Prognostic Significance of IMMT Expression in Surgically-resected Lung Adenocarcinoma

Overview

Journal Thorac Cancer

Specialties Oncology
Pulmonary Medicine

Date 2019 Oct 5

PMID 31583841

Citations 5

Authors

Yasuhiro Hiyoshi

Yuichi Sato

Masaaki Ichinoe

Ryo Nagashio

Daisuke Hagiuda

Makoto Kobayashi

Seiichiro Kusuhara

Satoshi Igawa

Kazu Shiomi

Naoki Goshima

Yoshiki Murakumo

Makoto Saegusa

Yukitoshi Satoh

Noriyuki Masuda

Katsuhiko Naoki

Affiliations

Soon will be listed here.

Abstract

Background: Mitochondrial dysfunction contributes to many types of human disorders and cancer progression. Inner membrane mitochondrial protein (IMMT) plays an important role in the maintenance of mitochondrial structure and function. The aims of this study were to examine IMMT expression in lung adenocarcinoma and evaluate its correlation with clinicopathological parameters and patient prognosis.

Methods: IMMT expression was immunohistochemically studied in 176 consecutive lung adenocarcinoma resection tissues, and its correlations with clinicopathological parameters were evaluated. Kaplan-Meier survival analysis and Cox-proportional hazards models were used to estimate the effect of IMMT expression on survival.

Results: High-IMMT expression was detected in 84 of 176 (47.7%) lung adenocarcinomas. Levels were significantly correlated with advanced disease stage (stage II and III; P = 0.024), larger tumor size (>3 cm; P = 0.002), intratumoral vascular invasion (P < 0.001), and poorer adenocarcinoma patient prognosis (P = 0.002). Based on 176 patients with adenocarcinoma, multivariate analysis revealed that IMMT expression was an independent predictor of poorer survival (HR, 1.99; 95% confidence interval [CI], 1.06-3.74; P = 0.031). Further, treating A549 cells derived from lung adenocarcinoma, with IMMT siRNA resulted in significantly decreased proliferation.

Conclusion: Here, we first demonstrated that high-IMMT expression is related to some clinicopathological parameters, and that its expression is an independent prognostic predictor of poorer survival in patients with lung adenocarcinoma; further studies are required to clarify the biological function of IMMT in lung adenocarcinoma. However, results suggest that this protein could be a novel prognostic indicator and therapeutic target.

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