KLK10 expression is downregulated in breast, prostate, testicular, and lung cancer (Goyal et al., 1998; Liu et al., 1996; Hu et al., 2015; Luo et al., 2001; Zhang et al., 2010) but overexpressed in ovarian, pancreatic, and uterine cancer (Luo et al., 2003; Yousef et al., 2005; Dorn et al., 2013; Tailor et al., 2018). The gene discussed is KLK10; the disease is lung cancer.