Efficacy of Ondansetron in LARS Treatment

Summary

Participation Requirements

Description

This is a multi-centre randomized, double-blind, placebo-controlled, cross-over study aimed at testing the efficacy of Ondansetron in the low anterior resection syndrome (LARS) occurring as a consequence of surgery for rectal cancer. Patients will be randomized (1:1 ratio) to receive either 4 weeks ...

This is a multi-centre randomized, double-blind, placebo-controlled, cross-over study aimed at testing the efficacy of Ondansetron in the low anterior resection syndrome (LARS) occurring as a consequence of surgery for rectal cancer. Patients will be randomized (1:1 ratio) to receive either 4 weeks of Ondansetron followed by 4 weeks of placebo (O-P sequence) or 4 weeks of placebo followed by 4 weeks of Ondansetron (P-O sequence). Neither the investigator nor the patient will be aware of the sequence (O-P or P-O) assigned to the patient. One week will elapse between the end of the first treatment and start of the second treatment. The hypothesis to be tested is that 4 weeks of oral Ondansetron at the dose of 4mg BID induce a variation of the LARS Score at least 7 points (20%) greater than the variation occurring after 4 weeks of placebo. The sample size calculated for the primary analysis is 38 evaluable patients. Considering an expected attrition rate of about 20%, it is expected to enrol approximately 46 patients in total.

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