Downregulation of HLA Class I Expression through HLA-A DNA Methylation Is Associated with Reduced CD8+ T-cell Infiltration in Cervical Cancer

Q: What clinical and immunologic factors did the study link to CD8+ T-cell infiltration in cervical cancer?

The study examined the relationship between CD8+ T-cell infiltration patterns and HLA-I expression, HLA-A DNA methylation, and HLA-I loss of heterozygosity (LOH).

Q: How does HLA-A DNA methylation influence HLA-I expression and immune cell infiltration?

HLA-A DNA methylation emerged as a key driver of HLA-I downregulation, which led to reduced CD8+ T-cell infiltration.

Q: What immune escape mechanisms were identified in squamous cell carcinoma (SCC) compared with other histotypes?

In SCC, both HLA-A methylation and HLA-I LOH contributed to immune evasion; cases lacking these alterations showed the highest CD8+ T-cell infiltration levels.

Sep 22, 2026

Uploaded by Jiven

Human leukocyte antigen class I (HLA-I) is central to tumor immune recognition, yet its regulatory mechanisms in cervical cancer are incompletely defined. This study analyzed 98 cervical cancer cases across histotypes to relate CD8+ T-cell infiltration patterns (infiltrated, excluded, absent) with HLA-I expression, HLA-A DNA methylation, and HLA-I loss of heterozygosity (LOH). Reduced CD8+ infiltration associated with poor survival and reflected HLA-I downregulation, driven by HLA-A DNA methylation. In squamous cell carcinoma, HLA-A methylation and HLA-I LOH supported immune evasion, indicating biomarkers and therapeutic targeting potential.

LanguageEnglish

CategoryHealthcare

FormatPDF

Pages13

Reading Time33 min

AccessFree to download

Introduction

Clinical background and histotype diversity

Study outcomes and mechanisms

CD8+ T-cell infiltration patterns and survival impact

HLA-I expression and immune evasion pathways

Downregulation of HLA Class I Expression through HLA-ADNA Methylation Is Associated with Reduced CD8+ T-cell Infiltration in Cervical Cancer Daisuke Yoshimoto1, Hitoshi Iuchi2, Ayumi Taguchi1, Kenbun Sone1, Kana Tamai1, Ayako Mori1, Shuhei Kitamura1, Anh Quynh Duong1, Aya Ishizaka1, Misako Kusakabe1, Yoko Yamamoto1, Akiko Takase3, Masako Ikemura3, Hiroko Matsunaga4, Takayuki Iriyama1, Iwao Kukimoto5, Masahito Kawazu6, Michiaki Hamada2, Tetsuo Ushiku3, Katsutoshi Oda7, Haruko Takeyama4,8, Yasushi Hirota1, and Yutaka Osuga1,9 | | | A | | B | S | | T | R | | A | | C | T | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | --- | | | Human leukocyte antigen class I (HLA-I) is central to tumor immune recognition, but its regulatory mechanisms in cervical cancer remain poorly understood. This study aimed to elucidate the impact of HLA-I regulatory mechanisms on CD8+ T-cell infiltration and identify distinct histotype-specific immune escape strategies across cervical cancer subtypes. Using 98 cervical cancer cases, including squamous cell carcinoma (SCC; n ¼ 53), adenocarcinoma (n ¼ 32), gastric-type adenocarcinoma (GAS; n ¼ 5), small cell carcinoma (Small, n ¼ 4), and mixed histologic types (n ¼ 4), we examined the relationship between CD8+ T-cell infiltration patterns (categorized as infiltrated, excluded, or absent) and HLA-I expression, HLA-A DNA methylation, and HLA-I loss of heterozygosity (LOH) . CD8+ T-cell infiltration patterns varied significantly by histologic subtype (P < 0.0001) . SCC showed the highest frequency of the infiltrated pattern
􀀶 | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | (73.6%), whereas GAS and Small predominantly displayed an absent pattern. Reduced CD8+ T-cell infiltration correlated with poor survival (P < 0.0001) . HLA-I expression mirrored these trends being highest in SCC and lowest in Small and GAS. HLAA DNA methylation emerged as a key driver of HLA-I downregulation, leading to reduced CD8+ infiltration (P < 0.05) . In SCC, both HLA-A methylation and HLA-I LOH contributed to immune evasion; cases lacking these alterations exhibited the highest CD8+ T-cell infiltration levels (P < 0.01) . This study identifies distinct HLA-I regulatory mechanisms in cervical cancer, highlighting HLA-A methylation—and particularly HLAI LOH in SCC—as key drivers of immune evasion. These findings provide a foundation for developing predictive biomarkers and suggest that targeting these specific HLA-I regulatory mechanisms could enhance immunotherapy efficacy. | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | Introduction Cervical cancer ranks as the fourth most diagnosed cancer and the fourth leading cause ∼of cancer-related death among women worldwide (1) . Critically, 95% of cases are attributed to persistent human papillomavirus (HPV) infection, whereas the remaining 5% encompass non–HPV-associated cancers like gastric-type 1Department of Obstetrics and Gynecology, Graduate School of Medicine, The University of

FAQs

What clinical and immunologic factors did the study link to CD8+ T-cell infiltration in cervical cancer?

The study examined the relationship between CD8+ T-cell infiltration patterns and HLA-I expression, HLA-A DNA methylation, and HLA-I loss of heterozygosity (LOH).

How does HLA-A DNA methylation influence HLA-I expression and immune cell infiltration?

HLA-A DNA methylation emerged as a key driver of HLA-I downregulation, which led to reduced CD8+ T-cell infiltration.

What immune escape mechanisms were identified in squamous cell carcinoma (SCC) compared with other histotypes?

In SCC, both HLA-A methylation and HLA-I LOH contributed to immune evasion; cases lacking these alterations showed the highest CD8+ T-cell infiltration levels.

Sep 22, 2026

Uploaded by Jiven