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EDITORIAL
Year : 2013  |  Volume : 9  |  Issue : 5  |  Page : 65-66

The challenges of lung cancer in China


Tianjin Key Laboratory of Lung Cancer Metastasis and Tumor Microenvironment, Tianjin Lung Cancer Institute, Tianjin Medical University General Hospital, Tianjin 300052, China

Date of Web Publication30-Sep-2013

Correspondence Address:
Qinghua Zhou
Tianjin Key Laboratory of Lung Cancer Metastasis and Tumor Microenvironment, Tianjin Lung Cancer Institute, Tianjin Medical University General Hospital, Tianjin 300052
China
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Source of Support: None, Conflict of Interest: None


DOI: 10.4103/0973-1482.119098

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How to cite this article:
Liu Q, Zhou Q. The challenges of lung cancer in China. J Can Res Ther 2013;9, Suppl S1:65-6

How to cite this URL:
Liu Q, Zhou Q. The challenges of lung cancer in China. J Can Res Ther [serial online] 2013 [cited 2019 May 19];9:65-6. Available from: http://www.cancerjournal.net/text.asp?2013/9/5/65/119098

Lung cancer is the leading cause of cancer death worldwide and is responsible for approximately 1.4 million deaths annually. [1],[2],[3] In China, lung cancer has replaced liver cancer as the number one cause of death among people with malignant tumors from 2008. [4] According to statistics from the National Office on Tumor Cure and Prevention, about 600,000 people die of lung cancer each year in China. The main forms of lung cancer are small-cell lung carcinoma (SCLC, approximately 15% of all lung cancers) and nonsmall-cell lung carcinoma (NSCLC, approximately 85%). The treatment and diagnosis of lung cancer are major challenges. However, a better understanding of the molecular origins and development of this disease might contribute to improving the survival and life quality of patients.

Similar to many other cancers, lung cancer develops following genetic damage to DNA. This genetic damage influences the normal functions of the cell, such as cell proliferation, programmed cell death (apoptosis), and DNA repair. [5] More accumulation of damage leads to higher risk of cancer. Smoking is a major risk factors for lung cancer in China. [4] Cigarette smoke contains over 60 known carcinogens, including radioisotopes from the radon decay sequence, nitrosamine, and benzopyrene. [6] Moreover, nicotine appears to depress the immune response to cancerous growths in exposed tissue. [7] In China, appoximately 30% of the world's cigarettes are consumed by an estimated 350 million smokers. [8] In addition, the passive smokers also share a significantly increased risk of lung cancer. In China, there has been a steady increase in the rate of household second-hand smoke exposure, and the rate of passive smoking among nonsmoking females has increased to 82.5%. [9] In all, the prevalence of smoking in China remains high with 350 million smokers and 740 million passive smokers. [10] Furthermore, smoking rates are increasing in the young population and in females. Thus, in China, how to control tobacco and reduce smoking rates is the first challenge.

