Platinum-resistant Recurrent Ovarian Cancer Research Articles

The efficacy, safety, and beneficiary population of angiogenesis inhibitor apatinib plus chemotherapy in recurrent platinum-resistant ovarian cancer patients: A comparative cohort study.

Angiogenesis inhibitor apatinib targets vascular endothelial growth factor receptors and improves the outcomes of patients with gynecologic malignancy. This study aimed to evaluate the efficacy and safety of angiogenesis inhibitor apatinib plus chemotherapy in recurrent platinum-resistant ovarian cancer (RPR-OC) patients. This study retrieved 67 RPR-OC patients who received apatinib plus chemotherapy or chemotherapy alone and divided them into apatinib + chemo (N = 30) and chemo alone (N = 37) groups according to the actual medication. Objective response rate (36.7% vs. 16.2%, p = 0.056) and disease control rate (80.0% vs. 59.5%, p = 0.072) showed an increased trend in apatinib + chemo group versus chemo alone group. The progression-free survival (PFS) (p = 0.010) and overall survival (OS) (p = 0.042) were prolonged in apatinib + chemo group versus chemo alone group. The median (95%confidence interval [CI]) PFS was 5.9 (5.5-6.3) months in apatinib + chemo group and 3.8 (2.0-5.6) months in chemo alone group. The median (95%CI) OS was 20.5 (16.5-24.5) months in apatinib + chemo group and 13.6 (8.6-18.6) months in chemo alone group. Apatinib plus chemotherapy was independently related with better PFS (hazard ratio [HR]: 0.354, p < 0.001) and OS (HR: 0.116, p < 0.001). Subgroup analyses indicated that patients with a more serious disease condition might benefit more from apatinib plus chemotherapy. No difference was found in adverse events of all grade or grade ≥3 between the two groups (all p > 0.05). Angiogenesis inhibitor apatinib plus chemotherapy shows better treatment efficacy than chemotherapy alone with controllable safety profile in RPR-OC patients.

Comparison of target agent treatment strategies for platinum-resistant recurrent ovarian cancer: A Bayesian network meta-analysis.

We aimed to compare 7 newer immunotherapies and targeted therapies for platinum-resistant relapsed ovarian cancer. We conducted a comprehensive search of PubMed, EMBASE, and Cochrane Library electronic databases for phase III trials involving platinum-resistant recurrent ovarian cancer (PRrOC) patients treated with immunotherapy or targeted therapy in combination with chemotherapy. The quality of the included trials was assessed using the GRADE method. The primary outcome of comparison was progression-free survival, and secondary outcomes included overall survival and safety. This analysis included 7 randomized phase III controlled trials, encompassing 2485 PRrOC patients. Combining bevacizumab plus chemotherapy and lurbinectedin demonstrated statistically significant differences in progression-free survival compared to all other regimens of interest. However, no statistically significant differences were observed in the overall survival. Nivolumab and mirvetuximab exhibited fewer serious adverse events than the other regimens of interest. Our findings indicate that bevacizumab combined with chemotherapy and lurbinectedin monotherapy has significant efficacy in patients with PRrOC. For patients with PRrOC who have exhausted treatment options, nivolumab and mirvetuximab may be considered as alternatives because of their better safety profiles.

Phase 1b study of batiraxcept in combination with durvalumab in patients with platinum-resistant ovarian cancer

Combining an immune checkpoint inhibitor with batiraxcept (AVB-S6-500), an AXL inhibitor that acts via selective binding to growth arrest-specific protein 6 (GAS6), may improve anti-tumor immunity in platinum-resistant ovarian cancer (PROC). This phase 1b trial of durvalumab in combination with escalating doses of batiraxcept enrolled patients with recurrent PROC (NCT04019288). The primary objective was to determine the toxicity profile of the combination. Eleven patients were enrolled on the trial. No dose-limiting toxicities were observed, and no objective responses were noted. Median progression free survival (PFS) was 1.81months (95% confidence interval (CI) 1.71-2.40), and median overall survival (OS) was 4.53months (95% CI 2.10-24.74). Batiraxcept effectively reduced serum GAS6 levels at 1-h post-treatment, resulting in trough levels below the limit of detection in all cases but one. In conclusion, the combination of batiraxcept and durvalumab was safe and tolerable but did not demonstrate anti-tumor activity in a heterogenous population of patients with recurrent PROC.

