RCHY1 and sarcoma: Monitoring of cohorts of Pirh2 mutant mice indicated that in addition to plasma cell hyperplasia and kidney failure, approximately 25% of Pirh2−/− and 17% of Pirh2+/− sick mice developed solid tumors including sarcomas, liver, testes, mammary and lung tumors (Figure 8C and 8D, Figure S8A–S8D and Table S1).