この研究は、ニトロソメチル尿素によるラットの乳腺腫瘍誘導に対する低周波磁界および静磁界の影響を調べた。その結果、静磁界および交流磁界へのばく露期間に依存して、腫瘍発生率が高まった；交流磁界の方が静磁界より、乳腺ガン誘発の頻度が高かった、と報告している。
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To investigate the effects of low frequency electromagnetic fileds on mammary carcinoma in rat induced by N-nitrosomethylurea (NMU).
Rats were kept under normal light conditions (i.e. 12 h light/ 12 h dark) and were exposed either to static or to variable magnetic fields (MF). Exposure conditions were chosen 0.5 and 3 h per day, respectively for a time periode of 2 years. One part of the animals recived a single intravenously injection of 50 mg/kg of the chemical carcinogen NMU. None-NMU-treated and none-exposed animals served as control.
Without prior administration of NMU, magnetic filed exposure lead only to a week development of mammary carcinomas. Incidence and latent period of mammary tumors depend on duration and kind of the magnetic field exposure. A 3 h exposure and exposure with variable magnetic field were more effective than a 0.5 h exposure and exposure with static magnetic fields, respectively. Beside prevailed mammary adenocarcinomas neoplasms were found occassionaly in kidneys, ovary, large intestine, uterus and thyroid gland.
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