In contrast to what was observed in Atm−/− background (Fig. 2a, b), loss of functional TDP2 did not significantly decrease lifespan (Fig. 2e), nor increase the high incidence of cancer (Supplementary Fig. 2e), and thymic lymphoma in particular (Fig. 2f), observed in Trp53−/− animals. The gene discussed is ATM; the disease is thymus lymphoma.