Pfizer’s Sutent Fails Colorectal Cancer Trial

Pfizer is discontinuing the SUN 1122 Phase III trial evaluating Sutent plus FOLFIRI (irinotecan plus infusional 5-fluorouracil and leucovorin) versus FOLFIRI alone for the first-line treatment of metastatic colorectal cancer (CRC). An independent Data Monitoring Committee found that the addition of Sutent to the chemotherapy regimen would be unable to demonstrate a statistically significant improvement in the primary endpoint of progression-free survival (PFS) compared to FOLFIRI alone. No new safety issues were identified.

“We are disappointed with this result, but trial successes and failures are an integral part of cancer drug development and contribute to a growing body of knowledge on improving patient care,” said Dr. Mace Rothenberg, senior vice president of Clinical Development and Medical Affairs for Pfizer’s Oncology Business Unit. “Pfizer remains committed to developing new agents for colorectal and other GI cancers with ongoing clinical studies evaluating other agents in its pipeline. Investigators will be consulted about the status of sunitinib colorectal studies other than the SUN 1122 trial. Pfizer also continues to study sunitinib in late-stage trials as a potential treatment for various other types of cancer.”

Sutent is currently approved for both gastrointestinal stromal tumor (GIST) after disease progression on or intolerance to imatinib mesylate, and advanced/metastatic renal cell carcinoma (RCC).