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Presentation with Multiple Cutaneous Basal Cell Carcinomas: Association of Glutathione S-Transferase and Cytochrome P450 Genotypes with Clinical Phenotype¹

Clinical Biochemistry Research Laboratory, School of Postgraduate Medicine, Keele University [S. R., A. A. F., R. C. S.], and Department of Dermatology [J. T. L., H. R., A. G. S.], North Staffordshire Hospital, Stoke-on-Trent ST4 7PA, Staffordshire; Department of Dermatology, Royal Cornwall Hospitals, Truro TR1 2HZ, Cornwall [B. B.]; Department of Dermatology, Leicester Royal Infirmary, Leicester LE1 5WW [P. E. H.]; and Department of Mathematics, Keele University, Staffordshire ST5 5BG [P. W. J.], England

We previously reported associations between numbers of basal cell carcinomas (BCCs) and glutathione S-transferase (GSTM1 and GSTT1) and cytochrome P450 (CYP2D6) genotypes. Thus, although GSTM1 AB is protective, GSTM1 null, GSTT1 null, and CYP2D6 EM are associated with increased numbers of lesions. Here, we examine the hypothesis that these genotypes are associated with high-risk subgroups. The subgroup studied comprised 119 patients with more than one previously unidentified BCC at first or later presentations [multiple presentation phenotype (MPP)]. These patients were part of a group of 773 BCC patients that also included 567 patients with one BCC and 87 patients with only one lesion at each presentation [single presentation phenotype (SPP)] but who developed multiple BCCs. The number of tumors in the MPP was significantly greater than that in the SPP groups. In the MPP but not SPP patients, GSTM1 AB, GSTT1 null, and CYP2D6 EM were significantly associated with BCC numbers, suggesting that previously observed associations reflect the influence of these genes only in the MPP cases. There was no evidence that MPP patients had received more UV exposure. We also determined whether the increased numbers of BCC in the MPP cases reflects an association with the truncal tumor phenotype. The values of the rate ratios indicated that the MPP is a marker for the risk of many BCCs, although the combination of MPP and a truncal tumor is a higher-risk phenotype. The data demonstrate the heterogeneity in BCC patients, which reflects differences in genetic factors that determine skin response to UV.

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