Tolerability Of Rituximab Research Articles

Safety and Tolerability of Rituximab in the Treatment of Systemic Sclerosis.

Rituximab (RTX) has been used for the treatment of systemic sclerosis (SSс) for a long time and has shown good efficacy for skin fibrosis and interstitial lung disease (ILD). However, data on tolerability and long-term adverse events (AEs) during RTX therapy in SSc are insufficient. The objective of this study was to assess the tolerability and safety of RTX in patients with SSс in a long-term prospective follow-up. Our open-label prospective study included 151 SSс patients who received at least one RTX infusion. The mean age of the patients was 47.9 ± 13.4 years; the majority of them were women (83%). The mean disease duration was 6.4 ± 5.8 years. The mean follow-up period after the first RTX infusion was 5.6 ± 2.6 years (845.6 patient-years (PY)). All patients received RTX in addition to ongoing therapy with prednisone and/or immunosuppressants. AEs were assessed and recorded by a doctor in the hospital immediately after RTX infusion and then by patient's reported outcome during the observation period. All causes of death were considered, regardless of treatment. A total of 85 AEs (56%) were registered, the overall incidence of AEs was 10/100 PY (95% confidence interval (CI) 8-12). The highest frequency of all AEs was observed in the first 2-6 months after the first course of RTX, however, these were mainly mild and moderate AEs (71%). The most frequent AEs were infections, they were observed in 40% of cases, with no serious opportunistic infections reported. The overall incidence of all infections was 7.1/100 PY (95% CI 5.5-9), serious infections-1.5/100 PY (95%CI 0.9-2.6). Infusion reactions occurred in 8% of patients. Other AEs were noted in 3% (0.6/100 PY, 95% CI 0.3-1.4). The overall incidence of serious AEs was 18%-3.2/100 PY (95% CI 2.2-4.6). There was a significant decrease of the immunoglobulin G (Ig G) during follow-up; however, its average values remained within normal limits. There were 17 deaths (11%) (2/100 PY, 95% CI 1.3-3.2). In most cases, patients died from the progression of the major organ failure, which arose before RTX treatment. In our study, the safety profile of RTX in SSс was assessed as favorable. It was similar to the AE profile in other autoimmune diseases treated with RTX. With an increase in the cumulative dose of RTX, no increase in AEs was observed. The mortality is comparable to the other severe autoimmune diseases in observational studies. Monitoring of IgG may be useful for patients with SSс on RTX therapy for early detection of the risk of developing infectious complications. RTX could be considered as a relatively safe drug for the complex therapy of SSс when standard therapy is ineffective or impossible.

Off-label use of rituximab in patients with systemic lupus erythematosus with extrarenal disease activity: a retrospective study and literature review.

Off-label rituximab is commonly used for patients with systemic lupus erythematosus (SLE) with extrarenal disease activity. The outcomes and tolerability of rituximab in adult patients with non-renal SLE treated at our hospital from 2013 to 2020 were described. Patients were followed-up until December 2021. Data were retrieved from electronic medical records. Response was classified into complete, partial or no response according to the Systemic Lupus Erythematosus Disease Activity Index 2000 (SLEDAI 2 K)-based definitions. A total of 44 cycles were administered to 33 patients. Median age was 45 years and 97% were female. Median follow-up was 5.9 years (IQR 3.7-7.2). The most frequent symptoms that motivated rituximab use were thrombocytopenia (30.3%), arthritis (30.3%), neurological manifestations (24.2%) and cutaneous lupus (15.2%). After most treatment cycles a partial remission was achieved. The median SLEDAI-2 K score declined from 9 (IQR 5-13) to 1.5 (IQR 0-4) (p < 0.00001). The median number of flares significantly declined after receiving rituximab. Platelet counts significantly improved in patients with thrombocytopenia and patients with skin disorders or neurological manifestations also had a partial or complete response. Only 50% of patients with a predominant joint involvement had either a complete or a partial response. The median time to relapse after the first cycle was 1.6 years (95% CI, 0.6-3.1). Anti-dsDNA levels decreased significantly after rituximab from a median of 64.3 (IQR 12-373.9) to 32.7 (IQR 10-173), p = 0.00338. The most frequent adverse events were infusion-related reactions (18.2%) and infections (57.6%). All patients needed further treatment to maintain remission or to treat new flares. A partial or complete response was documented after most rituximab cycles in patients with non-renal SLE. Patients with thrombocytopenia, neurolupus, and cutaneous lupus had better response than those with a predominant joint involvement.

