PLPPR1 has been shown to be downregulated in breast cancer (Bao et al., 2019) and in glioblastoma tissue (Aaberg-Jessen et al., 2018); in the latter, both up- and downregulated PLPPR1 levels are associated with shorter survival of glioblastoma patients (Fan et al., 2016). This evidence concerns the gene PLPPR1 and breast cancer.