PD-L1 expression in PitNETs: Correlations with the 2022 WHO classification.

IF 1.9 Q3 CLINICAL NEUROLOGY
Brain & spine Pub Date : 2024-12-24 eCollection Date: 2025-01-01 DOI:10.1016/j.bas.2024.104171
Ethan Harel, Ekkehard Hewer, Stefano La Rosa, Jean Philippe Brouland, Nelly Pitteloud, Federico Santoni, Maxime Brunner, Roy Thomas Daniel, Mahmoud Messerer, Giulia Cossu
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引用次数: 0

Abstract

Introduction: and research question: Prognostic factors to predict the behavior of pituitary neuroendocrine tumors (PitNET) are scarce. PD-L1 expression was associated with prognosis in other neuroendocrine neoplasms and we analyzed PD-L1 expression in PitNET, according to the 2022 WHO classification.

Material and methods: A retrospective analysis was performed. Immunohistochemistry was used to define PD-L1 expression, which was quantified as TPS (tumor proportion score). The primary outcome was to assess the correlation between PD-L1 expression and transcription factors (TF), namely T-pit, Pit-1, SF-1 and GATA-3. As secondary outcomes, we evaluated the association between PD-L1 expression and proliferation indexes.

Results: Eighty-eight patients were included. The largest group belonged to the SF-1-lineage (48%), followed by tumors of the Pit-1 lineage (32%) and T-pit lineage (17%). PD-L1 expression was associated with Pit-1 expression (p < 0.001) and with the somatotroph, lactotroph and mammosomatotroph subgroups. A TPS ⩾35% showed a 100% sensitivity for the mammosomatotroph subtype, while the optimal cut-off point was 20% for somatotroph and 15% for lactotroph tumors. PD-L1 expression was negatively associated with SF-1 and GATA3 expression(p < 0.001), with an optimal cut-point ≤5%. No association was found between PD-L1 expression and immunohistochemical proliferative factors but PD-L1 expression was associated with female sex and a younger age at diagnosis.

Conclusion: PD-L1 expression was associated with PIT-1 lineage, while it was downregulated in SF-1-lineage tumors. No correlation was found with proliferative factors. The role of PD-L1 expression in determining the biological behavior of PitNET remains debated and larger studies are necessary to further confirm these findings.

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来源期刊
Brain & spine
Brain & spine Surgery
CiteScore
1.10
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