title: When to treat.
mesh_terms: D000818:Animals; D001683:Biological Clocks; D002940:Circadian Rhythm; D004351:Drug Resistance; D004358:Drug Therapy; D004361:Drug Tolerance; D006801:Humans; D009369:Neoplasms / Q000188:drug therapy / Q000532:radiotherapy; D010507:Periodicity; D011878:Radiotherapy; D013997:Time Factors