Biomarker-driven targeted therapy in patients with recurrent platinum-resistant epithelial ovarian cancer (BRIGHT): protocol for an open-label, multicenter, umbrella study.

Platinum-resistant, recurrent ovarian cancer has an abysmal prognosis with limited treatment options. Poly-(ADP-ribose)-polymerase (PARP), angiogenesis, and immune checkpoint inhibitors might improve the outcomes of platinum-resistant, recurrent ovarian cancer, but accurate patient selections for those therapies remain a significant clinical challenge. To evaluate the efficacy and safety of biomarker-driven combinatorial therapies of pamiparib, tislelizumab, bevacizumab, and nab-paclitaxel in platinum-resistant, recurrent ovarian cancer. A precision medicine combination of PARP inhibitors, anti-angiogenic therapy, immunotherapy, and chemotherapy will improve disease outcomes of platinum-resistant, recurrent ovarian cancer by accounting for genomic and immunologic features. The BRIGHT Trial is a prospective, open-label, multicenter, phase II, umbrella study planning to enroll 160 patients with serous, endometrioid, or clear cell platinum-resistant, recurrent ovarian cancer from 11 clinical centers in China. Patients are assigned to one of three experimental arms based on biomarkers. Patients with BRCA1/2 mutations will receive pamiparib plus bevacizumab (arm 1, n=40) regardless of CD8+ tumor-infiltrating lymphocytes count. Patients with wild-type BRCA1/2 (BRCAwt) and ≥3 CD8+ tumor-infiltrating lymphocytes count will receive the combination of tislelizumab, bevacizumab, and nab-paclitaxel (arm 2, n=50), while BRCAwt patients with <3 CD8+ tumor-infiltrating lymphocytes count will receive bevacizumab plus dose-dense nab-paclitaxel (arm 3, n=50). After completing patient enrollment in arm 2, another 20 BRCAwt patients with ≥3 CD8+ tumor-infiltrating lymphocytes count will be included as an arm 2 expansion. Treatment will continue until disease progression or intolerable toxicity, and all adverse events will be recorded. Eligible patients include those aged ≥18 with serous, endometrioid, or clear cell ovarian cancer, platinum-resistant recurrence, and Eastern Cooperative Oncology Group (ECOG) performance status of 0 or 1. Objective response rate (ORR) assessed by the investigators by the RECIST 1.1 criteria. 160 patients. Recruitment is estimated to be completed by 2024 and results may be published by 2027. ClinicalTrials.gov: NCT05044871.

Platinum- and Non-Platinum-Based Chemotherapy in Patients with Recurrent Platinum-Resistant Ovarian Cancer: A Review Article

Platinum- and Non-Platinum-Based Chemotherapy in Patients with Recurrent Platinum-Resistant Ovarian Cancer: A Review Article

Cost-effectiveness and drug wastage of bevacizumab biosimilar with or without chemotherapy for platinum-resistant recurrent ovarian cancer

ABSTRACT Introduction The cost-effectiveness of adding bevacizumab biosimilar with or without chemotherapy (CT) and drug wastage in treating platinum-resistant recurrent ovarian cancer (PRrOC) was assessed. Methods A three-state partitioned-survival model to compare the clinical and economic outcomes in the treatment of patients with PRrOC from a Taiwan healthcare prospective, extrapolated to two years based on data obtained from the JGOG3023 clinical trial. The primary outcomes of the model were incremental cost-effectiveness ratios (ICERs). Results In the base-case scenario, using vials of bevacizumab biosimilar (Bevbiol) plus chemotherapy, the ICER was (new Taiwan dollar) NT$ 4,555,878 per QALY gained. The incremental cost savings of an incremental 2.02 QALYs were NT$ 1,605,828 if weight-based Bevbiol plus chemotherapy were used, but the ICER remained high at the willingness-to-pay (WTP) threshold. If the cost of Bevbiol were reduced to 50% per vial, adding it to CT would be cost-effective at an acceptable WTP threshold of NTD 2,994,200, with an ICER of NT$ 2,975,484. Conclusions Bevacizumab biosimilars in mg/kg dosage form with chemotherapy are still not cost-effective in Taiwan, but using weight-based dosing will reduce drug waste and save treatment costs.

