PLA2G2A and neoplasm: Remarkably, after receiving DMBA/TPA, skin tumor development was markedly lower in Pla2g2a−/− mice than in Pla2g2a+/+ mice in the cohousing (–) group (Figure 1, B and C), whereas cohoused Pla2g2a+/+ and Pla2g2a−/− mice displayed low tumor susceptibility, similar to the response seen in single-housed Pla2g2a−/− mice (Figure 3, A and B).