treatment and 202 responders were randomized. Up to date, median follow-up were 96 months from enrollment and 87 months from randomization; additional follow-up data were available for 127/146 (87%) not relapsed/progressed patients. Five- and 7-year PFS for the whole population were 57% and 51%, respectively; 5- and 7-year OS for the whole population were 85% and 80%, respectively. From enrollment, an advantage in term of PFS and also OS was observed in FLIPI low risk patients: 7-year PFS was 67% for low risk versus 38% for intermediate-high risk patients (p<0.001) and 7-year OS was 86% versus 75%, respectively (p=0.03). After randomization, no differences between the two arms were detected for both PFS and for OS at 5 (data not showed) and 7 years: 7-year PFS was 55% for rituximab maintenance arm versus 52% for observation arm (p=0.331; HR 0.8); 7-year OS was 83% for both arms (p=0.208; HR 0.67). Moreover, after randomization no differences between the two arms were detected for both FLIPI low risk and intermediate-high risk patients: 7-year PFS was 67% for Rituximab maintenance arm versus 68% for observation arm (p=0.808) in low risk patients; in intermediate-high risk patients 7-year PFS was 46% vs 35% (p=0.301), respectively in Arm A vs B. Conversion to PCR negativity at the end of treatment maintains predictive value for better PFS: 7-year PFS were 58% and 36% (p=0.084), respectively for MRD negative vs positive patients. The same risk of late toxicity (infections or cardiac events) or secondary cancers was observed in both arms: in particular, 13 secondary neoplasms in maintenance arm vs 16 in observation arm were recorded.Conclusions: the present long-term results of this trial with a prolonged follow-up of 7 years confirm that a good outcome is achievable in elderly FL patients with a short-term chemoimmunotherapy (R-FND + Rituximab consolidation) with a 7-year PFS of 51% and low toxicity. In addition these results did not show clear evidence in favor of a shortened Rituximab maintenance after R-fludarabine containing chemotherapy. Conversely, the achievement of PCR negativity maintains predictive value for a better outcome. [Display omitted] DisclosuresOff Label Use: Rituximab maintenance was not licensed in first-line treatment for follicular lymphoma at that time in Italy; Rituximab was provided free by Roche.

PP-082 DELAYED ENGRAFTMENT DUE TO CANDIDA NORVEGENSIS IN HDC AND SCT PATIENT

Diffuse large B-cell lymphoma (DLBCL) is a heterogeneous subtype of non-Hodgkin lymphoma. In addition to clinical and immunophenotypic characteristics, recurrent gene mutations have recently been identified in patients with DLBCL using next-generation sequencing technologies. The aim of this study is to investigate the clinical relevance of B-cell function gene mutations in DLBCL. Clinical analysis was performed on 680 Chinese DLBCL patients (146 non-CR and 534 CR cases) treated with six cycles of 21-day R-CHOP (Rituximab, cyclophosphamide, doxorubicin, vincristine, and prednisone), alone or followed by two additional doses of rituximab consolidation on patients' own intention. Somatic mutations of B-cell function genes were further screened on 275 (71 non-CR and 204 CR) cases with available tumor samples by targeted sequencing, including genes involved in B-cell receptors (BCRs) pathway (CARD11, LYN, CD79A, and CD79B), Toll-like receptors (TLRs) pathway (MYD88), and tumor necrotic factor receptor (TNFR) pathway (TRAF2 and TNFAIP3). B-cell function gene mutations occurred in 44.0% (121/275) of DLBCL patients. The TLRs and TNFR related gene mutations were more frequently observed in non-CR patients (p = 0.019 and p = 0.032, respectively). BCRs related gene mutations, as well as revised IPI (R-IPI) and double BCL-2/MYC expression, were independently related to short progression-free survival in DLBCL after CR. The adverse prognostic effect of BCRs related gene mutations could be overcome by two additional doses of rituximab consolidation. These results highlight the molecular heterogeneity of DLBCL and identify a significant role of B-cell function gene mutations on lymphoma progression and response to rituximab in DLBCL.