Safety and tolerability of rituximab in the treatment of systemic sclerosis

Introduction. Rituximab (RTX) has been used for the treatment of systemic sclerosis (SSс) for a long time and has shown good efficacy for skin fibrosis and interstitial lung disease. However, data on tolerability and long-term adverse events (AEs) during RTX therapy in SSc are insufficient.Objective. The aim of this study was to assess the tolerability and safety of RTX in patients with SSс in a long-term prospective follow-up.Materials and methods. Our open-label prospective study included 151 SSс patients who received at least one RTX infusion. The mean age of the patients was 47.9±13.4 years; the majority of them were women (83%). The mean disease duration was 6.4±5.8 years. The mean follow-up period after the first RTX infusion was 5.6±2.6 years (845.6 patient-years (PY)). All patients received RTX in addition to ongoing therapy with prednisone and/or immunosuppressants. AEs were assessed and recorded by a doctor in the hospital immediately after RTX infusion, then by patient reported outcome during the observation period. All causes of death were considered, regardless of treatment.Results. A total of 85 (56%) AEs were registered, the overall incidence of AEs was 10/100 PY (95% confidence interval (95% CI): 8–12). The highest frequency of all AEs was observed in the first 2–6 months after the first course of RTX, however, these were mainly mild and moderate AEs (71%). The most frequent AEs were infections, they were observed in 40% of cases, with no serious opportunistic infections reported. The overall incidence of all infections was 7.1/100 PY (95% CI: 5.5–9), serious infections – 1.5/100 PY (95% CI: 0.9–2.6). Infusion reactions occurred in 8% of patients. Other AEs were noted in 3% (0.6/100 PY; 95% CI: 0.3–1.4). The overall incidence of serious AEs was 18% (3.2/100 PY; 95% CI: 2.2–4.6). There was a significant decrease of the immunoglobulin G (IgG) during follow-up, however, its average values remained within normal limits. There were 17 (11%) deaths (2/100 PY; 95% CI: 1.3–3.2). In most cases, patients died from the progression of the major organ failure, which arose before RTX treatment.Conclusions. In our study, the safety profile of RTX in SSс was assessed as favorable. It was similar to the AE profile in other autoimmune diseases treated with RTX. With an increase in the cumulative dose of RTX, no increase in AEs was observed. The mortality is comparable to the other severe autoimmune diseases in observational studies. Monitoring of Ig G may be useful for patients with SSс on RTX therapy for early detection of the risk of developing infectious complications. RTX could be considered as a relatively safe drug for the complex therapy of SSс when standard therapy is ineffective or impossible.

A retrospective study of the safety and efficacy of rituximab in Iranian patients with myasthenia gravis: A single-center experience.

Background: This retrospective cohort study was conducted to evaluate the efficacy and tolerance of rituximab (RTX) for the management of myasthenia gravis (MG). Methods: This retrospective cross-sectional study was conducted on 61 patients with refractory and non-refractory MG who received RTX. The Myasthenia Gravis Activities of Daily Living (MG-ADL) profile was used to assess MG symptoms and their effects on daily activities at the start of RTX and in the last follow-up. The Myasthenia Gravis Foundation of America Post-Intervention Status (MGFA-PIS) scale has been used as an outcome measure after treatment with RTX in the 12th month and the last follow-up. Results: The mean age of the patients was 40.31 ± 13.53 years (range: 15-78 years). Of 61 patients, eight (13.1%) were double seronegative, 29 (47.5%) had anti-acetylcholine receptor (AChR+) antibody, and 24 (39.3%) had anti-muscle-specific tyrosine kinase antibody (MuSK+). According to the mean rank table, the results of this study showed that the drug was more effective in improving the symptoms of MuSK+ patients compared to the other two groups (P = 0.006). The mean MG-ADL was 4.86 ± 1.83 before treatment and 1.51 ± 2.02 in the last follow-up visit. Paired t-test showed a significant association between MG-ADL before and after treatment in the last visit [t(55): 11.30, 95% confidence interval (CI): 2.79-3.99, P = 0.001)]. Conclusion: This retrospective study showed a considerable effect of RTX as induction therapy in patients with MG, especially those with MuSk+ MG.

