Stroma-and Tumor-Associated Predictive Features In Salivary Gland Adenoid Cystic Carcinoma of the Head and Neck

Overview

Journal J Oral Pathol Med

Specialties Dentistry
Pathology

Date 2024 Nov 11

PMID 39523633

Authors

Aleksi Rytkonen

Hanna K Laine

Antti Makitie

Caj Haglund

Jaana Hagstrom

Alhadi Almangush

Ilmo Leivo

Affiliations

Soon will be listed here.

Abstract

Background: There is lack of knowledge on the utility of prognostic histopathologic characteristics in adenoid cystic carcinoma (ACC) of the head and neck. We evaluated the prognostic value of tumor and stroma-related histopathologic features in ACC.

Materials And Methods: A total of 65 cases of ACC from minor and major salivary glands were included in this study. We evaluated tumor budding, tumor-infiltrating lymphocytes (TILs), and tumor-stroma ratio (TSR) in hematoxylin and eosin (HE) stained sections.

Results: Stroma-rich ACCs recurred more frequently (p = 0.029) during follow-up and associated with distant metastasis (p = 0.038). In multivariable analysis, stroma-rich tumors associated with poorer disease-specific survival with a hazard ratio of 3.76 (95% CI 1.10-12.83, p = 0.034). ACCs commonly showed a low infiltration of TILs as 89% of the tumors was characterized by an immune desert pattern. Low infiltration of TILs associated significantly with increased tumor budding (p = 0.039).

Conclusion: Adverse features of TSR and tumor budding are widely expressed in ACC, and stroma-rich tumors are associated with poor prognosis. Low number of TILs in ACC tissue indicates a weak immune response by the host and illustrates the nature of ACC as a relentless malignancy.

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