Children and adolescents with functional constipation showed significantly greater increases in spontaneous bowel movements with linaclotide compared with placebo, according to data from 330 individuals.
Functional constipation is prevalent in pediatrics and is associated with chronic burdensome symptoms and impaired quality of life with an unmet need for treatment options for this age group, corresponding study author Julie Khlevner, MD, AGAF, a pediatric gastroenterologist at Columbia University Vagelos College of Physicians and Surgeons, New York, said in an interview.
Linaclotide has been approved for adults with chronic idiopathic constipation and irritable bowel syndrome with constipation, but its efficacy and safety in pediatric patients were unknown. Therefore, evaluating its use in this population was crucial to provide evidence-based treatment option, she said.
In a study published in The Lancet Gastroenterology & Hepatology, the researchers randomized 166 pediatric patients with functional constipation to 72 micrograms of linaclotide once daily for 12 weeks and 164 to a placebo. The study was conducted at 64 clinic or hospital sites across 7 countries between October 1, 2019, and March 21, 2022. Approximately half (55%) of the patients were female.
The primary outcome was a change from baseline to 12 weeks in the frequency of spontaneous bowel movements (SBMs) per week, with no rescue medication on the day of or before the bowel movement. The secondary endpoint was change in stool consistency from baseline to 12 weeks. The mean frequency for SBMs at baseline was 1.16 per week in patients randomized to linaclotide and 1.28 for those randomized to placebo; these rates increased to 3.41 and 2.29, respectively, over the study period. The linaclotide patients showed a significantly greater improvement over placebo patients based on least-squares mean change from baseline (2.22 vs. 1.05, P = .0001).
In a subgroup analysis by age, the response was stronger in younger patients aged 6-11 years than in those aged 12-17 years, the researchers noted. This difference might stem from different pathophysiological mechanisms between older and younger ages, such as withholding behavior, they added.
Linaclotide was well tolerated overall; the most frequently reported treatment-emergent events were diarrhea (seven linaclotide patients and three placebo patients). In addition, five linaclotide patients and four placebo patients developed COVID-19 during treatment. No deaths occurred during the study, but one serious adverse event involving severe diarrhea, dehydration, and hospitalization, occurred in a 17-year-old female patient, but resolved after administration of intravenous fluids, the researchers noted.
The study findings reflect previous research on linaclotide in adults, Dr. Khlevner said. The significant improvement in spontaneous bowel movements frequency and stool consistency with linaclotide compared to placebo is consistent with its mechanism of action as a guanylate cyclase C agonist, she noted.
In clinical practice, barriers to the use of linaclotide may include lack of awareness of linaclotides safety and efficacy profile, and of its Food and Drug Administration approval for use in children aged 6-17 years with functional constipation, said Dr. Khlevner. Additionally, access to the medication and insurance coverage may be potential barriers for some patients. However, some of these barriers can be overcome through education and training of healthcare providers regarding the appropriate use of linaclotide in pediatric patients with functional constipation, she added.
The findings were limited by several factors including potential measurement bias and selection bias, lack of assessment of lifestyle modifications as confounding factors, and lack of quality-of-life assessment, the researchers noted. Other limitations included the relatively short 12-week treatment duration, which may not fully capture long-term safety and efficacy, and the focus on patients aged 6-17 years, Dr. Khlevner told this news organization.
Future research could address these limitations through longer-term studies with broader age ranges and incorporating patient-reported outcomes in real world situations to assess the overall impact of linaclotide treatment on pediatric patients with functional constipation, she said.
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Linaclotide Succeeds for Functional Constipation in Children | GI and Hepatology News - MDedge
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