PLIN3 and undifferentiated (embryonal) sarcoma: PLIN3 expression was seen in all epithelioid sarcomas (8/8), in most dermatofibrosarcoma protuberans (31/38), undifferentiated sarcomas (25/34), fibrosarcomas (16/18), Ewing's sarcomas (11/17), and in a few rhabdomyosarcomas (5/22) and leiomyosarcomas (12/42).