PDPN and fibrosarcoma: Human podoplanin (hPDPN), also known as hT1α, hAggrus, or gp36, is expressed in many types of cancers, such as malignant brain tumors, malignant mesotheliomas, lung cancers, esophageal cancers, testicular tumors, bladder cancers, osteosarcomas, and fibrosarcomas 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15.