Physician-based case-control study of non-melanoma skin cancer in Baytown, Texas.

A physician-based case-control study of non-melanoma skin cancer was conducted to test the hypothesis that employment in the petroleum industry increased the risk of basal cell carcinoma (BCC), squamous cell carcinoma (SCC), or both (BCC+SCC). Other potential risk factors were also investigated. There were 174 cases of BCC, 59 cases of SCC, 72 cases of both and 229 controls completing a self-administered questionnaire. The most important risk factors common to all skin cancer categories were a family history of skin cancer and time spent outdoors. Employment in the petroleum industry showed a slight association with BCC+SCC, but only in the multivariate model. Further study is needed to evaluate whether this association is causal, or due to chance, bias or confounding.