Other tumor markers included phosphatase and tensin homolog (PTEN, n = 5), platelet-derived growth factor receptor A (PDGFRA, n = 5), tumor protein 53 (TP53, n = 3), telomerase reverse transcriptase (TERT, n = 3), mouse double minute 2 (MDM2, n = 3), retinoblastoma protein 1 (RB1, n = 3), Ki (Kiel)-antigen Nr. This evidence concerns the gene RB1 and neoplasm.