MAGEA4 and osteosarcoma: In conclusion, we report MAGE‐A1, MAGE‐A4, NY‐ESO‐1, PRAME, and KK‐LC‐1 expression within osteosarcoma, liposarcoma, leiomyosarcoma, chondrosarcoma, and undifferentiated pleomorphic sarcoma using immunohistochemistry and MI chip.