Mirvetuximab soravtansine in platinum-resistant recurrent ovarian cancer with high folate receptor-alpha expression: a cost-effectiveness analysis.

Mirvetuximab soravtansine (MIRV), a new antibody-drug conjugate, versus the investigator's choice of chemotherapy (IC) was the first treatment to demonstrate benefits for progression-free and overall survival in platinum-resistant recurrent ovarian cancer (PROC) with high folate receptor-alpha (high-FRα) expression. Efficacy, safety, and economic effectiveness make MIRV the new standard of care for these patients. Based on patients and clinical parameters from MIRASOL (GOG 3045/ENGOT-ov55) phase III randomized controlled trials, the Markov model with a 20-year time horizon was established to evaluate the cost and efficacy of MIRV and IC for PROC with high-FRα expression, considering the bevacizumab-pretreated situation from the American healthcare system. Total cost, life-years (LYs), quality-adjusted life-years (QALYs), incremental cost-effectiveness ratio (ICER), and incremental net health benefits were the main outcome indicators and compared with willingness-to-pay threshold of $100,000/QALY. Sensitivity and scenario analyses were conducted. Compared with the IC, MIRV was associated with incremental costs of $538,251, $575,674, and $188,248 with the corresponding QALYs (LYs) increased by 0.90 (1.55), 1.09 (1.88), and 0.53 (0.79), leading to ICERs of $596,189/QALY ($347,995/LY), $530,061/QALY ($306,894/LY), and $1,011,310/QALY ($680,025/LY) in the overall, bevacizumab-naïve, and bevacizumab-pretreated patients, respectively. When MIRV is reduced by more than 75%, it may be a cost-effective treatment. At the current price, MIRV for PROC with high-FRα expression is not the cost-effective strategy in the US. However, its treatment has higher health benefits in bevacizumab-naïve patients, which is likely to be an alternative.

Cytoreductive surgery is feasible in patients with limited regional platinum-resistant recurrent ovarian cancer

IntroductionTo evaluate the efficacy of cytoreductive surgery versus chemotherapy for the treatment of limited regional, platinum-resistant ovarian cancer (PROC).Materials and methodsThe clinical records of all patients with PROC treated in our center between March 2015 and March 2022 were retrospectively reviewed. We compared the oncology outcomes of patients who received cytoreduction or chemotherapy alone at relapse and presented information about postoperative adjuvant chemotherapy.ResultsAmong 52 patients with limited regional recurrence, 40.4% (21/52) underwent cytoreduction because of platinum resistance, and 59.6% (31/52) received chemotherapy alone. No residual disease (R0) was achieved in 20 patients (95.2%). The severe morbidity rate within 30 days after the surgery was 15%. The median follow-up was 70.6 months. Compared with the chemotherapy alone group, the surgery group with R0 had better progression-free survival (PFS) (10.6 vs. 5.1 months; hazard ratio (HR) = 0.421; P = 0.0035) and post-relapse survival (PRS) (32.6 vs. 16.3 months; HR = 0.478; P = 0.047), but there was no difference in overall survival (OS) between the two groups. Laparoscopy is associated with lesser intraoperative blood loss with no differences in survival and postoperative complications compared to the open approach (P = 0.0042). Subgroup survival analysis showed that compared with chemotherapy alone, surgery prolonged PFS in patients regardless of tumor size (greater than or equal to 4 cm or less). Surgery group patients who achieved R0 had an objective response rate (ORR) of 36.8% (7/19), among whom 40% (4/10) received platinum rechallenge chemotherapy and 33.3% (3/9) were administered non-platinum chemotherapy.ConclusionWhen well-selected PROC patients with limited regional recurrence achieved R0, their outcomes were superior to those of patients who received only chemotherapy with an acceptable morbidity rate. Laparoscope technology could be a reliable alternative surgical approach. The reintroduction of platinum agents may be considered following surgery. Further analyses in a larger population are warranted to elucidate the risks and benefits of this surgery and adjuvant chemotherapy strategy.

