Interestingly, the 668R>Q SNP was in complete LD with a MMP9 promoter SNP, rs3918241 (D' = 1.0), where the variant A allele was positively associated with SLL/CLL (p = 1.0×10−2; q = 9.5×10−2; Tables 2, Table S2). This evidence concerns the gene MMP9 and B-cell chronic lymphocytic leukemia.