Off-Label Use of Rituximab in Patients with Different Types of Nephropathies in a Tertiary Hospital: A Retrospective Study.

Off-label use of rituximab is commonly requested for patients with resistant nephropathies. The outcomes and tolerability of rituximab in adult patients with nephropathy treated at our hospital (from 2013 to 2018) were described. Data were retrieved from electronic medical records. Response was classified as complete remission (CR), partial remission (PR), or no response (NR) according to the KDIGO criteria. A total of 89 requests were received for 61 patients. Median age was 58 years (45.9% female). Idiopathic membranous nephropathy (MN) (n = 30) was the most frequent indication, followed by minimal change disease (MCD) (n = 15) and secondary membranoproliferative glomerulonephritis (MPGN) (n = 12). Three patients with focal segmental glomerulosclerosis (FSGS) were included. After most treatment cycles in MN, a CR or PR was observed; median proteinuria levels significantly decreased for these patients (6000 mg/24h (IQR 3584–10,300) vs. 1468.8 (IQR 500–4604.25), p < 0.01). In MPGN, no response was documented after 46.7% of rituximab cycles. A CR or PR was described with the majority of rituximab cycles in MCD, with a significant decrease in proteinuria (6000 mg/24 h (IQR 4007–11,426) vs. 196.8 (IQR 100–1300), p = 0.013). No cycles produced a response in FSGS. Mean CD19+ B-cell decreased in all types of nephropathy (10.44% vs. 0.29%, p < 0.0001). Eleven patients presented infusion-related reactions, and 17 presented infectious complications. The majority of patients with MN and MCD had complete or partial responses; however, neither MPGN nor FSGS had encouraging results.

Efficacy and tolerability of rituximab and reduced-dose cyclophosphamide, doxorubicin, vincristine, and prednisolone therapy for elderly patient with diffuse large B-cell lymphoma

ABSTRACTObjectives: Chemoimmunotherapy with cyclophosphamide, doxorubicin, vincristine, and prednisolone combined with rituximab (R-CHOP) is currently the first-line therapy for diffuse large B-cell lymphoma (DLBCL). However, management of elderly patients is challenging and often requires dose reductions or prolonged treatment intervals. We investigated the proper dose of R-CHOP for them.Methods: At our institute, for DLBCL patients aged 65–79 and ≥80 years, we had reduced CHOP dose to 5/6 and 7/12, respectively, and retrospectively evaluated the reduced-dose R-CHOP.Results: Although the median age in the standard, 5/6, and 7/12-dose groups was 57, 73, and 84 years, respectively (p < 0.001), the 3-year event-free survival (EFS) rate did not differ between the standard and 5/6-dose groups (60.2 and 56.7%); however, 7/12-dose group had significantly inferior survival (25.9%). When patients aged 60–80 were evaluated, no difference in EFS was observed between the standard and 5/6-dose groups using the same international prognostic index. The neutrophil nadir and the frequency of infection were comparable among the three dose groups.Discussion and Conclusions: Reduced-dose R-CHOP chemotherapy is a promising treatment for elderly patients with DLBCL in terms of efficacy and toxicity.

Benefits of rituximab as a second-line treatment for autoimmune haemolytic anaemia in children: a prospective French cohort study.

