CLOCK and cancer: The references are grouped into 20 clusters, such as #0 cancer patient, #1 cancer therapeutics, #2 major role, #3 intestinal stem cell, #4 personalized treatment, #5 circadian disruption, #6 healthy clock, #7 chronopharmacological aspect, #8 rat model, #9 tumor suppressor, #10 cancer biology, #11 advanced cancer, #12 rest circadian rhythm, #13 alcohol-associated dysbiosis, #14 colorectal cancer, #15 light pollution, #16 therapy, #17 determining chemotherapeutic toxicity, #18 beta-catenin pathway, and #19 pharmacogenomic interaction.