ICON8B: GCIG phase III randomised trial comparing weekly dose-dense chemotherapy + bevacizumab to three-weekly chemotherapy+ bevacizumab in first-line high-risk stage III-IV epithelial ovarian cancer treatment

Trial ID # ISRCTN10356387; ICON8B
Phase III
Drug Class Angiogenesis Inhibitors: VEGF
Drug Name Bevacizumab
Alternate Drug Names immunoglobulin G1 (human-mouse monoclonal rhuMab-VEGF gamma-chain, anti-VEGF monoclonal antibody, Avastin
Drugs in Trial Bevacizumab, Carboplatin, Paclitaxel
Eligible Participant

Newly diagnosed high-risk stage III/IV ovarian cancer

Patients Enrolled

707; 53% stage IIIC, 40% stage IV, 91% HGSOC. 14% PDS, 84% IDS, 2% no surgery

Therapy Setting

First-line

Study Design

Double Blind, Randomized

Endpoints

PFS, OS, evaluated per RECIST

Biomarkers

High risk: stage IIIA1(ii), stage IIIA2 with positive retroperitoneal lymph nodes >1cm in diameter, stage IIIB or IIIC disease with >1cm residual disease following immediate primary surgery (IPS) or those receiving primary chemotherapy with or without delayed primary surgery (DPS), and all stage IV disease

Efficacy

Standard of Care (SoC): CarboPt AUC5 or AUC6+Pac 175mg/m2 every 3 weeks+Bev
CarboPt q3w+Pac qw+Bev: CarboPt AUC5 or AUC6 every 3 weeks+Pac 80mg/m2 weekly+Bev

SoC+Bev (n=292) vs CarboPt q3w+Pac qw+Bev (n=286):

PFS: 16.7 vs 22.2 months, HR: 0.75 (0.62-0.90, p=0.002)
OS: 40.9 vs 51.1 months, HR: 0.77 (0.62-0.96, p = 0.02)

Clinically Significant Adverse Events

SoC+Bev vs CarboPt q3w+Pac qw+Bev:
Serious AE:
Grade 3-4 AE: overall (45 vs 58%)

Conclusion

In primary treatment of high-risk stage IIIC/IV ovarian cancer, bevacizumab with weekly taxol and carboplatin improves PFS and OS compared to bevacizumab with standard three weekly chemotherapy

Reference

Clamp A et al. ICON8B: GCIG phase III randomised trial comparing weekly dose-dense chemotherapy + bevacizumab to three-weekly chemotherapy+ bevacizumab in first-line high-risk stage III-IV epithelial ovarian cancer treatment: primary progression-free survival analysis. ESGO (2023) abstract 159
https://ijgc.bmj.com/content/33/Suppl_3/A424

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