General Information About Non-Small Cell Lung Cancer (NSCLC)
NSCLC is any type of epithelial lung cancer other than small cell lung cancer (SCLC). The most common types of NSCLC are squamous cell carcinoma, large cell carcinoma, and adenocarcinoma, but there are several other types that occur less frequently, and all types can occur in unusual histologic variants. Although NSCLCs are associated with cigarette smoke, adenocarcinomas may be found in patients who have never smoked. As a class, NSCLCs are relatively insensitive to chemotherapy and radiation therapy compared with SCLC. Patients with resectable disease may be cured by surgery or surgery followed by chemotherapy. Local control can be achieved with radiation therapy in a large number of patients with unresectable disease, but cure is seen only in a small number of patients. Patients with locally advanced unresectable disease may achieve long-term survival with radiation therapy combined with chemotherapy. Patients with advanced metastatic disease may achieve improved survival and palliation of symptoms with chemotherapy, targeted agents, and other supportive measures.Incidence and Mortality
Estimated new cases and deaths from lung cancer (NSCLC and SCLC combined) in the United States in 2014:
- New cases: 224,210.
- Deaths: 159,260.
Lung cancer is the leading cause of cancer-related mortality in the United States. The 5-year relative survival rate from 1995 to 2001 for patients with lung cancer was 15.7%. The 5-year relative survival rate varies markedly depending on the stage at diagnosis, from 49% to 16% to 2% for patients with local, regional, and distant stage disease, respectively.Anatomy
NSCLC arises from the epithelial cells of the lung of the central bronchi to terminal alveoli. The histological type of NSCLC correlates with site of origin, reflecting the variation in respiratory tract epithelium of the bronchi to alveoli. Squamous cell carcinoma usually starts near a central bronchus. Adenocarcinoma and bronchioloalveolar carcinoma usually originate in peripheral lung tissue.Pathogenesis
Smoking-related lung carcinogenesis is a multistep process. Squamous cell carcinoma and adenocarcinoma have defined premalignant precursor lesions. Before becoming invasive, lung epithelium may undergo morphological changes that include the following:
- Carcinoma in situ.
Dysplasia and carcinoma in situ are considered the principal premalignant lesions because they are more likely to progress to invasive cancer and less likely to spontaneously regress.
In addition, after resection of a lung cancer, there is a 1% to 2% risk per patient per year that a second lung cancer will occur.Pathology
NSCLC is a heterogeneous aggregate of histologies. The most common histologies include the following:
- Epidermoid or squamous cell carcinoma.
- Large cell carcinoma.
These histologies are often classified together because approaches to diagnosis, staging, prognosis, and treatment are similar.Risk Factors
Several risk factors contribute to the development of lung cancer. These risk factors may include the following:
- Cigarette, pipe, or cigar smoking.
- Exposure to second-hand smoke, radon, arsenic, asbestos, chromates, chloromethyl ethers, nickel, polycyclic aromatic hydrocarbons, radon progeny, other agents, and air pollution.
- Radiation therapy to the breast or chest.
The single most important risk factor for the development of lung cancer is smoking. For smokers, the risk for lung cancer is on average tenfold higher than in lifetime nonsmokers (defined as a person who has smoked <100 cigarettes in his or her lifetime). The risk increases with the quantity of cigarettes, duration of smoking, and starting age.
Smoking cessation results in a decrease in precancerous lesions and a reduction in the risk of developing lung cancer. Former smokers continue to have an elevated risk for lung cancer for years after quitting. Asbestos exposure may exert a synergistic effect of cigarette smoking on the lung cancer risk.Prevention
A significant number of patients cured of their smoking-related lung cancer may develop a second malignancy. In the Lung Cancer Study Group trial of 907 patients with stage T1, N0 resected tumors, the rate was 1.8% per year for nonpulmonary second cancers and 1.6% per year for new lung cancers. Other studies have reported even higher risks of second tumors in long-term survivors, including rates of 10% for second lung cancers and 20% for all second cancers.
Because of the persistent risk of developing second lung cancers in former smokers, various chemoprevention strategies have been evaluated in randomized control trials. None of the phase III trials with the agents beta carotene, retinol, 13-cis-retinoic acid, [alpha]-tocopherol, N-acetylcysteine, or acetylsalicylic acid has demonstrated beneficial, reproducible results.[7-11][Level of evidence: 1iiA] Chemoprevention of second primary cancers of the upper aerodigestive tract is undergoing clinical evaluation in patients with early-stage lung cancer.Screening
In patients considered at high risk for developing lung cancer, the only screening modality for early detection that has been shown to alter mortality is low-dose helical CT scanning. Studies of lung cancer screening with chest radiography and sputum cytology have failed to demonstrate that screening lowers lung cancer mortality rates.Clinical Features
Lung cancer may present with symptoms or be found incidentally on chest imaging. Symptoms and signs may result from the location of the primary local invasion or compression of adjacent thoracic structures, distant metastases, or paraneoplastic phenomena. The most common symptoms at presentation are worsening cough or chest pain. Other presenting symptoms include the following:
- Weight loss.
