Exelixis IncZanzalintinib failed to show statistically significant OS benefit in key subgroup, creating uncertainty for FDA approval.

Shares of Exelixis fell 1.08% after the company announced that the final analysis of the STELLAR-303 study showed a non-statistically significant trend in overall survival favoring zanzalintinib plus Roche's Tecentriq in the subgroup of metastatic colorectal cancer patients without active liver metastases. Median overall survival was 15.9 months for the combination versus 12.7 months for regorafenib. The phase III trial had previously met its other dual primary endpoint of overall survival in the intent-to-treat population. The disappointing subgroup result creates uncertainty for the U.S. new drug application under review, with a target action date of December 3, 2026.
Exelixis IncZanzalintinib failed to show statistically significant OS benefit in key subgroup, creating uncertainty for FDA approval.
Merck & Company Inc
Natera Inc
Roche Holding AG