Tumor growth data from 26 MMTV-Hras/p53+/+ tumors (16 from males and 10 from females), 34 MMTV-Hras/p53-/- tumors (21 from males and 13 from females), and 39 MMTV-Hras/p53R172H/R172H tumors (35 from males and 4 from females) was obtained. The gene discussed is HRAS; the disease is neoplasm.