PP-083 SECONDARY ALL IN MULTIPLE MYELOMA PATIENT WHO UNDERWENT HDC AND SCT

Diffuse large B-cell lymphoma (DLBCL) is a heterogeneous subtype of non-Hodgkin lymphoma. In addition to clinical and immunophenotypic characteristics, recurrent gene mutations have recently been identified in patients with DLBCL using next-generation sequencing technologies. The aim of this study is to investigate the clinical relevance of B-cell function gene mutations in DLBCL. Clinical analysis was performed on 680 Chinese DLBCL patients (146 non-CR and 534 CR cases) treated with six cycles of 21-day R-CHOP (Rituximab, cyclophosphamide, doxorubicin, vincristine, and prednisone), alone or followed by two additional doses of rituximab consolidation on patients' own intention. Somatic mutations of B-cell function genes were further screened on 275 (71 non-CR and 204 CR) cases with available tumor samples by targeted sequencing, including genes involved in B-cell receptors (BCRs) pathway (CARD11, LYN, CD79A, and CD79B), Toll-like receptors (TLRs) pathway (MYD88), and tumor necrotic factor receptor (TNFR) pathway (TRAF2 and TNFAIP3). B-cell function gene mutations occurred in 44.0% (121/275) of DLBCL patients. The TLRs and TNFR related gene mutations were more frequently observed in non-CR patients (p = 0.019 and p = 0.032, respectively). BCRs related gene mutations, as well as revised IPI (R-IPI) and double BCL-2/MYC expression, were independently related to short progression-free survival in DLBCL after CR. The adverse prognostic effect of BCRs related gene mutations could be overcome by two additional doses of rituximab consolidation. These results highlight the molecular heterogeneity of DLBCL and identify a significant role of B-cell function gene mutations on lymphoma progression and response to rituximab in DLBCL.

Treatment of high-risk aggressive B-cell non-Hodgkin lymphomas with rituximab, intensive induction and high-dose consolidation: long-term analysis of the R-MegaCHOP-ESHAP-BEAM Trial

We have studied the feasibility and efficacy of intensified R-MegaCHOP-ESHAP-BEAM therapy in high-risk aggressive B-cell lymphomas. Altogether 105 patients (19–64 years) with diffuse large B-cell lymphoma (DLBCL), primary mediastinal B-cell lymphoma (PMBL) or follicular lymphoma grade 3 (FL3) with an age-adjusted International Prognostic Index of 2–3 were recruited. Treatment consisted of three cycles of high-dose R-CHOP (rituximab, cyclophosphamide, doxorubicin, vincristine, prednisone), followed by three cycles of R-ESHAP (rituximab, etoposide, methylprednisolone, cytarabine, cisplatin) and high-dose consolidation with BEAM (BCNU, etoposide, cytarabine, melphalan) and autologous stem cell transplant. The 5-year progression-free survival (PFS) was 72% (DLBCL 60%, PMBL 89%) and overall survival (OS) was 74% (DLBCL 61%, PMBL 89%) after a median follow-up of 85 months. However, an independent prognostic factor was age only, with patients ≤ 45 years having 5-year PFS 90% and patients > 45 years having PFS 54%. PMBL had better prognosis than DLBCL/FL3 in patients > 45 years (PFS, 88% vs. 48%), but not in younger patients (PFS, 91% vs. 94%).