Childhood autoimmune haemolytic anaemia (AIHA) requires second-line immunosuppressive therapy in 30-50% of cases. It appears that rituximab is indicated in such circumstances. This prospective national study reports the practice, efficacy and tolerance of rituximab in children with isolated AIHA and AIHA in the setting of Evans syndrome (ES). Sixty-one children were given rituximab between 2000 and 2014. The median interval from diagnosis to rituximab was 9·9 [interquartile range (IQR) 1·6-28·5] months. Forty-six patients responded (75%) and the 6-year relapse-free survival (RFS) was 48%. Twenty patients relapsed at a median interval of 10·8 (IQR 3·9-18·7) months, rituximab allowed steroid withdrawal in 44/61 (72%) of children. In isolated AIHA, complete response and 6-year RFS were significantly higher than in ES (P<0·05). Ten out of 61 patients were infants, seven of who responded with a 6-year RFS of 71%. Among patients without immunoglobulin substitution before rituximab, 4 are still receiving substitutions. Five patients died, including one potentially attributable to rituximab. This large observational series of childhood AIHA established the rituximab benefit-risk ratio, allowing steroid withdrawal, with 37% of long-term responders, mainly in isolated AIHA. All subgroups of patients drew benefit. Our long-term results indicate the baseline to be challenged by new treatment approaches.

Resistant myasthenia gravis and rituximab: A monocentric retrospective study of 28 patients

This retrospective study evaluated the efficiency and tolerance of rituximab in the management of resistant myasthenia gravis (MG). All patients who received rituximab for the treatment of MG between 2004 and 2015 at Pitié-Salpétrière University Hospital (Paris, France) were included. The efficacy of rituximab was evaluated every 6 months by the myasthenic muscle score (MMS), the Myasthenia Gravis Foundation of America – Clinical Classification (MGFA-CC), the MGFA Therapy Status and the Postintervention Status (PIS). All rituximab-related side effects were noted. Twenty-eight patients were included: 21 with anti-acetylcholine receptor antibodies, 3 with anti-muscle-specific tyrosine kinase antibodies and 4 seronegatives. The mean age at day 1 of RTX was 50.6 ± 12.0 years. Patients previously received 1–4 immunosuppressants. The mean follow-up was 27.2 months (range: 6–60 months). The mean total dose of rituximab was 4.8 ± 2.5 g. The initial median MMS (58.8 points) improved significantly at M6 (74.5 ± 15.0 points; p < 0.0001) and remained stable thereafter: at M12: 75.9 ± 14.0 points (p = 0.00014), at M36: 72.5 ± 13.1 points (p = 0.0013). Among 16 patients with initial severe symptoms (MGFA-CC class IV), 14 improved. The PIS showed efficacy in about 50% of patients: at M6, 12/28 (43%) patients were considered improved. This benefit remained stable thereafter: at M12: 12/24, at M24: 7/17, at M36: 6/12. One patient developed a delayed progressive multifocal leukoencephalopathy. Based on the PIS, rituximab may be efficient in 50% of patients with MG resistant to immunosuppressants.

Is There a Best Initial Treatment for a New Patient With Low Grade Follicular Lymphoma.

The treatment landscape for newly diagnosed follicular lymphoma (FL) has dramatically changed over the past decade, first with the advent of rituximab and then with the activity of old and new drugs, like bendamustine and lenalidomide, in this disease. The efficacy and tolerability of rituximab has led to a paradigm shift for the management of patients with low volume FL for many oncologists. Despite the lack of a survival benefit seen with this approach, many now use this single agent in patients who had historically been observed. Likewise, its use as maintenance therapy following successful front-line induction therapy of patients with symptomatic FL, with either rituximab alone or specific chemoimmunotherapy regimens, has improved remission duration and widely been adopted. As newer chemoimmunotherapy regimens, like bendamustine and rituximab, have superior outcomes with improved tolerability, upfront treatment options are redefined and questions emerge: whom do maintenance strategies benefit, and what is the optimal sequencing of therapies? Finally, as newer targeted and potentially better tolerated therapies demonstrate efficacy in the relapsed setting, their use, both in combination with and in place of chemotherapy, is being explored. The promising regimen of lenalidomide with rituximab is being compared with chemoimmunotherapy in a randomized fashion. Cure remains elusive, however, in advanced stage disease and so safety and tolerability, in addition to efficacy, remain important endpoints.

