DDAH1 and cancer: More recently, a study has shown that DDAH1 can inhibit the renal fibrosis process via the Wnt/β‐catenin pathway (Liu et al., 2016), a well‐established crucial signaling event associated with a number of human diseases (Miao et al., 2013; Miki et al., 2011; de Sousa et al., 2011) including cancer (Ramachandran et al., 2012).