Associations between ultraviolet radiation, basal cell carcinoma site and histology, host characteristics, and rate of development of further tumors.

Background: Patients with basal cell carcinoma (BCC) frequently develop further tumors during follow-up.

Objective: We sought to elucidate the relative effects of pattern of ultraviolet radiation exposure, and site and histologic type of the first tumor, on the rate of increase in BCC numbers.

Methods: We used negative binomial regression analysis to study the association of selected variables on the rate of increase in BCC numbers in 266 Caucasian patients who first presented with a tumor on the head/neck or trunk with nodular or superficial histology.

PTCH polymorphism is associated with the rate of increase in basal cell carcinoma numbers during follow-up: preliminary data on the influence of an exon 12-exon 23 haplotype.

After first presentation with a basal cell carcinoma (BCC), patients demonstrate interindividual diversity in the rate of development of further BCCs (number/year of follow-up). The mechanism for this variation is unknown. In this study, we evaluated whether PTCH variants mediate this phenomenon.

Associations between UVR exposure and basal cell carcinoma site and histology.

While sunlight is critical in basal cell carcinoma (BCC) pathogenesis the relationship between exposure and tumor site and histology is unclear. We determined if tumor site (trunk or head/neck) or histology (nodular or superficial) is determined by exposure pattern. In 66 cases with truncal and 362 patients with head/neck BCC at first presentation, average hours exposure/year, intermittency score, childhood sunburning and skin type were not significantly associated with tumor site or histology.

Polymorphisms in glutathione S-transferases and non-melanoma skin cancer risk in Australian renal transplant recipients.

Caucasian renal transplant recipients from Queensland, Australia have the highest non-melanoma skin cancer (NMSC) risk worldwide. Although ultraviolet light (UVR) exposure is critical, genetic factors also appear important. We and others have shown that polymorphism in the glutathione S-transferases (GST) is associated with NMSC in UK recipients.

Combined effects of gender, skin type and polymorphic genes on clinical phenotype: use of rate of increase in numbers of basal cell carcinomas as a model system.

Patients with a basal cell carcinomas (BCC) have an increased risk of further tumors. We studied the individual and combined impact of gender, skin type and allelic genes cytochrome P450 (CYP2D6), vitamin D receptor (VDR), tumor necrosis factor-alpha, TNF-alpha) on the rate of increase in BCC numbers after first presentation. Individually, male gender, skin type 1, CYP2D6 EM, VDR TT and TNF-alpha GG were associated with more BCC/year (rate ratio (RR) 1.