PTGFRN and cancer: Recently, our laboratory has reported how the expression of PTGFRN was positively correlated with a metastatic phenotype in cancer cells using both mass spectrometric proteome analysis, as well as cell‐based functional assays by examining the phenotypic changes in cells where PTGFRN expression had been silenced by SiRNA transfection, and conversely by examining the cellular changes associated with PTGFRN expression [22, 23].