Median number of cycles completed was 3 (0-13): 1/25 (4%) pts had a partial response, 11/25 (44%) had stable disease, 12/25 (48%) had progression of disease, and 1/25 (4%) was not evaluable for response. PFS was 2.6 months (95% CI [2.56-5.26]). The median OS was 17.4 months (95% CI [10.3, NA])....Neratinib is safe in older adults with HER2 positive or HER2 mutated MBC.