H2AX and neoplasm: Studies have shown contrasting results, with Gerelchuluun et al. demonstrating a significantly increase in γ-H2AX levels in human tumor cell lines ONS76 and MOLT4, 30 min after 2 Gy irradiation with 200 MeV of proton compared with 10 MV of X-ray irradiation (ONS76: p = 0.006; MOLT4: p = 0.025)32.