QSOX1 and lung cancer: QSOX1is an enzyme that oxidizes thiols during protein folding, reducing molecular oxygen to hydrogen peroxide, which may be utilized by tumour cells at different stages of tumorigenesis.39 The results of Sung et al40 have proven that QSOX1 might be a lung cancer tissue‐derived biomarker and be involved in the promotion of lung cancers, and thus can be a therapeutic target for lung cancers