ALB and obesity due to melanocortin 4 receptor deficiency: When stratified by a proxy variable for obesity (metabolic score), we observed a similar positive association between albumin and the risk of developing a thyroid cancer in both groups, with a slightly higher HR for those with a metabolic score ≥ 1 [HR 1.98 (95% CI = 1.11–3.54)]) vs those with a metabolic score of 0 (1.17 (95% CI = 0.72–1.89)].