RITPBC: B-cell depleting therapy (rituximab) as a treatment for fatigue in primary biliary cirrhosis: study protocol for a randomised controlled trial

IntroductionPrimary biliary cirrhosis (PBC) is an autoimmune liver disease with approximately 50% of patients experiencing fatigue. This can be a particularly debilitating symptom, affecting quality of life and resulting in...

FRI0505 Efficacy and Tolerability of Rituximab in Idiopathic Inflammatory Myopathies in A Monocentric Experience

BackgroundHigh doses of corticosteroids (CS) alone or in association with (and/or) traditional immunosuppressive drugs are considered the first choice treatment of idiopathic inflammatory myopathies (IIM). Patients refractory to traditional therapy...

SAT0299 Rituximab Treatment of the Antisynthetase Syndrome

BackgroundAntisynthetase syndrome (ASS) is a severe variant of idiopathic inflammatory myopathies. Unfavorable prognosis of this disease is associated with interstitial lung disease (ILD). Conventional treatment with glucocorticoids (GC) and cytotoxic...

RITUXIMAB TREATMENT FOR INTERSTITIAL LUNG INJURY IN SCLERODERMA SYSTEMATICA

Objective: to study the efficiency and tolerance of rituximab (RTM) treatment in patients with scleroderma systematica (SDS) with interstitial lung injury (ILI). Subjects and methods. The trial included 27 patients (26 women and 1 man) (mean age 45.7±13.0 years), with diffuse (n=13) and circumscribed (n = 14) forms and a disease duration of > 5 years in 63%. All the patients underwent chest computed tomography; examination of external respiratory function, including forced vital capacity (FVC) and diffusing capacity of the lung (DCL), as well as echocardiographic study. The efficiency of the treatment was evaluated from changes in FVC, skin score, and disease activity index. The indicators were compared prior to the treatment and one year after the first administration of RTM. The latter was injected with premedication (125–500 mg of methylprednisolone intravenously) 500–1000 mg per administration. The mean dose of RTM was low and amounted to 1.3 g per year. Results. As estimated by the physician, good, satisfactory, no effects were seen in 81.5, 14.8, and 3.7% of the patients, respectively. There was a significant increase in mean FVC one year after the first administration of RTM and a reduction in the total activity of the disease, including skin syndrome. DCL was substantially unchanged in the entire group. In the diffuse and circumscribed forms of the disease, FVC increased significantly and to the same extent. A clinically significant increase in FVC (by 11%) was achieved in patients with a disease duration of ≤5 years and mild lung injury. In people with a more than 5-year disease duration, FVC was initially decreased to a greater extent and the treatment-induced increase was only 3.7%. A significant and permanent decline in peripheral blood B lymphocytes was noted when both the standard dose (2 g) of RTM and its lower doses (0.5–1 g) were administered. RTM treatment was well tolerated, but complicated by mild intercurrent infections in 11% of cases within the first 2 months after RTM administration. Conclusion. The findings substantiate the indications for RTM use primarily in the early stage of the disease. The admittedly low doses of RTM have an inadequate effect if the disease is long-lasting. Further study of dosage regimens for RTM is required within the framework of controlled trials.

AB0751 Successfull maintenance treatment of granulomatous polyangiitis (wegener) with rituximab - a case series

BackgroundGranulomatous polyangiitis (GPA) is a chronic relapsing systemic vasculitis and repeated remission treatment with cyclophosphamide poses long term safety risks. Studies of rituximab (RTX) have reported successful remission in patients...

