Besides our results highlighting the role of MST and CDO1 in cysteine metabolism, the correlations observed between CBS and CTH with other genes encoding enzymes and transporters support the role of CBS and CSE on cancer biology disclosed in other studies [45,46,94,95,96], as we also verified in our H2S detection assays using A549 and H292 cell lines (Figure 1). The gene discussed is MPST; the disease is cancer.