Symptoms may result from local invasion or compression of adjacent thoracic structures such as compression involving the esophagus causing dysphagia, compression involving the laryngeal nerves causing hoarseness, or compression involving the superior vena cava causing facial edema and distension of the superficial veins of the head and neck. Symptoms from distant metastases may also be present and include neurological defect or personality change from brain metastases or pain from bone metastases. Infrequently, patients may present with symptoms and signs of paraneoplastic diseases such as hypertrophic osteoarthropathy with digital clubbing or hypercalcemia from parathyroid hormone-related protein. Physical examination may identify enlarged supraclavicular lymphadenopathy, pleural effusion or lobar collapse, unresolved pneumonia, or signs of associated disease such as chronic obstructive pulmonary disease or pulmonary fibrosis.Diagnosis
Treatment options for patients are determined by histology, stage, and general health and comorbidities of the patient. Investigations of patients with suspected NSCLC focus on confirming the diagnosis and determining the extent of the disease.
The procedures used to determine the presence of cancer include the following:
- Physical examination.
- Routine laboratory evaluations.
- Chest x-ray.
- Chest CT scan with infusion of contrast material.
Before a patient begins lung cancer treatment, an experienced lung cancer pathologist must review the pathologic material. This is critical because SCLC, which responds well to chemotherapy and is generally not treated surgically, can be confused on microscopic examination with NSCLC. Immunohistochemistry and electron microscopy are invaluable techniques for diagnosis and subclassification, but most lung tumors can be classified by light microscopic criteria.
(Refer to the Staging Evaluation section of this summary for more information on tests and procedures used for staging.)Molecular Features
The identification of mutations in lung cancer has led to the development of molecularly targeted therapy to improve the survival of subsets of patients with metastatic disease. In particular, subsets of adenocarcinoma now can be defined by specific mutations in genes encoding components of the epidermal growth factor receptor (EGFR) and downstream mitogen-activated protein kinases (MAPK) and phosphatidylinositol 3-kinases (PI3K) signaling pathways. These mutations may define mechanisms of drug sensitivity and primary or acquired resistance to kinase inhibitors.
Other genetic abnormalities of potential relevance to treatment decisions include translocations involving the anaplastic lymphoma kinase (ALK)-tyrosine kinase receptor, which are sensitive to ALK inhibitors, and amplification of MET (mesenchymal epithelial transition factor), which encodes the hepatocyte growth factor receptor. MET amplification has been associated with secondary resistance to EGFR tyrosine kinase inhibitors.Prognostic Factors
- Presence of pulmonary symptoms.
- Large tumor size (>3 cm).
- Nonsquamous histology.
- Metastases to multiple lymph nodes within a TNM-defined nodal station.[19-29] (Refer to the Evaluation of Mediastinal Lymph Node Metastasis section of this summary for more information.)
- Vascular invasion.[16,30-32]
For patients with inoperable disease, prognosis is adversely affected by poor performance status and weight loss of more than 10%. These patients have been excluded from clinical trials evaluating aggressive multimodality interventions.
In multiple retrospective analyses of clinical trial data, advanced age alone has not been shown to influence response or survival with therapy.
Refer to the separate treatment sections for each stage of NSCLC in this summary for more information about prognosis.
Because treatment is not satisfactory for almost all patients with NSCLC, eligible patients should be considered for clinical trials. Information about ongoing clinical trials is available from the NCI Web site.Related Summaries
Other PDQ summaries containing information related to lung cancer include the following:References
- American Cancer Society: Cancer Facts and Figures 2014. Atlanta, Ga: American Cancer Society, 2014. Available online. Last accessed May 21, 2014.
- Ries L, Eisner M, Kosary C, et al., eds.: Cancer Statistics Review, 1975-2002. Bethesda, Md: National Cancer Institute, 2005. Available online. Last accessed May 30, 2013.