Weekly Four Times Rituximab Consolidation Following Reduced Cycles Of R-CHOP Induction Chemotherapy In Extremely Elderly Patients With Diffuse Large B Cell Lymphoma

▪ PurposePoor outcome of patients with elderly diffuse large B-cell lymphoma (DLBCL) has been linked to their decreased ability to receive full course of R-CHOP, dose-reduction of chemotherapy due to toxicities and their concomitant disease to interrupt the treatment. Recently, several studies suggested that attenuated R-CHOP regimen or reduced cycles of R-CHOP showed the survival benefit along with good tolerability and safety for very elderly patients. The study is aimed to determine objective response, toxicitiy and clinical outcome of weekly four times rituximab augmentation after reduced cycles of R-CHOP in extremely elderly patients with DLBCL. Patients and MethodsProspective, multi-institutional phase II trial was conducted for patients with previously untreated CD20+ diffuse large B cell lymphoma who aged more than 70 years and achieved complete or partial response after 4th R-CHOP chemotherapy (NCT01181999). R-CHOP was infused every 21 days, with initial dose-intensity of CHOP regimen was modulated according to Charlson Comorbidity Index (CCI). If patients were with CCI <1, patients were treated with standard dose of CHOP, however, if patients with CCI °Ã1, patients were with 75% of conventional dose initially. Rituximab consolidation (375mg/m2) was treated weekly four times, at the time of full recovery after 4th R-CHOP. Trimethoprim/sulfamethoxasole (160mg/800mg, 1T orally) was given daily during rituximab consolidation. Response assessment based on Revised International Workshop Criteria was evaluated at the completion of the fourth R-CHOP, after rituximab consolidation and whenever disease progression is suspected. Results51 DLBCL patients were enrolled from 14 institutes between June 2010 and April 2013. Median age was 76 years (range: 70-89) and 35.3% patients had more than 2 concomitant chronic disease. 36 out of 51 patients could be proceeded toward weekly four times rituximab consolidation. High treatment-related mortality (13.7%) during R-CHOP was huddle to proceeding to consolidation treatment. 35 patients (68.6%) presented with high-intermediate or high risk based on IPI and 12 patients (23.5%) were classified with a score of 2 by Glasgow prognostic score (GPS). After a median follow-up of 18.6 months, overall response rate was 70.6% with 66.7% of complete response and 3.9% of partial response. 31 patients (60.8%) were started with decreased dose of CHOP with median 75% reduction of CHOP (range; 50-100%). 2-year probability of progression-free survival (PFS) was 71.5 ±7.9% with 10 relapses. GPS based on systemic inflammatory indicators was a useful prognostic indicator for PFS compared to IPI. The adverse events were mainly related with hematologic toxicities and neutropenic infections during R-CHOP. However, no toxicities were reported associated with rituximab weekly infusion and no adverse events related with delayed infection after rituximab consolidation. ConclusionsRituximab consolidation after reduced cycles of R-CHOP resulted in a favorable response with high tolerability. Debulking R-CHOP and followed by weekly rituximab consolidation could be a good compromise between efficacy and tolerability for extremely elderly DLBCL▪ Disclosures:No relevant conflicts of interest to declare.

Rituximab Maintenance Compared With Observation After Brief First-Line R-FND Chemoimmunotherapy With Rituximab Consolidation in Patients Age Older Than 60 Years With Advanced Follicular Lymphoma: A Phase III Randomized Study by the Fondazione Italiana Linfomi

To evaluate the efficacy of rituximab maintenance in 60- to 75-year-old patients with advanced follicular lymphoma responding to brief first-line chemoimmunotherapy followed by rituximab consolidation. A total of 234 treatment-naive 60- to 75-year-old patients began chemoimmunotherapy with four monthly courses of rituximab, fludarabine, mitoxantrone, and dexamethasone (R-FND) followed by four weekly cycles of rituximab consolidation. Of these, 210 patients completed the planned treatment, and 202 responders were randomly assigned to rituximab maintenance (arm A) for 8 months, once every 2 months for a total of four doses, or to observation (arm B). Median ages in arms A and B were 66 and 65 years, respectively. After induction and consolidation therapy, the overall response rate was 86%, with 69% complete remissions (CR). After a 42-month median follow-up from diagnosis, 3-year progression-free survival (PFS; the primary end point) and overall survival (OS) were 66% (95% CI, 59% to 72%) and 89% (95% CI, 85% to 93%), respectively. After randomization, 2-year PFS was 81% for rituximab maintenance versus 69% for observation, with a hazard ratio of 0.74 (95% CI, 0.45 to 1.21; P = .226), although this was not statistically significant. No differences between the two arms were detected for OS. Overall, the regimen was well-tolerated. The most frequent grade 3 to 4 toxicity was neutropenia (25% of treatment courses), with 13 infections. Two toxic deaths (0.8%) occurred during induction treatment. A brief R-FND induction plus rituximab consolidation achieved excellent results with high CR and PFS rates, supporting the feasibility of this regimen in patients older than 60 years. A short rituximab maintenance did not achieve a statistically significant PFS improvement over observation.

