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34. Erfani N, Khademi B, Haghshenas MR, Mojtahedi Z, Khademi B, Ghaderi A: Intracellular CTLA4 and regulatory T cells in patients with laryngeal squamous cell carcinoma. Immunol Invest 2013, 42:81–90.PubMedCrossRef Competing interests The authors declare that they have no competing interests. Authors’ contributions WS and WPW conceived and designed the experiments. WS, WJL, and CYW performed the experiments and analyzed the data. WJL performed the statistical analysis. WJL and HZ made substantial contribution to collecting blood samples. WS and WPW wrote the manuscript. All authors have read and approved the final manuscript.”
“Background Lung cancer is the leading cause of cancer-related deaths worldwide.