“…These drugs arc known to be capable of causing malignancy in their own right [31]. However, this was not the case in sev eral reported patients with both tumors, including the present patient where the two tumors were discovered simultane ously [3,5,6,7,9], In all other reported cases the CLL antedated multiple myeloma [1,2,4,8,10]. Immune suppres sion, a common finding in both CLL and multiple myeloma, may be accompanied by diminished immunosurveillancc which may predispose to the development of a second tumor [10].…”