Kumar et al reported elevated levels of circulating MMP‐1, MMP‐2, MMP‐3, MMP‐7, MMP‐10 and MMP‐12 in TB patients having diabetes mellitus as compared to patients having TB only.47 Moreover, anti‐tuberculosis therapy with metformin was associated with a significant reduction in the levels of MMP expression. This evidence concerns the gene MMP12 and tuberculosis.