Audience: Oncologists, cardiologists, and other healthcare professionals[Posted 08/31/2005] Genentech and FDA notified healthcare professionals of updated cardiotoxicity information related to the use of Herceptin (trastuzumab), obtained from the National Surgical Adjuvant Breast and Bowel Project (NSABP) study (B-31), a randomized, Phase III trial that was conducted in 2043 women with operable, HER2 overexpressing breast cancer (IHC 3+ or FISH+). This study demonstrated a significant increase in cardiotoxicity in patients who were randomized to the Herceptin-containing arm as compared to patients who received chemotherapy alone.
Preliminary analysis of safety data from Study NSABP B-31 and the North Central Cancer Treatment Group (NCCTG) study (N9831) revealed a statistically significant increase in the 3-year cumulative incidence of New York Heart Association Class III and IV congestive heart failure and cardiac death observed in patients who received the Herceptin-containing regimen (4.1%) compared with control (0.8%). There were no cardiac deaths observed in patients who received the Herceptin-containing regimen and one cardiac death was observed in the control arm. Final analysis of the cardiac safety data collected in Studies NSABP B-31 and NCCTG N9831 is ongoing.