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World J Gastroenterol. 2007 Feb 14;13(6):912-5.

Use of probiotics for prevention of radiation-induced diarrhea.

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Institute of Radiology, Oncologic Radiotherapy Unit, Azienda Ospedaliera Universitaria, Messina, Italy.



To investigate the efficacy of a high-potency probiotic preparation on prevention of radiation-induced diarrhea in cancer patients.


This was a double-blind, placebo-controlled trial. Four hundred and ninety patients who underwent adjuvant postoperative radiation therapy after surgery for sigmoid, rectal, or cervical cancer were assigned to either the high-potency probiotic preparation VSL#3 (one sachet t.i.d.,) or placebo starting from the first day of radiation therapy. Efficacy endpoints were incidence and severity of radiation-induced diarrhea, daily number of bowel movements, and the time from the start of the study to the use of loperamide as rescue medication.


More placebo patients had radiation-induced diarrhea than VSL#3 patients (124 of 239 patients, 51.8%, and 77 of 243 patients, 31.6%; P<0.001) and more patients given placebo suffered grade 3 or 4 diarrhea compared with VSL#3 recipients (55.4% and 1.4%, P<0.001). Daily bowel movements were 14.7 +/- 6 and 5.1 +/- 3 among placebo and VSL#3 recipients (P<0.05), and the mean time to the use of loperamide was 86 +/- 6 h for placebo patients and 122 +/- 8 h for VSL#3 patients (P<0.001).


Probiotic lactic acid-producing bacteria are an easy, safe, and feasible approach to protect cancer patients against the risk of radiation-induced diarrhea.

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