One Size Does Not Fit All in Follicular Lymphoma

One Size Does Not Fit All in Follicular Lymphoma

Brief Chemoimmunotherapy Rituximab, Bendamustine, Mitoxantrone (R-BM) Followed by Rituximab Consolidation in Elderly Patients with Untreated Advanced Stage Follicular Lymphoma (FL): Preliminary Results of a Prospective Phase II Study by Fondazione Italiana Linfomi (FIL).

AbstractAbstract 2720 Introduction:Bendamustine is a promising agent that has been showed high efficacy in combination with Rituximab in indolent lymphomas; however experiences on its use in combination with other cytotoxic agents are scant, particularly in FL. A previous FIL trial showed that a brief R-FND induction chemoimmunotherapy with only 4 courses of R-chemotherapy followed by 4 rituximab doses as consolidation can achieve high CR and PFS rates in FL patients, supporting the feasibility of this regimen in the elderly (Vitolo et al, ASH 2011). These promising results prompted FIL to investigate safety and efficacy of a similar combined brief regimen substituting Bendamustine for Fludarabine aimed at reducing toxicity and maintaining efficacy. Patients and methods:From September 2009 to November 2011, 76 elderly patients (age 65–80) with advanced stage FL at diagnosis were enrolled. Inclusion criteria were: untreated grade I, II and IIIa FL; advanced disease requiring treatment (stage III/IV) or stage II including at least one of the following conditions: bulky disease (>7 cm), active disease with rapid lymph node progression, lactate dehydrogenase or β2 microglobulin above normal, systemic symptoms and extranodal involvement. A comprehensive geriatric assessment (ADL, I-ADL, CIRS) was also performed at diagnosis and only “FIT” patients were enrolled into the study. Treatment plan was: 4 monthly courses of R-BM (375 mg/m2 Rituximab day 1, 90 mg/m2 Bendamustine days 1–2, 8 mg/m2 Mitoxantrone day 1), followed by consolidation with 4 weekly Rituximab infusions. Polymerase chain reaction (PCR) for BCL2/IgH rearrangement was performed on bone marrow samples at diagnosis, after R-BM and after consolidation. Results:At the time of analysis, 69/76 patients are evaluable for clinical characteristics, response to treatment and toxicity. Median age was 71 years (range 65–80); 26 males, 43 females; WHO grading was as follow: I 16%, II 55% and IIIa 29%; 19% had advanced stage II disease, 27% stage III and 54% stage IV; 49% had BM involvement, 19% B symptoms and 7% leukemic dissemination; 58% patients had no comorbidity, 20% one and 22% two or more comorbidities. According to FLIPI patients were: 12% at low, 30% at intermediate and 58% at high risk. PCR analysis was carried out in 64 patients at diagnosis: 58% were Bcl-2 positive. Sixty three patients completed the planned treatment and the whole program was completed according to the planned time in 60/63 patients. Six patients did not complete the treatment: 1 for progressive disease, 4 for adverse events (2 haematological toxicity with prolonged neutropenia; 1 CMV colitis and 1 for infection and concomitant worsening of pre-existing oral pemfigo) and 1 patient for worsening of performance status. Overall response after R-BM + Rituximab was observed in 64 (96%) patients with 52 (75%) patients in complete remission and 12 (18%) in partial remission (PR). Response to 4 cycles of R-BM was as follow: 27 (39%) in CR, 37 (54%) in PR and 5 (7%) patients in stable (SD) or progressive disease. Of the 40 patients in PR or SD after 4 R-BM, 26 (65%) converted to CR following further Rituximab consolidation. At the time of this analysis, of the 37 patients Bcl-2 rearranged at diagnosis, 19 (51%) were evaluable for molecular response during and after treatment. PCR negativity was achieved in 16/19 (84%) patients after R-BM and in 18/19 (95%) patients at the end of treatment. A total of 521 courses of R-BM and Rituximab were given. The most frequent severe toxicity (CTC grade 3–4) was neutropenia reported in 18% of the courses; nevertheless only four serious infections were recorded (all due to bacterial agents). Pulmonary and cardiac toxicities were < 1%. Two deaths were recorded: one due to lymphoma after second line treatment and one due to hepatic carcinoma occurred 3 months after completion of therapy. Conclusions:A brief course of chemo-immunotherapy R-BM followed by Rituximab consolidation is safe and effective with a high CR rate in elderly patients with untreated advanced stage FL. Planned future analysis of the entire study will give further information on late toxicity and outcome. Disclosures:Off Label Use: In Europe use of Bendamustine in first-line treatment of follicular lymphoma is off-label. Drug was provided free by Mundipharma. Vitolo:Roche: Membership on an entity's Board of Directors or advisory committees.

