Summary
A study was made of 32 monkeys which survived one to seven years after total body exposure to protons or to high-energy X rays. Among these 32 monkeys there were 21 which survived two years or longer after exposure to 200 to 800 rad. Glioblastoma multiforme developed in 3 of the 10 monkeys surviving three to five years after receiving 600 or 800 rad 55-MeV protons. Thus, the incidence of tumor development in the present series was far higher than the incidence of spontaneously developing brain tumors in monkeys cited in the literature. This suggests that the tumors in the present series may have been radiation-induced.
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Haymaker, W., Rubinstein, L.J. & Miquel, J. Brain tumors in irradiated monkeys. Acta Neuropathol 20, 267–277 (1972). https://doi.org/10.1007/BF00691745
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DOI: https://doi.org/10.1007/BF00691745