Basal-cell carcinoma
In the United States approximately 3 out of 10 caucasians develop a basal-cell carcinoma during their lifetime. This tumor accounts for approximately 70% of non-melanoma skin cancers. In 80 percent of all cases, basal-cell carcinoma affects the skin of head and neck. Furthermore, there appears to be an increase in the incidence of basal-cell cancer of the trunk in recent years.
Squamous-cell carcinoma of the lung
Currently, four variants (papillary, small-cell, clear-cell, and basaloid) of squamous-cell carcinoma of the lung are recognized. Of these variants, there is some evidence that the basaloid and poorly differentiated small-cell variants may have worse prognoses than "conventional" squamous-cell carcinomas. The papillary variant occurs more frequently as a primarily superficial, endobronchial lesion, with a modestly better prognosis Very little data is currently available on the clear-cell variant of squamous-cell carcinoma, and no consensus has been reached on the prognostic implications of clear-cell changes in lung cancer.