of these patients 50.9 % had multiple myeloma , 18.1 % had nonmyelomatous malignant diseases such as macroglobulinemia , lymphoma , leukemia or cancer , 4.3 % had connective tissue diseases , 2.5 % had primary generalized amyloidosis ( pga ) and the rest had various `` '' benign '' '' conditions .
C0026764
multiple myeloma
C0268381
primary