- Johnson BE: Second lung cancers in patients after treatment for an initial lung cancer. J Natl Cancer Inst 90 (18): 1335-45, 1998. [PUBMED Abstract]
- Wingo PA, Ries LA, Giovino GA, et al.: Annual report to the nation on the status of cancer, 1973-1996, with a special section on lung cancer and tobacco smoking. J Natl Cancer Inst 91 (8): 675-90, 1999. [PUBMED Abstract]
- Thomas P, Rubinstein L: Cancer recurrence after resection: T1 N0 non-small cell lung cancer. Lung Cancer Study Group. Ann Thorac Surg 49 (2): 242-6; discussion 246-7, 1990. [PUBMED Abstract]
- Martini N, Bains MS, Burt ME, et al.: Incidence of local recurrence and second primary tumors in resected stage I lung cancer. J Thorac Cardiovasc Surg 109 (1): 120-9, 1995. [PUBMED Abstract]
- van Boxem AJ, Westerga J, Venmans BJ, et al.: Photodynamic therapy, Nd-YAG laser and electrocautery for treating early-stage intraluminal cancer: which to choose? Lung Cancer 31 (1): 31-6, 2001. [PUBMED Abstract]
- Blumberg J, Block G: The Alpha-Tocopherol, Beta-Carotene Cancer Prevention Study in Finland. Nutr Rev 52 (7): 242-5, 1994. [PUBMED Abstract]
- Omenn GS, Goodman GE, Thornquist MD, et al.: Effects of a combination of beta carotene and vitamin A on lung cancer and cardiovascular disease. N Engl J Med 334 (18): 1150-5, 1996. [PUBMED Abstract]
- Lippman SM, Lee JJ, Karp DD, et al.: Randomized phase III intergroup trial of isotretinoin to prevent second primary tumors in stage I non-small-cell lung cancer. J Natl Cancer Inst 93 (8): 605-18, 2001. [PUBMED Abstract]
- van Zandwijk N, Dalesio O, Pastorino U, et al.: EUROSCAN, a randomized trial of vitamin A and N-acetylcysteine in patients with head and neck cancer or lung cancer. For the EUropean Organization for Research and Treatment of Cancer Head and Neck and Lung Cancer Cooperative Groups. J Natl Cancer Inst 92 (12): 977-86, 2000. [PUBMED Abstract]
- Aberle DR, Adams AM, Berg CD, et al.: Reduced lung-cancer mortality with low-dose computed tomographic screening. N Engl J Med 365 (5): 395-409, 2011. [PUBMED Abstract]
- Travis WD, Colby TV, Corrin B, et al.: Histological typing of lung and pleural tumours. 3rd ed. Berlin: Springer-Verlag, 1999.
- Pao W, Girard N: New driver mutations in non-small-cell lung cancer. Lancet Oncol 12 (2): 175-80, 2011. [PUBMED Abstract]
- Albain KS, Crowley JJ, LeBlanc M, et al.: Survival determinants in extensive-stage non-small-cell lung cancer: the Southwest Oncology Group experience. J Clin Oncol 9 (9): 1618-26, 1991. [PUBMED Abstract]
- Macchiarini P, Fontanini G, Hardin MJ, et al.: Blood vessel invasion by tumor cells predicts recurrence in completely resected T1 N0 M0 non-small-cell lung cancer. J Thorac Cardiovasc Surg 106 (1): 80-9, 1993. [PUBMED Abstract]
- Ichinose Y, Yano T, Asoh H, et al.: Prognostic factors obtained by a pathologic examination in completely resected non-small-cell lung cancer. An analysis in each pathologic stage. J Thorac Cardiovasc Surg 110 (3): 601-5, 1995. [PUBMED Abstract]
- Fontanini G, Bigini D, Vignati S, et al.: Microvessel count predicts metastatic disease and survival in non-small cell lung cancer. J Pathol 177 (1): 57-63, 1995. [PUBMED Abstract]
- Sayar A, Turna A, Kiliçgün A, et al.: Prognostic significance of surgical-pathologic multiple-station N1 disease in non-small cell carcinoma of the lung. Eur J Cardiothorac Surg 25 (3): 434-8, 2004. [PUBMED Abstract]
- Osaki T, Nagashima A, Yoshimatsu T, et al.: Survival and characteristics of lymph node involvement in patients with N1 non-small cell lung cancer. Lung Cancer 43 (2): 151-7, 2004. [PUBMED Abstract]
- Ichinose Y, Kato H, Koike T, et al.: Overall survival and local recurrence of 406 completely resected stage IIIa-N2 non-small cell lung cancer patients: questionnaire survey of the Japan Clinical Oncology Group to plan for clinical trials. Lung Cancer 34 (1): 29-36, 2001. [PUBMED Abstract]
- Tanaka F, Yanagihara K, Otake Y, et al.: Prognostic factors in patients with resected pathologic (p-) T1-2N1M0 non-small cell lung cancer (NSCLC). Eur J Cardiothorac Surg 19 (5): 555-61, 2001. [PUBMED Abstract]
- Asamura H, Suzuki K, Kondo H, et al.: Where is the boundary between N1 and N2 stations in lung cancer? