Multiple Primary Neoplasms in Blacks Compared to Whites. II. Further Cancers in Patients With Cancer of the Buccal Cavity and Pharynx2

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Abstract
Incidence of multiple primary neoplasms in patients with an index cancer of the buccal cavity and pharynx was determined from 23 years' experience of the Charity Hospital Tumor Registry. Expected cancers were calculated by the application of age-, sex-, and racespecific incidence rates to the person-years experience in the registry; these rates were compared to observed cancers. White males with primary cancers of the lip and mouth had a significantly increased risk of developing further cancer of the skin and lung. Black males with primary cancer of the salivary gland had a threefold increased risk which was accounted for by subsequent cancer of the lung and prostate. Black males with primary cancer of the mouth had a threefold increased risk, which was explained by subsequent additional cancers of the buccal cavity and pharynx and lung. The fivefold increased risk among black males with primary cancer of the pharynx was accounted for by subsequent cancers of the esophagus, lung, and prostate. White females with cancer of the lip and mouth had an increased risk of further skin cancer. Black females had no increased risk for subsequent cancers.

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