We then analyzed genomic DNA from 162 AML , 30 B cell lymphoma , and 10 chronic lymphocytic leukemia ( CLL ) samples for JAK 2 mutations , and assayed a subset for SOCS 1 and FLT 3 mutations . ^^^ FLT 3 mutations were present in 5 / 32 ( 16 % ) , while SOCS 1 mutations were totally absent . ^^^