FDA OKs Enhertu Combo as First-Line for Advanced Breast Cancer
FDA has approved Daiichi Sankyo’s Enhertu (fam-trastuzumab deruxtecan-nxki) in combination with Genentech’s pertuzumab as a first-line treatment for adults with unresectable or metastatic HER2-positive breast cancer, expanding treatment options for patients with advanced disease. The approval covers patients whose tumors are HER2-positive — defined as immunohistochemistry 3+ or in situ hybridization+ — as determined by an FDA-approved test.
The decision is based on data from the Phase 3 DESTINY-Breast09 trial, a randomized, three-arm, global study involving 1,157 adults with advanced or metastatic HER2-positive breast cancer who had not previously received chemotherapy or HER2-targeted therapy for metastatic disease, or whose prior adjuvant or neoadjuvant HER2 therapy occurred more than six months earlier, according to an FDA release. Patients were assigned to receive Enhertu plus pertuzumab, a standard regimen of taxane chemotherapy with trastuzumab and pertuzumab (THP), or an investigational therapy.
Patients treated with the Enhertu–pertuzumab combination demonstrated a statistically significant improvement in progression-free survival compared with those receiving THP, FDA says. Median progression-free survival reached 40.7 months in the Enhertu combination arm, versus 26.9 months in the THP arm, representing a 44% reduction in the risk of disease progression or death. Confirmed objective response rates were also higher with the Enhertu combination, at 87%, compared with 81% for the standard regimen.