Family history of breast and ovarian cancer among breast-cancer patients in the Connecticut Tumor Registry.

Using the database of the population-based Connecticut Tumor Registry (CTR), along with the supplemental data obtained from Connecticut hospitals, 111 cases reporting one or more first-degree relatives with breast and/or ovarian cancer were identified among 1,077 incident female breast-cancer patients diagnosed at age <60 years in 1992. Stage at diagnosis and histology for invasive cancers did not differ between 99 family history-positive cases and 320 cases with no family history of any cancer. The CTR could be useful in clinical and epidemiologic studies involving inherited susceptibility to breast-cancer.