Gemcitabine, Dexamethasone, Cisplatin (GDP) Compared to Dexamethasone, Cytarabine, Cisplatin (DHAP) Chemotherapy Prior to Autologous Stem Cell Transplantation for Relapsed and Refractory Aggressive Lymphomas: Final Results of the Randomized Phase III NCIC CTG Study LY12

AbstractAbstract ▪745▪This icon denotes a clinically relevant abstract Background:The optimum chemotherapy combination prior to autologous stem cell transplantation (ASCT) for patients with relapsed or refractory aggressive non-Hodgkin lymphomas (NHL) has not been defined. We previously established the safety and efficacy of outpatient treatment with GDP in a phase II study (Crump et al, Cancer 2004) leading to this phase III trial testing the hypothesis that GDP is as effective and less toxic than standard DHAP, and potentially associated with better quality of life (QoL) and less resource utilization. Methods:Patients (pts) with relapsed/refractory aggressive NHL were stratified by IPI score at relapse (0, 1 vs 2,vs >=3 risk factors), immunophenotype (B vs T cell), disease status following initial treatment (response duration < 1yr vs duration > 1yr vs no response/PD) and prior treatment with rituximab (R); and were randomized to 2–3 21-day cycles of G 1000 mg/m2 day 1 & 8, D 40 mg day 1–4, P 75 mg/m2day 1 or standard DHAP. Pts with CR, PR (or SD, per institutional policy) proceeded to PBSC collection and ASCT. The protocol was amended 11/2005 to include R with GDP or DHAP for pts with CD20+ lymphoma. Co-primary endpoints were response rate (RR) after 2 cycles (CR/CRu/PR) according to 1999 International Workshop criteria, and transplantation rate; FDG-PET was not used to determine response. Using a non-inferiority design, the study was powered to exclude a 10% difference in RR between GDP and DHAP (α 0.05, power 80%). Other endpoints included toxicity, event-free (EFS) and overall survival (OS), QoL and an economic analysis. FACT-G, FACT-CNS and FACT-LYM instruments and validated lymphoma-specific questions were used to assess QoL. Results of a second randomization to post-ASCT rituximab consolidation vs observation for pts with CD20+ lymphoma will be reported subsequently. Results:From 8/2003 to 11/2011, 619 pts were enrolled at 52 centres in Canada, Italy, Australia and the US (GDP 310 DHAP 309). Pt characteristics: median age 55 yrs (28.4% >60 y); histology: DLBCL 71%, PTCL 4%, ALCL 4%, transformed 14%; IPI risk factors: 0,1: 38%, 2: 29%; >3: 33%; elevated LDH 59%; prior R treatment 67%; refractory to initial therapy 31%; all baseline characteristics were balanced between treatment arms. In the intention to treat (ITT) population, RR for GDP was 45.2% and for DHAP 44.0%. The upper boundary of the one-sided 95.6% confidence interval for the difference in RRs was 5.67% and did not cross the pre-specified 10% non-inferiority boundary, meaning protocol-stated criteria for declaring GDP non-inferior to DHAP were met (p=0.005); results were robust when assessed using a per-protocol analysis. 