PDGFRA and Kaposi's sarcoma: The upregulation of KSHV lytic genes in K-Pα(+)S KS tumors correlated with PDFGRA signaling activation (Fig 2D) and phospho-PDGFRA co-distributed with KSHV LANA (Fig 2E), further supporting our investigated link between KSHV and PDGFRA activation in mouse-KS tumors [14].