In this study the endpoint, ε, is intestinal tumors in tumor-prone adenomatous-polyposis-coli APC(1638N/+) mice, and the data are tumor yields (number of tumors per mouse) after exposure to space-relevant doses of energetic 1H, 4He, 12C, 16O, 28Si, or 56Fe ions40. Here, APC is linked to intestinal neoplasm.