Thus, p53−/− mice developed thymic lymphomas (66%), high-grade sarcomas (26%), B cell lymphomas (8%), as well as occasional adenocarcinomas (4%), teratocarcinomas (4%), mesothelioma, and medulloblastoma (Fig. 1D and Table 1). The gene discussed is TP53; the disease is B-cell non-Hodgkin lymphoma.