PCDH7 and breast carcinoma: Moreover, while PCDH7 expression was found to be upregulated in lung and breast cancer and associated with poor clinical outcome (Chen et al., 2016; Zhou et al., 2017), decreased PCDH7 expression was documented in bladder and gastric cancers that unfavorably impact patient survival (Beukers et al., 2013; Chen et al., 2017).