Methylcobalamin Halves Severe Hand-Foot Syndrome During Capecitabine Therapy
A multicentre phase 3 RCT in 234 women with HER2-negative early breast cancer showed that oral methylcobalamin reduced grade 2 or higher hand-foot syndrome from 29% to 15% during adjuvant capecitabine treatment, with no additional safety concerns. The finding offers a simple, inexpensive supportive-care intervention that may help maintain chemotherapy dose intensity.
The original study
Effect of methylcobalamin on capecitabine induced hand-foot syndrome in patients with HER2 negative early breast cancer: multicentre, double blind, randomised, placebo controlled, phase 3 trial.
- Authors
- Xia Y, Zhu Y, Ling L, Xu F, Yang Y, Ye J, et al.
- Journal
- BMJ (Clinical research ed.)
- Type
- Journal Article, Randomized Controlled Trial, Clinical Trial, Phase III, Multicenter Study
- PMID
- 40935571
Original abstract
OBJECTIVE: To evaluate whether methylcobalamin could effectively and safely prevent hand-foot syndrome in patients with human epidermal growth factor receptor 2 (HER2) negative early breast cancer receiving adjuvant capecitabine treatment. DESIGN: Multicentre, double blind, randomised, placebo controlled, phase 3 trial. SETTING: Seven hospitals in China between January 2022 and February 2024. PARTICIPANTS: Women aged 18-75 years with pathologically confirmed HER2 negative early breast cancer who were scheduled to receive adjuvant capecitabine treatment. INTERVENTIONS: Eligible patients were randomly assigned in a 1:1 ratio to receive methylcobalamin at a dose of 0.5 mg orally, three times daily, or a placebo for a maximum of 24 weeks. MAIN OUTCOME MEASURES: The primary endpoint was the incidence of grade ≥2 hand-foot syndrome occurring for the first time during capecitabine treatment in the intention-to-treat analysis. RESULTS: 234 patients were randomly assigned to receive methylcobalamin (n=117) or placebo (n=117) and were included in the intention-to-treat and safety analysis. Grade ≥2 hand-foot syndrome occurred in 17 (14.5%) of 117 patients in the methylcobalamin group and 34 (29.1%) of 117 patients in the placebo group (risk difference -14.5%, 95% confidence interval -24.9% to -4.1%; one sided P value=0.003). The rate of reduction or discontinuation of capecitabine treatment because of hand-foot syndrome was 7.7% (9 of 117) in the methylcobalamin group and 13.7% (16 of 117) in the placebo group (risk difference -6.0%, 95% confidence interval -13.9% to 1.9%). The two groups showed similar incidence of any other adverse events (88 (75.2%) in the methylcobalamin group and 95 (81.2%) in the placebo group). No methylcobalamin specific adverse events were observed. CONCLUSIONS: Oral methylcobalamin significantly lowered the severity of hand-foot syndrome by reducing the incidence of grade ≥2 symptoms without unexpected safety concerns in women with HER2 negative early breast cancer who were receiving adjuvant capecitabine treatment. The findings support the use of methylcobalamin to prevent capecitabine associated severe hand-foot syndrome in this patient population. TRIAL REGISTRATION: ClinicalTrials.gov NCT05165069.