Whole exome sequencing in families with CLL detects a variant in Integrin β 2 associated with disease susceptibility.

To the editor: Chronic lymphocytic leukemia (CLL) is one of the most common B-cell malignancies in individuals of European ancestry in the United States.[1][1] Although advanced age, white ancestry, and family history of hematologic malignancies are risk factors, the etiology of CLL is unknown.[2][