Nevertheless, not every type of lung cancer is associated to smoke. Lung adenocarcinoma is the most common type in patients who have never smoked. [11] Lung cancer susceptibility and risk also are increased in inherited cancer syndromes caused by mutations in p53, retinoblastoma (Rb), and other genes, as well as epidermal growth factor receptor (EGFR). [12] In this issue, Chen et al. evaluated the association between pathology type and the expression level of ERCC1, BRCA1, RRM1, TUBB3, STMN1, TOP2A, and EGFR in Chinese patients with NSCLC and found that STMN1 and TOP2A genes' mRNA expression were higher in squamous lung cell cancer than that in nonsquamous lung cell cancer and ERCC1 gene expression reversed. This study will contribute to understanding the pathogenesis of different type of NSCLC. Despite of that insignificant expression pattern of EGFR between squamous or nonsquamous cancer of NSCLC, mutations, and amplification of EGFR are common in NSCLC. Somatic mutations in the kinase domain of EGFR in lung adenocarcinoma were found in approximately 10% of specimens from patients in America, while it was found in 30-50% of specimens from patients in Asia. [13] In fact, EGFR mutations often activate the EGFR-signaling pathway in the absence of ligand and promote cell proliferation, survival, antiapoptotic signals, angiogenesis, and tumor invasion. [14] Recently, treatments with EGFR-inhibitors have emerged. EGFR-tyrosine kinase inhibitor (TKI) (such as gefitinib or erlotinib) treatment of lung cancer harboring EGFR gene mutation is one of the prototypes of such therapies. [15] Which strategy is better in the management of advanced NSCLCs, if the inhibition of mutated EGFR with TKIs? [16] EGFR-TKIs were effective and had particular activity in 15-30% of NSCLC patients, with EGFR mutations being a major advantage; however, resistance sets in after approximately one year of treatment and remains as one of the biggest obstacles in anticancer treatments. [16] Moreover, there might be a severe dermatologic adverse effect related with gefitinib. In this issue, a case is reported by Li et al. Therefore, the novel therapeutic methods or targets need to be refined or discovered. In this issue, the protein kinase C (PKC) family is being discussed and reviewed as a promising target in lung cancer. The regulation role of PKCs in lung cancer is becoming increasingly clear. And the authors suggest that inhibitors of certain PKC isoforms could be applied in combination with chemo- and radio-therapies to improve therapy effectiveness and repress side-effects. Additionally, the signal transducer and activator of transcription 3 (STAT3) was also involved in the EGFR signaling pathway. STAT3 per se is an important mediator in the progression of lung cancer, which is also reviewed in this issue. The authors suggest that cell competition may be the important contribution that activation of STATs has to tumorigenesis. However, this presumption needs to be confirmed in the future. Considering that the molecular pathogenesis of lung cancer is not clear enough, the development of novel therapies is still a challenge. Comparably, the new strategies in diagnostics, including personalized diagnostics, also depend on the development of the pathogenesis.

Treatment for lung cancer depends on the cancer's specific cell type, how far it has spread, and the person's performance status. Common treatments include surgery, chemotherapy, and radiation therapy. In this issue, two articles focus on the methods of surgery. Ma et al. compared lobe-specific mediastinal lymphadenectomy (LL) and systematic mediastinal lymphadenectomy (SL) for clinical stage T 1a N 0 M 0 NSCLC and found that LL has similar efficacy as SL and it was unnecessary to perform systematic lymphadenectomy in such patients. Zhang et al. found that the thoracoscopic anatomic segmentectomy was safe and effective for stage I A peripheral lung cancer. In fact, the prognosis of lung cancer is poor, since it has often metastasized to distant organs. [17] The prognoses of these patients with metastasis lung cancer are usually poor due to the impossibility of complete resection of lung cancer. Jin et al. introduced a single institution experience with pleuropneumonectomy, which might enhance postoperative combined therapy, and beneficial to patients' long-term survival. Indeed, the mechanism of metastasis of lung cancer is unmet currently. Considering that the consequence of chemotherapy and radiotherapy is still disappointing, it is urgent to elucidate thoroughly the underlying molecular mechanisms of metastasis, which will help provide enough potential targets for clinical applications. Not surprisingly, this research field is the hotspot. Epithelia-mesenchymal transition (EMT) has been widely accepted as the early stage of tumor metastasis. [5] In this issue, the function of histone acetylation and cell polarity during EMT in lung cancer were reviewed by Zhang et al. and Liu et al., respectively. The two reviews give some new perspectives on EMT regulation. Understanding the genetic background of metastasis will contribute to the personalized treatment. [18] Besides, it also assists to finding the molecular predictors of systemic chemotherapy efficacy. In fact, no biomarker has yet reached a level of evidence to allow its routine use in metastatic lung cancer. Consequently, one of the main challenges in the future is to facilitate efficient and personalized therapeutic management of lung cancer, especially metastatic lung cancer.

As molecular mechanisms have been explored in lung cancer more recently, the personalized approach is emerging. Exact characterization and classification to patients with lung cancer will benefit to the specific and efficient management, which will contribute to improve survival rates. However, many challenges exist currently, especially in China, as the factors from environment and genetics are complicated.

 
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