RISK OF KIDNEY CANCER AND OTHER 2ND SOLID MALIGNANCIES IN PATIENTS WITH CHRONIC LYMPHOCYTIC-LEUKEMIA

Patients with chronic lymphocytic leukemia (CLL) are known to to have an increased incidence of secondary cancers. We investigated the occur rence of secondary cancers in 7391 patients with CLL diagnosed between 1955 and 1988. The observed number of cancer cases was compared with the expected number of cancers calculated from national cancer inciden ce rates. The overall risk of cancer was significantly increased among persons with CLL. The standardized incidence ratios (ratio between th e observed and the expected numbers) were 2.0 for men and 1.2 for wome n. Increased risks were found for cancer of the lung and prostate in m en (RR = 2.0 and 1.5 respectively), renal parenchyma in both sexes (RR = 2.8 for men, RR = 3.6 for women) non-melanoma skin cancer in both s exes (RR = 4.7 for men, RR = 2.4 for women) and sarcomas (RR = 3.3 for men, RR = 2.8 for women). Although an increased risk of cancer is to be expected solely because individuals with CLL are being physically e xamined frequently, it appears that the risk is significantly increase d for a number of cancer sites in persons with CLL.