362/554 pts (65.3%) with B cell NHL received R with protocol therapy: RRs were similar between arms in pts with and without prior R exposure, and with and without R added to GDP or DHAP. The transplantation rate was 51.8% for GDP vs 49.3% for DHAP (per protocol analysis; p = 0.49); 6 pts in each arm could not mobilize adequate PBSCs. At a median follow-up of 53 months, 4 year EFS was 25.6% and 26.1% (HR 0.99, p=0.95) and 4 year OS 39.0% and 39.1% (HR 1.03, p=0.78) for GDP and DHAP, respectively. Pts receiving GDP experienced less grade 3–4 toxicity (47 vs 61%, p=0.0003), including febrile neutropenia (9 vs 23%, p<0.0001), platelet transfusion during the first 2 treatment cycles (18% vs. 32%, p < 0.0001) and AEs requiring hospitalization (18 vs 30%, p=0.0005). One pt in each arm died from infection during GDP/DHAP therapy (0.3%). Compared to baseline, superior mean and greater-than-minimally-important change scores for QoL were seen during and/or after 2 treatment cycles in the GDP group when assessed using FACT-LYM, the Trial Outcome Index for FACT-LYM and the lymphoma-specific subscale. Stratified by important baseline characteristics, in univariate analysis no variables were associated with response; in multivariate analysis, ECOG PS, stage and number of sites of disease were significantly associated with OS; age and stage were associated with EFS. Conclusion:The response rate to GDP is not inferior to the standard regimen DHAP prior to ASCT for aggressive lymphomas and GDP resulted in similar rates of transplantation, EFS and OS. GDP can be given in the outpatient setting with significantly less toxicity, superior QoL scores and reduced need for hospitalization. This study supports the use of GDP as a new standard in practice and in future studies focused on improving salvage therapy approaches. Disclosures:Crump:Roche Canada: Membership on an entity's Board of Directors or advisory committees. Off Label Use: Gemcitabine for treatment of lymphoma. Kuruvilla:Roche: Honoraria, Membership on an entity's Board of Directors or advisory committees, Research Funding. Macdonald:Roche Canada: Membership on an entity's Board of Directors or advisory committees, Research Funding. Kukreti:Roche: Honoraria. Kouroukis:Roche: Honoraria. Meyer:Dr. Meyer has received honoraria from Lilly re role on a DSMC: Honoraria. Olney:Roche: Consultancy.

Rituximab, ofatumumab and other monoclonal anti-CD20 antibodies for chronic lymphocytic leukaemia.

