SLC20A1 and osteosarcoma: Interestingly, GALV was superior to AMLV (PiT-1 > PiT-2) in mesothelioma, whereas AMLV was superior to GALV (PiT-1 < PiT-2) in osteosarcoma, as in GC, although the biological relevance of the differential expression between PiT-1 and PiT-2 in these tumor cells is unclear.