Niraparib and dostarlimab for the treatment of recurrent platinum-resistant ovarian cancer: results of a Phase II study (MOONSTONE/GOG-3032)

ObjectiveThis study assessed the efficacy, safety, and health-related quality of life (HRQoL) of the treatment regimen of dostarlimab, a programmed death-1 inhibitor, combined with niraparib, a poly (ADP-ribose) polymerase inhibitor, in patients with BRCA wild type (BRCAwt) recurrent platinum-resistant ovarian cancer (PROC) who had previously received bevacizumab treatment. MethodsThis Phase II, open-label, single-arm, multicenter study, conducted in the USA, enrolled patients with recurrent PROC to receive niraparib and dostarlimab until disease progression or unacceptable toxicity (up to 3 years). A preplanned interim futility analysis was performed after the first 41 patients had undergone ≥1 radiographic evaluation (approximately 9 weeks from the first treatment). ResultsThe prespecified interim futility criterion was met and the study was therefore terminated. For the 41 patients assessed, the objective response rate (ORR) was 7.3% (95% confidence interval: 1.5–19.9); no patients achieved a complete response, 3 patients (7.3%) achieved a partial response (duration of response; 3.0, 3.8, and 9.2 months, respectively), and 9 patients (22.0%) had stable disease. In total, 39 patients (95.1%) experienced a treatment-related adverse event, but no new safety issues were observed. HRQoL, assessed using FOSI, or Functional Assessment of Cancer Therapy – Ovarian Symptom Index scores, worsened over time compared with baseline scores. ConclusionsThe study was terminated due to the observed ORR at the interim futility analysis. This highlights a need for effective therapies in treating patients with recurrent BRCAwt PROC.

Efficacy, safety and pharmacokinetics of apatinib plus etoposide versus apatinib alone for platinum-resistant recurrent ovarian cancer: protocol of a multicenter, open-label, randomized phase 2 trial

Efficacy, safety and pharmacokinetics of apatinib plus etoposide versus apatinib alone for platinum-resistant recurrent ovarian cancer: protocol of a multicenter, open-label, randomized phase 2 trial

Efficacy of pembrolizumab in combination with bevacizumab and oral metronomic cyclophosphamide in the treatment of platinum resistant recurrent ovarian cancer: A retrospective observational study (2180)

Efficacy of pembrolizumab in combination with bevacizumab and oral metronomic cyclophosphamide in the treatment of platinum resistant recurrent ovarian cancer: A retrospective observational study (2180)

Updated survival and safety results from the phase 2 study (ANNIE) of anlotinib and niraparib dual therapy evaluation in platinum-resistant recurrent ovarian cancer (1139)

Updated survival and safety results from the phase 2 study (ANNIE) of anlotinib and niraparib dual therapy evaluation in platinum-resistant recurrent ovarian cancer (1139)

Clinical trial participation is associated with improved overall survival in women with recurrent platinum resistant epithelial ovarian cancer (003)

Clinical trial participation is associated with improved overall survival in women with recurrent platinum resistant epithelial ovarian cancer (003)

Prognostic factors of survival in women with recurrent platinum-resistant epithelial ovarian cancer (1171)

Prognostic factors of survival in women with recurrent platinum-resistant epithelial ovarian cancer (1171)

Association of Clinical Trial Participation With Improved Overall Survival for Recurrent, Platinum-Resistant Ovarian Cancer.

To investigate whether clinical trial participation is associated with overall survival in patients with platinum-resistant ovarian cancer. An IRB-approved, retrospective, single-institution cohort study was performed in patients with platinum-resistant ovarian cancer from January 1, 2009, to December 31, 2017. Platinum resistance was defined as progression within 6 months after completion of platinum chemotherapy. Patients were divided into two cohorts: 1) clinical trial participants for platinum-resistant ovarian cancer or 2) standard of care. The association of trial participation with overall survival from the date of platinum resistance was assessed with univariate and multivariable models. Of 305 eligible patients with recurrent platinum-resistant ovarian cancer, 46 (15.1%) were clinical trial participants. There were no significant differences in age (61.2 years vs 63.3 years, P =.21), body mass index (27.5 vs 27.6, P =.90), race ( P =.61), medical comorbidities ( P >.05), or performance status ( P =.07) for clinical trial participants compared with those receiving standard of care. The majority underwent primary cytoreduction (76.1% vs 69.1%, P =.34) with no differences in residual disease ( P =.43) for clinical trial participants compared with those receiving standard of care. There was no difference in poly-ADP-ribose polymerase inhibitor (21.7% vs 15.1%, P =.26) or bevacizumab (22.2% vs 32.1%, P =.31) use for clinical trial participants compared with those receiving standard of care. On multivariable analysis controlling for comorbidities, stage, and germline mutational status, clinical trial participation was associated with significantly improved overall survival from the date of platinum resistance compared with standard of care (13.8 months vs 10.5 months, adjusted hazard ratio 1.46, 95% CI 1.04-2.05, P =.028). In this retrospective cohort of patients with platinum-resistant ovarian cancer, clinical trial participation was associated with improved overall survival compared with standard of care therapies. Availability and participation in clinical trials should be prioritized in patients with recurrent, platinum-resistant ovarian cancer.

