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    We investigated the association between skin rash and plasma creatine kinase (CK) levels in oncology phase I trials. We analysed data from 295 patients treated at our institution within 25 phase I trials which included CK measurements in the protocol. Trials involved drugs targeting EGFR/HER2, m-TOR, VEGFR, SRC/ABL, aurora kinase, BRAF/MEK, PARP, CDK, A5B1 integrin, as well as oncolytic viruses and vascular disrupting agents. Creatine kinase measurements were available for 278 patients. The highest levels of plasma CK during the trial were seen among patients with Grade (G) 2/3 rash (median 249 U l(-1)) compared with G1 (median 81 U l(-1)) and no rash (median 55 U l(-1)) (P<0.001). There was a significant reduction in CK after the rash resolved (mean 264.2 vs 100.1; P=0.012) in 25 patients, where serial CK values were available. In vitro exposure of human keratinocytes to EGFR, MEK and a PI3Kinase/m-TOR inhibitor led to the increased expression of CK-brain and not CK-muscle or mitochondrial-CK. Plasma CK elevation is associated with development of skin rash caused by novel anticancer agents. This should be studied further to characterise different isoforms as this will change the way we report adverse events in oncology phase I clinical trials.

    Citation

    V Moreno Garcia, P Thavasu, M Blanco Codesido, L R Molife, J Vitfell Pedersen, M Puglisi, B Basu, K Shah, J Iqbal, J S de Bono, S B Kaye, U Banerji. Association of creatine kinase and skin toxicity in phase I trials of anticancer agents. British journal of cancer. 2012 Nov 20;107(11):1797-800

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    PMID: 23099802

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