Abstract
Purpose
Assess cyclin A in nonfunctioning pituitary adenomas (NFPA) and compare its expression in non-invasive and non-proliferative tumors with invasive and proliferative tumors (12× higher risk of recurrence).
Methods
Quantitative real time polymerase chain reaction to analyze cyclin A using normal pituitary gland as reference. Fold change (FC) > 1 was considered as increased. Tumor invasion was based on Knosp criteria (grades 3–4 considered invasive) and proliferation on the presence of at least two of three criteria: Ki-67 ≥ 3%; mitoses > 2/10; positive p53. Both groups were compared with Mann–Whitney test considering p value < 0.05 as statistically significant.
Results
Thirty-one patients with NFPA were included. Tumors were mainly of gonadotrophic origin (74.2%), followed by corticotrophic (19.4%) and lactotrophic (3.2%) origins and null-cell adenomas (3.2%). Median tumor diameter was 3.5 cm (1.8–8.0) and Ki-67 was 3.0% (0.3–11%). Sixteen patients had tumors classified as non-invasive and non-proliferative and 15 as invasive and proliferative. Median FC was 0.31 in all tumors (0.13–1.94). Cyclin A was not related to invasion or proliferation (FC 0.41 in non-invasive and non-proliferative tumors and FC 0.30 in invasive and proliferative tumors; p = 0.968). Four (12.9%) patients had tumors that exhibited increased cyclin A [median FC of 1.04 (1.02–1.94)]—three of gonadotrophic origin and one null-cell adenoma, with two tumors classified as non-invasive and non-proliferative and two tumors classified as invasive and proliferative. Median tumor diameter in these samples was 3.4 cm (2.4–3.6) and Ki-67 was 5.1% (2–11%).
Conclusions
Cyclin A was increased in a minority of NFPA and does not seem to be related to invasion or proliferation.
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We would like to thank Diego de Araújo Santos and Heliomar Pereira Marcos for preparing the histopathological sections.
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Lamback, E.B., Guterres, A., Barbosa, M.A. et al. Cyclin A in nonfunctioning pituitary adenomas. Endocrine 70, 380–387 (2020). https://doi.org/10.1007/s12020-020-02402-5
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DOI: https://doi.org/10.1007/s12020-020-02402-5