Consistent with the tumour data ApcMin/+, K-ras+/+ and ApcMin/+, K-rastmΔ4A/tmΔ4A mice exhibited similar survival (Figure 3) for both males (χ21 = 1.91, P = 0.167) and females (χ21 = 0.44, P = 0.506). The gene discussed is KRAS; the disease is neoplasm.