Effects of the baseline prognostic factors on efficacy of the p62/SQSTM1-encoding plasmid combined with gemcitabine in patients with recurrent platinum-resistant ovarian cancer.

e17540 Background: We recently reported on the efficacy of the p62/SQTM1-encoding plasmid in patients with advanced, recurrent platinum-resistant ovarian cancer (PROC) receiving gemcitabine chemotherapy. Here we analyze the effects of baseline prognostic factors on efficacy. Methods: A prospective multicenter randomized study took place between 01/2020 and 08/2023. Cohort A (n=20) consisted of Gemcitabine 1000 mg/m2 days 1,8 every 3 weeks and Cohort B (n=20) consisted of Gemcitabine (Gem) 1000 mg/m2 days 1,8 every 3 weeks plus p62-plasmid 2.5 mg i.m. weekly. We stratified the patients into subgroups according to their baseline CA-125 level (normal vs high), number of lines of chemo (1 vs 2-3) received by a platinum-sensitive ovarian cancer (PSOC) patient before they became PROC, platinum-free interval (PFI) (up to 3 mo vs more than 3 mo), and presence or absence of peritoneal effusion. Cox proportional hazards regression analysis was utilized to determine effect of progression free survival (PFS). Results: The median follow-up was 13.8 months (mos). The median PFS was 2.8 mos in Gem (Arm A) and 7.2 mos in Gem + Plasmid (Arm B) respectively (p = 0.03). The overall response rate (ORR) by RESIST 1.1 was higher in the Gem +Plasmid arm: partial response (PR) - 5.0% and 20.0%, stable disease (SD) - 40.0% and 60.0%, and disease control rate 41.2 and 80% in Chemo and Plasmid arms respectively). In cohort A, all patients have progressed, whereas in Cohort B (Gem +Plasmid) 9 patients (45%) remained progression-free with the longest duration of response being 30 mo. Overall survival cannot be assessed yet. Analyzing prognostic factors with Cox Proportional Hazards Regression Analysis identified that the following factors increase p62 sensitivity: initial high CA-125 level PFS 2.5 and 6.5 (p = 0.01) in Arm A vs B, 1 line chemo vs 2 or 3 lines for PSOC, PFS 2.3 and 7.1 (p = 0.008) in Arm A vs B, and presence of peritoneal effusion PFS 2.4 and 7.6 (p = 0.008) in Arm A vs B (Table ). Conclusions: We observed maximal effect on PFS when combining the p62-encoding plasmid with Gem in the patients with the most dismal prognosis PROC: rapid progression (relapse as PROC after the first line of treatment and/or short PFI), in patients with an initial high level of CA-125, and/or pleural effusion. [Table: see text]

Randomized controlled phase III trial of weekly paclitaxel ± ofranergene obadenovec (VB-111) for platinum-resistant ovarian cancer (OVAL Study/GOG 3018).

