The p21 level of colon cancer tissue was the lowest (cancer, 10.122 vs. normal, 11.050), followed by lung cancer (cancer, 10.204 vs. normal 10.543) and breast cancer (cancer, 9.550 vs. normal 9.667) with log2 (transcripts per million, TPM). The gene discussed is CDKN1A; the disease is colonic neoplasm.