This observation offers some confidence knowing that ChatGPT has certain knowledge that may be considered the fundamentals of science, common knowledge, or frequently studied associations; examples of such associations are the disease-drug association between diabetes mellitus and insulin, which was covered by 3000+ co-occurrences; the disease-gene association between breast cancer and ataxia telangiectasia mutated (ATM), where 9000 co-occurrences pointed to it that the ATM gene may cause the breast cancer. This evidence concerns the gene ATM and diabetes mellitus.