PLOD1 and adenoma: The majority of the cases involved FSH/LH-secreting PitNETs (21%, n = 8), while null cell adenomas and prolactinomas each accounted for 18% (n = 7), growth hormone (GH)-secreting PitNETs for 11% (n = 4), adrenocorticotropic hormone (ACTH)-secreting PitNETs for 8% (n = 3), and FSH-secreting PitNETs for 5% (n = 2) of the cases.