NRG4 and acromegaly: In the acromegaly group, lean body mass (r = 0.347, p = 0.033), fasting glucose (r = 0.402, p = 0.010), TG (r = 0.480, p = 0.002) and TyG index (r = 0.547, p < 0.001) were positively associated with neuregulin-4.