Efficacy and Tolerability of Rituximab in Patients With Rhupus

Rhupus in an infrequent disease in which an overlap between lupus eritematosus and rheumatoid arthritis exists. Joint manifestations are prominent and treatment with nonbiological DMARDs is not always satisfactory, so immunosuppressors and biological agents have been tried.A prospective, open clinical study was done to evaluate efficacy and tolerability of rituximab in patients with rhupus. The main objective was a change in DAS28 at 6 months and secondary objectives were a change in MEX-SLEDAI at 6 months, change in DAS28 and MEX-SLEDAI during follow up, steroid requirements and detection of adverse events.We included 9 women with a mean age of 43 years and disease duration of 10 years. A significant reduction in DAS28 was observed (from 5.73 at baseline to 3.02 at 6 months, P<.001). Improvement in DAS28 was maintained during follow up. At 6 months, 3 patients were in remission and 3 had low disease activity. MEX-SLEDAI diminished from 5 points at baseline to 1.22 at 6 months (P<.001). There was a negative correlation between clinical improvement and anti-CCP levels (r=−0.794, P=.011). Mean prednisone dose was reduced from 11.66mg/day at baseline to 0.55 and 1.11mg/day at 12 and 24 months. Treatment was well tolerated.In this study rituximab was effective not only for joint affection but also for other manifestations of the disease. We consider that this biological agent can be a good therapeutic option for patients with rhupus.

Eficacia y tolerabilidad de rituximab en el tratamiento de pacientes con rhupus

Rhupus in an infrequent disease in which an overlap between lupus eritematosus and rheumatoid arthritis exists. Joint manifestations are prominent and treatment with non biological DMARDs is not always satisfactory, so immunosupressors and biological agents have been tried.A prospective, open clinical study was done to evaluate efficacy and tolerability of rituximab in patients with Rhupus. The main objective was a change in DAS28 at 6 months and secondary objectives were a change in MEX-SLEDAI at 6 months, change in DAS28 and MEX-SLEDAI during follow up, steroid requirements and detection of adverse events.We included 9 women with a mean age of 43 years and disease duration of 10 years. A significant reduction in DAS28 was observed (from 5.73 at baseline to 3.02 at 6 months, P<.001). Improvement in DAS28 was maintained during follow up. At 6 months, 3 patients were in remission and 3 had low disease activity. MEX-SLEDAI diminished from 5 points at baseline to 1.22 at 6 months (P<.001). There was a negative correlation between clinical improvement and anti-CCP levels (r=-0,794, P=.011). Mean prednisone dose was reduced from 11.66mg/day at baseline to 0,55 and 1.11mg/day at 12 and 24 months. Treatment was well tolerated.In this study rituximab was effective not only for joint affection but also for other manifestations of the disease. We consider that this biological agent can be a good therapeutic option for patients with rhupus.

Efficacy of rituximab in systemic manifestations of primary Sjögren's syndrome: results in 78 patients of the AutoImmune and Rituximab registry

ObjectivesTo evaluate the efficacy and safety of rituximab in patients with primary Sjögren's syndrome (pSS).MethodsThe AutoImmune and Rituximab registry has included 86 patients with pSS treated with rituximab, prospectivey followed...

Therapy with rituximab for autoimmune pemphigus: Results from a single-center observational study on 42 cases with long-term follow-up

Rituximab induces depletion of B cells and has shown efficacy in antibody-mediated autoimmune disorders. In studies on small series of patients with pemphigus, rituximab administration results in significant improvement. However, differences in inclusion criteria, treatment protocols, and follow-up make it difficult to derive uniform conclusions. We sought to test the efficacy and tolerability of rituximab as adjuvant therapy to corticosteroids in the treatment of pemphigus. In all, 42 patients with pemphigus were treated with rituximab and followed up for up to 5 years. No additional immunosuppressive agents were used. Steroids were rapidly tapered. Outcomes were the proportion of patients who achieved a complete response on or off therapy, the rate of discontinuation of corticosteroid within 6 months, length of remission, time to relapses, and occurrence of adverse events. In all, 36 of 42 patients (86%; 95% confidence interval 75%-96%) achieved a complete response on or off therapy and discontinued steroids within 6 months from induction therapy. Six patients had a complete response off therapy with an additional infusion of rituximab 6 months after initial treatment. Twenty patients experienced a total of 34 relapses; the time to relapse was 8 to 64 months. Every relapse was treated with rituximab (500 mg) without corticosteroids, which induced a new complete response. No serious adverse events were observed. Lack of a control group is a limitation. Rituximab therapy induces prolonged clinical remission in patients with pemphigus. Coadministration of other immunosuppressive agents is not necessary. Relapses can be managed with additional infusions administered on demand.

