QSOX1 and cancer: In many cases, ST expression levels increase in cancer (Pietrobono & Stecca, 2021), but it is possible that these enzymes are also activated post‐translationally, since increased QSOX1 expression is seen in many cancer types (Antwi et al, 2009; Soloviev et al, 2013; Knutsvik et al, 2016; Baek et al, 2018; Sung et al, 2018).