ERBB2 and neoplasm: The median tumor/disease-free survival (DFS) for the MMTV-neu mice was 197 days (n = 25), but it was significantly extended in MDTG;neu mice to 216 days (from strain 76; n = 18, p = 0.0002), 223 days (from strain 79; n = 16, p<0.0001), and 211 days (from strain 138, n = 19; p = 0.0003).