“…17 In lung cancer patients, the specificity of MMP-9 was 72.67%, the sensitivity was 90.00%, and the cutoff value was 0.584. 110 Schweiger et al 111 detected the positive expression of MMP-9 in 17 blood samples (85.0%) and 15 tumor samples (75.0%). Among 20 NSCLC patients, 19 patients were in stages I and II, so the expression of MMP-9 in the lung is a highly regulated process.…”