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The clinical utility and prognostic value of WHO 2017 lineage-based classification of pituitary tumours have not been assessed. This study aimed to (1) determine the clinical utility of transcription factor analysis for classification of pituitary tumours and (2) determine the prognostic value of improved lineage-based classification of pituitary tumours.

This was a retrospective evaluation of patients who underwent surgical resection of pituitary tumours at St Vincent's Public and Private Hospitals, Sydney, Australia between 1990 and 2016. Included patients were at least 18 years of age and had complete histopathological data, forming the ‘histological cohort’. Patients with at least 12 months of post-surgical follow-up were included in the subgroup ‘clinical cohort’. The diagnostic efficacy of transcription factor immunohistochemistry in conjunction with hormone …