MMP9 and gonorrhea: Haplotype analysis of 6 tag SNPs did not find significant association of MMP9 with overall PAC/PACG (P > 0.11; S2 Table), or the subgroups (P > 0.05 and 0.16 for PAC and PACG respectively, S2 Table; P > 0.09 and 0.08 for acute and chronic PAC/PACG respectively; S3 Table).