CAF markers that have been associated with promotion of breast cancer tumor growth through several experiments include α-SMA, FAP, PDGFR-α, PDGFR-β, CD29, neural/glial antigen 2 (NG2), FSP1, vimentin, and podoplanin (PDPN) [36,37,86]. The gene discussed is PDPN; the disease is breast cancer.