BCR and B-cell chronic lymphocytic leukemia: In contrast, m-GS1 was enriched for older men, BCR IG subset 2 (FDR = 2.96 × 10−6) and IGHV3-21 (FDR = 7.50 × 10−9) (Supplementary Fig. 6b), although most patients in m-GS1 did not have any defined CLL stereotype.