In the tumor cell transfer model, the transferred tumor cells are B220 positive, CD19 positive, and CD45.2 positive but CD45.1 negative, while the host cells are B220 negative, CD19 negative, and CD45.2 negative but CD45.1 positive, as Rag1KO mice do not have any B or T cells. The gene discussed is PTPRC; the disease is neoplasm.