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JOURNAL ARTICLE
RESEARCH SUPPORT, NON-U.S. GOV'T
Polymorphisms in glutathione S-transferases are associated with altered risk of nonmelanoma skin cancer in renal transplant recipients: a preliminary analysis.
Journal of Investigative Dermatology 2001 August
Non-melanoma skin cancer (NMSC) represents a significant cause of morbidity and mortality among renal transplant recipients, with tumors behaving more aggressively than those in nontransplant patients. Not all immunosuppressed patients develop NMSC, however, and in those that do, the rate of accrual and numbers of lesions vary considerably. Though ultraviolet light is critical, it is unlikely that this alone explains the observed phenotypic diversity, suggesting the possible involvement of genetic factors. Furthermore, although twin studies in nontransplant patients with NMSC suggest a low genetic component, several genes associated with susceptibility and outcome in these patients have been identified. Thus, having previously shown that polymorphism in members of the glutathione S-transferase (GST) supergene family is associated with altered NMSC risk in nontransplant patients, we examined allelism in GSTM1, GSTP1, GSTM3, and GSTT1 in 183 renal transplant recipients. GSTM1 null was associated with increased squamous cell carcinoma (SCC) risk (p = 0.042, OR = 3.1). This remained significant after correction for age, gender, and ultraviolet light exposure (p = 0.012, OR = 8.4) and was particularly strong in patients with higher ultraviolet light exposure (e.g., sunbathing score > 3, p = 0.003, OR = 11.5) and in smokers (p = 0.021, OR = 4.8). Analysis of the interaction between GSTM1 null and sunbathing score showed that the two factors were synergistic and individuals with both risk parameters demonstrated a shorter time from transplantation to development of the first SCC (p = 0.012, hazard ratio = 7.1). GSTP1*Ile homozygotes developed larger numbers of SCC (p = 0.002, rate ratio = 7.6), particularly those with lower ultraviolet light exposure and cigarette consumption. GSTM3 and GSTT1 also demonstrated significant associations, though some genotype frequencies were low. These preliminary data suggest that genetic factors mediating protection against oxidative stress are important in NMSC development in immunosuppressed patients and may be useful in identifying high-risk individuals.
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