Subsequent studies that investigated the prognostic role of MMP9 rs2250889 in 200 nasopharyngeal carcinoma patients showed increased death risk (HR = 2.287, 95% CI = 1.400–3.735) in subjects with MMP9 rs2250889 encoded p.574Pro/Pro and p.574Pro/Arg genotypes compared to p.574Arg/Arg genotype [28]. This evidence concerns the gene MMP9 and nasopharyngeal carcinoma.