Use of Rituximab As a Pre-Emptive Therapy for Epstein-Barr Virus (EBV)-Associated Lymphoproliferative Disorders in 86 Adult Patients Having Allogeneic Stem Cell Transplantation

Abstract 1995 Background:Allogeneic stem cell transplantation may induce Epstein Barr Virus (EBV) reactivation. Some risk factors were identified. Despite the lack of guideline for treatment in such a situation, rituximab is commonly used. Objective: To assess the efficiency and tolerance of rituximab, we have conducted a retrospective study between 2005 and 2009 in the unit of transplantation. All the patients having allogenic transplantation with a viral load >500 copy/ml and receiving rituximab (375mg/m2/week) until negative viral load were included in this study. Earlier EBV reactivation was defined by occuring within 1 year after allogeneic transplantation. Results:86 patients had EBV-reactivation treated by rituximab. Median age was 49.5 years (39–58). Eighteen (21%) patients had a chronic B-cell malignancy. Thirty (35%) patients received myeloablative regimen, 56 (65%) had reduced intensity conditioning regimen. Graft were peripheral blood stem cells for 66 (77%) patients, bone marrow for 10 (11.5%) and cord blood for 10 (11.5%) patients. Forty-seven (68%) EBV-reactivations occurred with unrelated donor transplantation (MUD), and 30 (33.4%) concerned mismatched allografts. Twenty (23%) patients received anti-thymoglobulin (ATG), 38 (44%) received Fludarabine and 10 (12%) both. 30 (35%) patients reactivated another herpes virus in the same time. Seventy (82%) patients were in complete response or in very good partial response at the time of the reactivation.Most of the reactivations occurred before 1 year (90%, n=77) with a median day at D165 (5–1531). In 76 (88%) cases, couple recipient-donor had a positive EBV serology before allogenic transplantation and in 7 cases (8%), only the recipient was positive.The rate of complete response after rituximab was 82.5% (n=66). Relapse rate after the end of treatment was 45%. Two patients developed a post-transplant lymphoma disorder despite preemptive treatment. Use of ATG (OR 14.3 (4–51), EBV negative recipient serology (OR=7.5 (1.7-33.5), acute haematological malignancy or myelodysplastic syndrome versus chronic B-cell malignancies (OR 7 (2.1–22), and previous autologous transplantation (OR 14.7 (4.7-46.4) were poor prognosis factor for response to rituximab. The type of the disease, the type of the donor, the conditioning regimen, the type of match and chimerism, the use of ATG did not influence the time to response. Rituximab decreased the rate and the severity of acute Graft versus Host Disease (GvHD) (p<0.01). Rituximab did not modify CD4 and CD8 lymphocyte counts. NK cell number increased, starting at 6 months after the end of treatment, and B-lymphocytes from 6 months. Median overall survival (OS) was not reached at 2 years. There is a trend for a better survival in later EBV-reactivation than the earlier (p=0.08) one. In MUD allograft, EBV reactivation occurred statistically later than with sibling donor allograft (p=0.013). Conclusion:Rituximab is an efficient and safe pre-emptive therapy for EBV reactivation. Furthermore, the use of rituximab for EBV reactivation may support a positive effect for acute GvHD. Disclosures:No relevant conflicts of interest to declare.

Efficacy and Safety of Rituximab in Pediatric Neuromyelitis Optica

Neuromyelitis optica is a central nervous system disease characterized by optic neuritis and transverse myelitis. It is a devastating illness, and early treatment may prevent future relapses and severe disability. However, there is much variability in protocols used for treatment. In limited studies, rituximab has shown efficacy in adult neuromyelitis optica patients. There is a paucity of literature on the efficacy and tolerability of rituximab in the pediatric population. The authors report the use of rituximab in 2 pediatric patients with neuromyelitis optica, demonstrating its efficacy, dosing, and tolerability. This report may be a useful guide for administering rituximab safely in pediatric neuromyelitis optica patients.