この研究は、900 MHzのGSM無線通信信号へのばく露が、低用量DMBAにより誘発された乳腺腫瘍の発症および増殖を増強するかどうかを調べた。500匹の雌Sprague-Dawleyラットを35 mg / kg DMBAの単回投与で処理した後、ブラインド法で5群に分けた：1つのケージ対照群、4つのばく露群（3つのGSMばく露群（SARが4.0、1.33、0.44 W / kg）と1つの擬似ばく露群（SARが0 W / kg））。ばく露は、DMBA投与の翌日から開始し、1日4時間、週5日、26週間継続した。毎週、ラットの体重測定、腫瘍の存在を確認するための触診を行い、ばく露終了直後に屠殺して、すべての乳腺を組織学的に検査した。その結果、擬似ばく露群とGSMばく露群の間に体重の有意差はなかった；擬似ばく露群とGSMばく露群の間に、全乳腺腫瘍の発生率、腫瘍発症までの潜時、腫瘍の多様性、または腫瘍サイズに有意差はなかった；擬似ばく露群に比べ、最低レベルばく露群（0.44 W / kg）では乳腺腺がんの発生率が低い傾向性が見られた（P = 0.058）；腺がんの高めの発生率が、ばく露の15週目から26週目までの4.0 W / kg群で見られ、特に19週目で高かったが、どちらの傾向も統計学的に有意ではなかった；したがって、この研究は、GSMマイクロ波ばく露がラットの乳腺腫瘍発生を促進するという証拠を提供していない、と報告している。
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500 rats were treated with a single dose of 35 mg/kg DMBA and exposure started on the day after DMBA administration.
This study was a parallel project to one part of the PERFORM-A program (International EMF project launched by WHO).
|repeated daily exposure, 4 h/day, 5 days/week, for 26 weeks
|The rats where exposed in 12 air-conditioned radial exposure units called wheels, each holding 17 rats. Each week, the exposure positions of each rat on the wheel were rotated one position to the right.
|The exposure wheel consisted of a circular cascade of 17 sectored waveguides, all of which were excited by one quarter-loop antenna located in the center and providing uniform circular excitation. The rats were restrained in a horizontal position in metal-free polycarbonate tubes inside the waveguide cavity ventilated from the front where the head of the rat was located.
|A sham exposure was conducted.
|Exposure was based on a novel concept using H-polarization to provide reasonable homogeneity of exposure for rats of different sizes.
No significant differences in overall mammary tumor incidence, latency to tumor onset, tumor multiplicity, or tumor size were revealed between exposed and sham exposed groups. Additionally, there were no statistically significant differences in body weight.
There was a tendency for reduction of mammary adenocarcinoma incidence in the lowest exposure group (0.44 W/ kg) compared with the sham exposed rats. Additionally, a higher incidence of adenocarcinoma was noticed in the 4.0 W/kg animals from the 15th to 26th weeks. However, neither tendency was statistically significant; thus this study does not provide evidence that GSM microwave exposure promotes mammary tumor development in rats.
There were significant differences between the cage controls and the experimental groups (sham exposure and exposure). Body weight and mammary tumor incidence in the cage control animals were significantly higher than in the sham exposed and exposed rats. The latency to the mammary tumor onset was significantly shorter in the cage control animals than in the other animals.