SLC52A3 and neoplasm: Bela Ozsvari et al reported that diphenyleneiodonium, an inhibitor of riboflavin, can eliminate CSCs in tumours and promote cells in a state of metabolic‐quiescence or ‘suspended animation’.33 In this study, we examined the riboflavin content and the gene and protein expression of RFT2, which is the main riboflavin transporter; it is the central core during the transfer process of riboflavin.17, 34 The mRNA and protein expression of RFT2 in CSCs was significantly higher than in NON‐CSCs.