ArticleObesity pillars2026
Clinical-genetic predisposition and medium-term outcomes after bariatric surgery: A 5-year validation of the OBEGEN score.
Article in Obesity pillars, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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Abstract
Background: Weight-loss outcomes after bariatric surgery (BS) show interindividual variability that is not fully explained by clinical factors. In the OBEGEN study we previously developed a clinical-genetic score combining three clinical variables with nine single nucleotide polymorphisms to predict weight-loss success at 12-18 months after BS. In the present study we evaluated the usefulness of this clinical-genetic score to predict longitudinal weight-loss trajectories up to five years after BS. Methods: Multicenter retrospective cohort study including 342 adults who underwent Roux-en-Y gastric bypass or sleeve gastrectomy (2018-2020) with available genetic data. Patients were classified as into higher or lower predicted response groups using the OBEGEN cut-off (0.662). The primary outcome was percentage total weight loss (%TWL) assessed from 6 months to 5 years. Longitudinal trajectories were analyzed using linear mixed-effects models adjusted for baseline BMI, sex, type 2 diabetes, and center. Secondary outcomes included the proportion achieving >20% TWL and recurrent weight gain. Results: Patients in the higher predicted response group achieved greater %TWL throughout follow-up than those in the lower predicted response group (adjusted β = 2.60%, p = 0.009). Differences emerged early after surgery and remained stable over time without progressive divergence. At 5 years, a higher proportion of patients in the higher predicted response group maintained >20% TWL (78.7% vs. 60.0%, p = 0.001). Discriminatory performance of response to BS was moderate but consistent (area under the receiver operating characteristic curve 0.674 at 1 year; 0.608 at 5 years). Conclusion: The OBEGEN clinical-genetic score stratifies patients into distinct medium-term weight-loss trajectories after bariatric surgery, supporting its utility as a preoperative tool for risk stratification and personalized management in obesity.
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