5505 Background: Ofranergene obadenovec (ofra-vec, VB-111) is a nonreplicating adenoviral vector with a murine pro-endothelin 1 (PPE-1-3X) promoter and pro-apoptotic Fas-tumor necrosis factor receptor 1 (TNFR1) chimeric transgene thought to have a dual mechanism of action: vascular disruption and immune activation. Methods: This is a randomized, placebo-controlled, double-blind, multi-center randomized phase III trial (ClinicalTrials.gov identifier: NCT03398655) of ofranergene obadenovec combined with paclitaxel vs paclitaxel with placebo for the treatment of patients with recurrent platinum resistant ovarian cancer (PROC). Patients were randomly assigned 1:1 to receive IV VB-111 1x1013 viral particles (VPs) every 8 weeks with weekly IV paclitaxel 80 mg/m2 or placebo with paclitaxel until disease progression. The dual primary endpoints were overall survival (OS) and progression free survival (PFS) as assessed by Blinded Independent Central Review (BICR). Results: Between December 2017 and March 2022, 409 patients were randomized at 86 clinical sites in US, Israel, Spain, Poland and Japan. The median PFS was 5.29 months in the VB-111 arm and 5.36 months in the control arm; hazard ratio (HR) 1.03 (CI: 0.83-1.29, p = 0.7823), and median OS with was 13.37 months vs. 13.14 months HR 0.97 (CI: 0.75–1.27 p = 0.8440). Objective response rates (ORR) were similar in both arms: RECIST 1.1 ORR was 28.9% with VB-111 vs. 29.6% with control (CA-125 ORR 41.1% vs 49.4%). In both treatment arms response to CA-125 was a substantial prognostic factor for both PFS and OS. In the VB-111 arm, the HR in CA-125 responders compared to non-responders was for PFS HR 0.2428 (CI: 0.1642-0.3588), and for OS HR 0.3343 (CI: 0.2134-0.5238). Safety profile was consistent with the known safety profile of ofra-vec and was characterized by common transient flu like symptoms such as fever and chills. Conclusions: The addition of ofranergene obadenovec to paclitaxel did not improve PFS or OS. Clinical trial information: NCT03398655 .

A phase 1 study of the SYK inhibitor fostamatinib and weekly paclitaxel for recurrent platinum-resistant ovarian cancer.

5574 Background: Response to chemotherapy in patients (pts) with recurrent platinum-resistant ovarian cancer (PROC) is generally &lt; 15%. Spleen tyrosine kinase (SYK) is overexpressed in PROC and is a key mediator of paclitaxel resistance in ovarian cancer cells. Fostamatinib (Fos), an orally available inhibitor of SYK, is currently FDA approved for the treatment of idiopathic thrombocytopenic purpura. The active form of Fos (R406) was shown to synergistically enhance taxane-mediated cytotoxicity in preclinical ovarian cancer models. This phase 1 study aimed to identify the maximum tolerated dose (MTD) and recommended phase 2 dose (RP2D) of Fos when combined with standard weekly paclitaxel (wPac) for pts with PROC. Methods: Pts with PROC, defined as progression ≤6 months of last platinum, were eligible. A modified toxicity probability interval (mTPI) dose escalation design was used to determine the MTD/RP2D and response was assessed using RECISTv1.1 criteria. All pts received paclitaxel (wPac) 80mg/m2 intravenously on Days 1, 8, and 15, of a 28-day cycle. Fos was administered orally twice a day (BID) on a continuous schedule. Three dose levels (DL) were planned: DL1 - 100mg, DL2 - 150mg, and DL3 - 200mg. MTD was determined based on cycle 1 dose-limiting toxicities (DLTs) and responses were assessed every 2 cycles. A dose expansion cohort to further assess adverse events (AEs) and tolerability was performed. Results: 27 eligible pts, median age 62 years (range 35-79 years) with high-grade serous (n = 18), clear cell (n = 4), carcinosarcoma (n = 3), or other (n = 2) histology were treated at 3 centers. Twelve pts were treated in the dose escalation cohort (DL1 = 6, DL2 = 3, DL3 = 3). Common AEs at least possibly attributed to Fos, wPac, or both included diarrhea (70%), fatigue (52%), anemia (44%), neutropenia (33%), nausea (33%), hypertension (30%), and dysgeusia (30%). Treatment-emergent grade 3-4 AEs were neutropenia (37%), anemia (26%), and thromboembolic event (22%). During DL1, updated toxicity management guidelines not consistent with the original protocol were released and 2 of the 3 pts treated prior to the amendment were not considered evaluable for DLT. Thus 3 more pts were enrolled to DL1 after the amendment. Of the 10 pts evaluable for DLT in dose escalation, no DLTs were reported on any of the 3 DLs (DL1 = 4, DL2 = 3, DL3 = 3). DL3 was selected for dose expansion. One of 15 pts in the dose expansion cohort had a DLT (neutropenia) and one patient had a grade 5 infection. Of 18 pts treated at DL3, 7 (39%) had partial or complete response (95% CI: 17.3, 64.3%). Overall, 27 patients received a median of 3 cycles (range 0-10). Analysis of pharmacokinetic and correlative molecular studies of target expression are ongoing. Conclusions: The RP2D of Fos will be 200 mg orally BID when combined with wPac. AE profile of the combination was as expected and the combination demonstrated promising efficacy in pts with recurrent PROC. Clinical trial information: NCT03246074 .

