In addition, GARP mRNA can be detected in many tissues, e.g., heart, kidney, liver, and lung, whereas surface expression of the GARP protein itself seems to be limited to only a number of cell types, e.g., activated regulatory T cells [59], platelets [60], various cancers like GB and malignant melanoma [7,39], and mesenchymal stem cells [61], further contributing to a decreasing validity. This evidence concerns the gene LRRC32 and cancer.