Immunohistochemical Markers of the Hypoxic Response Can Identify Malignancy in Phaeochromocytomas and Paragangliomas and Optimize the Detection of Tumours with VHL Germline Mutations
Overview
Authors
Affiliations
Background: There are no reliable markers of malignancy in phaeochromocytomas (PCC) and paragangliomas (PGL). We investigated the relevance of the mammalian target of rapamycin (mTOR)/AKT and hypoxic pathways as novel immunohistochemical markers of malignancy.
Methods: Tissue microarray blocks were constructed with a total of 100 tumours (10 metastatic) and 20 normal adrenomedullary samples. Sections were immunostained for hypoxia-inducible factor 1α (Hif-1α), vascular endothelial growth factor A (VEGF-A), mTOR, carbonic anhydrase IX (CaIX) and AKT. The predictive performance of these markers was studied using univariate, multivariate and receiver operating characteristic analyses.
Results: In all, 100 consecutive patients, 64% PCC, 29% familial with a median tumour size of 4.7 cm (range 1-14) were included. Univariate analyses showed Hif-1α overexpression, tumour necrosis, size >5 cm, capsular and vascular invasion to be predictors of metastasis. In multivariate analysis, Hif-1α, necrosis and vascular invasion remained as independent predictors of metastasis. Hif-1α was the most discriminatory biomarker for the presence of metastatic diffusion. Strong membranous CaIX expression was seen in von Hippel-Lindau (VHL) PCC as opposed to other subtypes.
Conclusion: Lack of vascular invasion, tumour necrosis and low Hif-1α expression identify tumours with lower risk of malignancy. We propose membranous CaIX expression as a potential marker for VHL disease in patients presenting with PCC.
Li J, Yu K, Chen D, Luo G, Jia J Clinics (Sao Paulo). 2024; 79:100486.
PMID: 39277981 PMC: 11419804. DOI: 10.1016/j.clinsp.2024.100486.
Iguchi D, Martins Filho S, Soares I, Siqueira S, Alves V, Assato A J Endocr Soc. 2024; 8(7):bvae093.
PMID: 38799767 PMC: 11112433. DOI: 10.1210/jendso/bvae093.
Tumour microenvironment in pheochromocytoma and paraganglioma.
Martinelli S, Amore F, Canu L, Maggi M, Rapizzi E Front Endocrinol (Lausanne). 2023; 14:1137456.
PMID: 37033265 PMC: 10073672. DOI: 10.3389/fendo.2023.1137456.
Nose V, Lazar A Head Neck Pathol. 2022; 16(1):143-157.
PMID: 35312981 PMC: 9018953. DOI: 10.1007/s12105-022-01414-z.
Pheochromocytomas and Abdominal Paragangliomas: A Practical Guidance.
Calissendorff J, Juhlin C, Bancos I, Falhammar H Cancers (Basel). 2022; 14(4).
PMID: 35205664 PMC: 8869962. DOI: 10.3390/cancers14040917.