Cost-effective analysis of rotational intraperitoneal aerosol chemotherapy (RIPAC) in patients with platinum-resistant ovarian cancer.

e17585 Background: We developed RIPAC, which improves distribution and penetration compared to pressurized intraperitoneal aerosol chemotherapy (PIPAC). To introduce this newly developed device in the real world, we analyzed the cost-effectiveness of rotational intraperitoneal aerosol chemotherapy (RIPAC) device to improve quality of life (QoL) compared to conventional palliative chemotherapy for platinum-resistant ovarian cancer patients. Methods: A decision tree was designed to compare the quality-adjusted life year (QALY) and cost consisting of RIPAC and palliative chemotherapy regimens, such as pegylated liposomal doxorubicin (PLD), gemcitabine (GEM), and topotecan (TOP). Also, to reflect the clinician’s variable preferred regimens for palliative chemotherapy, the average direct and indirect medical costs of belotecan, docetaxel, vinorelbine, and vinblastine were also considered in addition to the three regimens (ANY). The model included quality of life which was measured by European Organization for Research and Treatment of Cancer (EORTC)-Quality of life Questionnaire 30 (QLQ-C30) data gathered from previous clinical trial reports on PIPAC and palliative chemotherapy for recurrent ovarian cancer willingness-to-pay (WTP) threshold was set at US$40,000 per quality-adjusted life year saved. Results: To complete three cycles of palliative chemotherapy using PLD, GEM, TOP, and ANY, the total medical costs were US$15,267, US$9,013, US$16,144, and US$12,631, respectively, and the corresponding QALYs for each regimen were 0.633, 0.553, 0.783, and 0.65. Since RIPAC has not yet been introduced into the medical market, when the maximum RIPAC cost is calculated from ANY considering WTP, the cost of RIPAC excluding the ward, outpatient, and anesthesia-related costs among direct medical costs was estimated to be up to US$4,391. Conclusions: The cost-effective analysis results for the palliative treatment of recurrent ovarian cancer implied that RIPAC could be a cost-effective strategy to improve the QoL of platinum-resistant recurrent ovarian cancer patients.

Macrophages Phenotype Regulated by IL-6 Are Associated with the Prognosis of Platinum-Resistant Serous Ovarian Cancer: Integrated Analysis of Clinical Trial and Omics.

The treatment of platinum-resistant recurrent ovarian cancer (PROC) is a clinical challenge and a hot topic. Tumor microenvironment (TME) as a key factor promoting ovarian cancer progression. Macrophage is a component of TME, and it has been reported that macrophage phenotype is related to the development of PROC. However, the mechanism underlying macrophage polarization and whether macrophage phenotype can be used as a prognostic indicator of PROC remains unclear. We used ESTIMATE to calculate the number of immune and stromal components in high-grade serous ovarian cancer (HGSOC) cases from The Cancer Genome Atlas database. The differential expression genes (DEGs) were analyzed via protein-protein interaction network, Kyoto Encyclopedia of Genes and Genomes (KEGG) and gene ontology (GO) analysis to reveal major pathways of DEGs. CD80 was selected for survival analysis. IL-6 was selected for gene set enrichment analysis (GSEA). A subsequent cohort study was performed to confirm the correlation of IL-6 expression with macrophage phenotype in peripheral blood and to explore the clinical utility of macrophage phenotype for the prognosis of PROC patients. A total of 993 intersecting genes were identified as candidates for further survival analysis. Further analysis revealed that CD80 expression was positively correlated with the survival of HGSOC patients. The results of GO and KEGG analysis suggested that macrophage polarization could be regulated via chemokine pathway and cytokine-cytokine receptor interaction. GSEA showed that the genes were mainly enriched in IL-6-STAT-3. Correlation analysis for the proportion of tumor infiltration macrophages revealed that M2 was correlated with IL-6. The results of a cohort study demonstrated that the regulation of macrophage phenotype by IL-6 is bidirectional. The high M1% was a protective factor for progression-free survival. Thus, the macrophage phenotype is a prognostic indicator in PROC patients, possibly via a hyperactive IL-6-related pathway, providing an additional clue for the therapeutic intervention of PROC.