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Journal of Clinical Oncology, Vol 25, No 18 (June 20), 2007: pp. 2586-2593
© 2007 American Society of Clinical Oncology.
DOI: 10.1200/JCO.2006.09.4565

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Intratumoral Balance of Regulatory and Cytotoxic T Cells Is Associated With Prognosis of Hepatocellular Carcinoma After Resection

Qiang Gao, Shuang-Jian Qiu, Jia Fan, Jian Zhou, Xiao-Ying Wang, Yong-Sheng Xiao, Yang Xu, Yi-Wei Li, Zhao-You Tang

From the Liver Cancer Institute, Zhong Shan Hospital and Shanghai Medical School, Fudan University, Key Laboratory for Carcinogenesis & Cancer Invasion, the Chinese Ministry of Education, Shanghai, People's Republic of China

Address reprint requests to Jia Fan, MD, PhD, Liver Cancer Institute, Fudan University, 136 Yi Xue Yuan Rd, Shanghai 200032, People's Republic of China; e-mail: jiafan99{at}yahoo.com

Purpose To investigate the prognostic value of tumor-infiltrating lymphocytes (TILs), especially regulatory T cells (Tregs), in hepatocellular carcinoma (HCC) patients after resection.

Patients and Methods CD3+, CD4+, CD8+, Foxp3-positive, and granzyme B-positive TILs were assessed by immunohistochemistry in tissue microarrays containing HCC from 302 patients. Prognostic effects of low- or high-density TIL subsets were evaluated by Cox regression and Kaplan-Meier analysis using median values as cutoff.

Results CD3+, CD4+, CD8+ TILs were associated with neither overall survival (OS) nor disease-free survival (DFS). The presence of low intratumoral Tregs in combination with high intratumoral activated CD8+ cytotoxic cells (CTLs), a balance toward CTLs, was an independent prognostic factor for both improved DFS (P = .001) and OS (P < .0001). Five-year OS and DFS rates were only 24.1% and 19.8% for the group with intratumoral high Tregs and low activated CTLs, compared with 64.0% and 59.4% for the group with intratumoral low Tregs and high activated CTLs, respectively. Either intratumoral Tregs alone (P = .001) or intratumoral activated CTLs (P = .001) alone is also an independent predictor for OS. In addition, high Tregs density was associated with both absence of tumor encapsulation (P = .032) and presence of tumor vascular invasion (P = .031).

Conclusion Tregs are associated with HCC invasiveness, and intratumoral balance of regulatory and cytotoxic T cells is a promising independent predictor for recurrence and survival in HCC. A combination of depletion of Tregs and concomitant stimulation of effector T cells may be an effective immunotherapy to reduce recurrence and prolong survival after surgery.

Supported by grants from the National Natural Science Foundation of China (Grant No. 30200268) and the Foundation of China National "211" Project for Higher Education.

Authors’ disclosures of potential conflicts of interest and author contributions are found at the end of this article.


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