MPST and cancer: Our previous research has shown that in brain cancer and neuroblastoma cells, the increase in MPST activity by a sulfane sulfur donor (diallyl trisulfide) [11] and L-cysteine precursors (N-acetylcysteine, D-ribose-L-cysteine) [13,14] is associated with an increase in intracellular sulfane sulfur level and inhibition of proliferation of cancer cells.