Descriptive analysis and outcomes of PitNETs treated surgically during pregnancy and postpartum

OBJECTIVE: Data on pituitary neuroendocrine tumours (PitNETs) surgically treated during pregnancy are limited, and no studies have compared these cases to those treated in non-pregnant women. This study aimed to describe the clinical, radiological, and histological profiles of patients treated surgically for PitNETs during pregnancy and evaluate long-term prognosis. DESIGN: This study was multicentric, observational, and retrospective. METHODS: We included 10 patients from 5 university hospitals who underwent surgical treatment for PitNETs during pregnancy or within 12 months postpartum, along with 30 matched non-pregnant controls treated surgically for PitNETs. Clinical and histological data, as well as progression-free survival without additional treatment, were compared between pregnant and non-pregnant patients. RESULTS AND CONCLUSIONS: Among the 10 PitNETs, 4 were corticotropic, 2 gonadotropic, 2 lactotropic, and 2 somatotropic. The primary surgical indication (tumour syndrome with or without failure of medical treatment) was similar between the two groups: 7/10 vs 19/30 (P = 1.00). There was no statistically significant difference in volume (P = .072) or radiological invasion markers (optic chiasm compression, P = .059, and cavernous sinus invasion, P = .274). However, PitNETs in pregnant women showed higher mitotic activity (P = .038) and were more frequently classified as grade 2b (Trouillas clinicopathological classification; P = .049). The need for second-line treatment was also more frequent (P = .005). PitNETs requiring surgical treatment during pregnancy are characterized by increased proliferative activity and progression after surgery. Despite this, the long-term prognosis remains favourable. These results need confirmation in a larger study.