In that subgroup, PAC and age also correlated withMMP-9/TIMP-1 ratio (r = 0.57, p <0.001 and r = -0.37, P = 0.02, respectively), and,only in that subgroup, MMP-2 correlated with age (r = 0.42, p = 0.01). The gene discussed is MMP2; the disease is gonorrhea.