Increased risk of lymphoproliferative disorders in relatives of patients withB‐cell chronic lymphocytic leukemia: relevance of the degree of familial linkage

Abstract
We assessed the familial aggregation of chronic lymphoproliferative diseases (CLD) in 3962 relatives of 169 patients with B‐cell chronic lymphocytic leukemia (B‐CLL). Data collection included a self‐administered questionnaire. The “relative risk” considered the connection between a higher incidence of CLD and the degree of familial linkage with the probands. The model of logistic regression was statistically significant (p<0.001), with the probability of CLD increasing in proportion to the relationship coefficient between parents, siblings and children [(relationship coefficient 0.5; probability of CLD 1.85 (C.I. 95%, range 1.1–3%)]. CLD, particularly B‐CLL, were observed in first‐degree relatives of the patients with B‐CLL more often than in other relatives.

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