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HCC was induced in <jats:italic>Per2<\/jats:italic>::<jats:italic>luc<\/jats:italic> mice which were irradiated at four time points of the day. Proliferation and DNA\u2010double strand breaks were analyzed in irradiated and nonirradiated animals by detection of Ki67 and \u03b3\u2010H2AX. Prior to whole animal experiments, organotypic slice cultures were investigated to determine the dosage to be used in whole animal experiments. Irradiation was most effective at the proliferation peaks in HCC at ZT02 (early inactivity phase) and ZT20 (late activity phase). Irradiation effects on NTL were minimal at ZT20. As compared with NTL, nonirradiated HCC revealed disruption in daily variation and downregulation of all investigated clock genes except <jats:italic>Per1<\/jats:italic>. Irradiation affected rhythmic clock gene expression in NTL and HCC at all ZTs except at ZT20 (late activity phase). Irradiation at ZT20 had no effect on total leukocyte numbers. Our results indicate ZT20 as the optimal time point for irradiation of HCC in mice at which the ratio between efficacy of tumor treatment and toxic side effects was maximal. Translational studies are now needed to evaluate whether the late activity phase is the optimal time point for irradiation of HCC in man.<\/jats:p>","DOI":"10.1002\/cam4.4277","type":"journal-article","created":{"date-parts":[[2021,9,21]],"date-time":"2021-09-21T06:12:33Z","timestamp":1632204753000},"page":"7712-7725","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":15,"title":["Does timing matter in radiotherapy of hepatocellular carcinoma? 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