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Probiotics for Rectal Volume Variation During Radiation Therapy for Prostate Cancer

Menée sur 40 patients atteints d'un cancer de la prostate traité par tomothérapie, cette étude analyse l'intérêt de la bactérie Lactobacillus acidophilus pour réduire le changement de volume du rectum et, par voie de conséquence, de position de la prostate durant les séances de radiothérapie

To investigate the effect of the probiotic Lactobacillus acidophilus on the percentage volume change of the rectum (PVCR), a crucial factor of prostate movement. Prostate cancer patients managed with tomotherapy as a radical treatment were enrolled in the study to take a probiotic capsule containing 1.0 × 108 colony-forming units of L acidophilus or a placebo capsule twice daily. Radiation therapy was performed at a dose of 78 Gy in 39 fractions. The PVCR, defined as the difference in rectal volume between the planning computed tomographic (CT) and daily megavoltage CT images, was analyzed. Forty patients were randomized into 2 groups. The L acidophilus group showed significantly lower median rectal volume and median PVCR values than the placebo group. L acidophilus showed a significant reduction effect on the PVCR (P<.001). However, the radiation therapy fraction number did not significantly influence the PVCR. L acidophilus was useful in reducing the PVCR, which is the most important determining factor of prostate position, during radiation therapy for prostate cancer.

International Journal of Radiation Oncology, Biology, Physics

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