TP53 and neoplasm: One interesting result in these analyses was that the 3 month p53 deleted mice had a significant delay in median tumor incidence relative to germline p53−/− mice (p = 1.24×10−7), whereas the 6 and 12 month homozygous deletion incidence curves were not significantly different from germline p53−/− mice (p = 0.987 and 0.247, respectively).