GPNMB and melanoma: Furthermore, WNT inhibition resulted in normalization of expression levels of the gene encoding the transmembrane Glycoprotein nmb (Gpnmb) (Figure 6E and F), a known marker of melanomas, gliomas and breast cancers, which is also overexpressed in TFE-fusion ccRCCs (Malouf et al., 2014; Zhou et al., 2012).