Exelixis Announces Final Results from Phase 3 COSMIC-311 Pivotal Trial of CABOMETYX® in Patients with Previously Treated Radioactive Iodine-Refractory Differentiated Thyroid Cancer Presented at ESMO 2021
September 20, 2021 at 11:30 am EDT
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Exelixis, Inc. announced final results from the phase 3 COSMIC-311 pivotal trial of CABOMETYX® (cabozantinib) in patients with previously treated radioactive iodine-refractory differentiated thyroid cancer (DTC). Following a previous announcement that the trial met one of the two primary endpoints of significant improvement versus placebo in progression-free survival (PFS) assessed by blinded independent radiology committee (BIRC; p<0.0001), the results of the final analysis are being presented during the Mini Oral Session – NETs and Endocrine Tumours at 5:30 p.m. CEST on September 20 at the 2021 European Society of Medical Oncology (ESMO) Congress (LBA67). At a median follow-up of 10.1 months, the significant improvement in PFS with CABOMETYX was maintained, with consistent benefit in subgroups based on prior treatment. At a median follow-up of 10.1 months, CABOMETYX reduced the risk of disease progression or death versus placebo (hazard ratio [HR]: 0.22; 96% confidence interval [CI]: 0.15–0.32) in the intent-to-treat (ITT) population. Median PFS as assessed by BIRC was 11.0 months for patients treated with CABOMETYX (n=170) compared with 1.9 months for patients treated with placebo (n=88). Subgroup analyses demonstrated that CABOMETYX improved PFS versus placebo irrespective of prior exposure to lenvatinib and/or sorafenib: Prior sorafenib/no lenvatinib: median PFS was 16.6 months for patients treated with CABOMETYX (n=63) compared with 3.2 months for placebo (n=33) (HR: 0.13; 95% CI: 0.06–0.26). Prior lenvatinib/no sorafenib: median PFS was 5.8 months for patients treated with CABOMETYX (n=68) compared with 1.9 months for placebo (n=34) (HR: 0.28; 95% CI: 0.16–0.48). Prior sorafenib and lenvatinib: median PFS was 7.6 months for patients treated with CABOMETYX (n=39) compared with 1.9 months for placebo (n=21) (HR: 0.27; 95% CI: 0.13–0.54).
Exelixis, Inc. is an oncology company. The Company is engaged in developing medicines and combination regimens at the forefront of cancer care. It has produced four marketed pharmaceutical products, two of which are formulations of its flagship molecule, cabozantinib. Cabozantinib is an inhibitor of multiple tyrosine kinases, including MET, AXL, VEGF receptors and RET and has been also approved as CABOMETYX tablets for advanced renal cell carcinoma (RCC), for previously treated hepatocellular carcinoma (HCC) and for previously treated, radioactive iodine (RAI)-refractory differentiated thyroid cancer (DTC), and as COMETRIQ capsules for progressive, metastatic medullary thyroid cancer (MTC). The Company's other two products are COTELLIC, an inhibitor of MEK approved as part of multiple combination regimens to treat specific forms of advanced melanoma and MINNEBRO an oral, non-steroidal, selective blocker of the mineralocorticoid receptor (MR) approved the treatment of hypertension.
Exelixis Announces Final Results from Phase 3 COSMIC-311 Pivotal Trial of CABOMETYX® in Patients with Previously Treated Radioactive Iodine-Refractory Differentiated Thyroid Cancer Presented at ESMO 2021