Chronic lymphocytic leukaemia (CLL) accounts for 25% of all leukaemias and is the most common lymphoid malignancy in western countries. Standard treatments include mono- or polychemotherapies, usually combined with monoclonal antibodies such as rituximab or alemtuzumab. However, the impact of these agents remains unclear, as there are hints for increased risk of severe infections. The objectives of this review are to provide an evidence-based answer regarding the clinical benefits and harms of monoclonal anti-CD20 antibodies (such as rituximab, ofatumumab, GA101) compared to no further therapy or to other anti-leukaemic therapies in patients with CLL, irrespective of disease status. We searched the Cochrane Central Register of Controlled Trials (The Cochrane Library Issue 12, 2011), MEDLINE (from January 1990 to 4 January 2012), and EMBASE (from 1990 to 20 March 2009) as well as conference proceedings (American Society of Hematology, American Society of Clinical Oncology, European Hematology Association and European Society of Medical Oncology) for randomised controlled trials (RCTs). We included RCTs examining monoclonal anti-CD20 antibodies compared to no further therapy or to anti-leukaemic therapy such as chemotherapy or monoclonal antibodies in patients with newly diagnosed or relapsed CLL. We used hazard ratios (HR) as effect measures for overall survival (OS), progression-free survival (PFS) and time to next treatment, and risk ratios (RR) for response rates, treatment-related mortality (TRM) and adverse events (AEs). Two review authors independently extracted data and assessed quality of trials. We screened a total of 1150 records. Seven RCTs involving 1763 patients were identified, but only five could be included in the two separate meta-analyses we performed. We judged the overall the quality of these trials as moderate to high. All trials were randomised and open-label studies. However, two trials were published as abstracts only, therefore we were unable to assess the potential risk of bias for these trials in detail.Three RCTs (N = 1421) assessed the efficacy of monoclonal anti-CD20 antibodies (i.e. rituximab) plus chemotherapy compared to chemotherapy alone. The meta-analyses showed a statistically significant OS (HR 0.78, 95% confidence interval (CI) 0.62 to 0.98, P = 0.03, the number needed to treat for an additional beneficial effect (NNTB) was 12) and PFS (HR 0.64, 95% CI 0.55 to 0.74, P < 0.00001) advantage for patients receiving rituximab. In the rituximab-arm occurred more AEs, World Health Organization (WHO) grade 3 or 4 (3 trials, N = 1398, RR 1.15, 95% CI 1.08 to 1.23, P < 0.0001; the number needed to harm for an additional harmful outcome (NNTH) was 9), but that did not lead to a statistically significant difference regarding TRM (3 trials, N = 1415, RR 1.19, 95% CI 0.70 to 2.01, P = 0.52).Two trials (N = 177) evaluated rituximab versus alemtuzumab. Neither study reported OS or PFS. There was no statistically significant difference between arms regarding complete response rate (CRR) (RR 1.21, 95% CI 0.94 to 1.58, P = 0.14) or TRM (RR 0.31, 95% CI 0.06 to 1.51, P = 0.15). However, the CLL2007FMP trial was stopped early owing to an increase in mortality in the alemtuzumab arm. More serious AEs occurred in this arm (43% with alemtuzumab versus 22% with rituximab; P = 0.006).Two trials assessed different dosages or time schedules of monoclonal anti-CD20 antibodies. One trial (N = 104) evaluated two different rituximab schedules (concurrent arm: fludarabine plus rituximab (Flu-R) plus rituximab consolidation versus sequential arm: fludarabine alone plus rituximab consolidation). The comparison of the concurrent versus sequential regimen of rituximab showed a statistically significant difference of the CRR with 33% in the concurrent-arm and 15% in the sequential-arm (P = 0.04), that did not lead to statistically significant differences regarding OS (HR 1.14, 95% CI 0.20 to 6.65, P = 0.30) or PFS (HR 0.96, 95% CI 0.43 to 2.15, P = 0.11). Furthermore results showed no differences in occurring AEs, except for neutropenia, which was more often observed in patients of the concurrent arm. The other trial (N = 61) investigated two different dosages (500 mg and 1000 mg) of ofatumumab in addition to FluC. The arm investigating ofatumumab did not assess OS and a median PFS had not been reached owing to the short median follow-up of eight months. It showed no statistically significant differences between arms regarding CRR (32% in the FCO500 arm versus 50%in the FCO1000 arm; P = 0.10) or AEs (anaemia, neutropenia, thrombocytopenia). This meta-analysis showed that patients receiving chemotherapy plus rituximab benefit in terms of OS as well as PFS compared to those with chemotherapy alone. Therefore, it supports the recommendation of rituximab in combination with FluC as an option for the first-line treatment as well as for the people with relapsed or refractory CLL. The available evidence regarding the other assessed comparisons was not sufficient to deduct final conclusions.