Efficacy of Ondansetron in LARS Treatment

Ente Ospedaliero Cantonale, Bellinzona48 enrolled

Overview

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). It will be one week of washout between the two treatments. During the treatment questionnaires will be completed by the patients to evaluate the efficacy of the study treatment and the quality of live.

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.

Study Type

INTERVENTIONAL

Allocation

RANDOMIZED

Purpose

TREATMENT

Masking

QUADRUPLE

Enrollment

Conditions

Rectal Cancer

Interventions

Ondansetron 4 MGDRUG

Ondansetron is taken orally BD

PlaceboDRUG

Placebo is taken orally BD

Eligibility

Sex: ALLMin age: 18 Years

Medical Language ↔ Plain English

Inclusion Criteria: * Age ≥ 18 years * Patients willing and able to comply with the study procedures * Female patients of childbearing potential must agree to use a reliable method of contraception * Written informed consent Patients who have undergone low anterior resection (LAR) for rectal cancer in the last 2 years provided that at least 4 weeks have elapsed since recanalization and 4 weeks have elapsed since any chemo- and/or radiotherapy * Presence of functioning anastomosis * Presence of significant LARS symptoms assessed by LARS Score Exclusion Criteria: * Known hypersensitivity or allergy to Ondansetron * Previous Ondansetron antiemetic therapy completed less than 4 weeks before study entry * Antitumor chemotherapy or radiotherapy completed less than 4 weeks before study entry * Congenital long Q-T syndrome * Ongoing treatment with drugs causing prolongation of the Q-T interval * Uncorrected hypokalemia or hypomagnesemia * Women who are pregnant or breast feeding or are willing to become pregnant during the study * Clinically significant concomitant disease states or anastomotic complications which could impair the ability of the patient to participate in the trial * Inability to follow the procedures of the study, e.g. due to language problems, psychological disorders, dementia, etc.

Locations (2)

CHUV

Lausanne, Switzerland

Ospedale Regionale di Lugano, Civico e Italiano

Lugano, Switzerland

Outcomes

Primary Outcomes

Change in LARS score

The primary outcome is the change in LARS Score assessed before and after Ondansetron and placebo treatment

Time frame: 10 wks

Secondary Outcomes

Vaizey (St. Mark's) score

Change in Vaizey (St. Mark's) Score assessed before and at the end of Ondansetron and placebo treatment

Time frame: 10 wks

Irritable Bowel Syndrome-Quality of Life

Irritable Bowel Syndrome-Quality of Life (IBS-QoL) assessed before and at the end of Ondansetron and placebo treatment

Time frame: 10 wks

Data from ClinicalTrials.gov

This platform is for informational purposes only and does not constitute medical advice. Always consult a qualified healthcare professional.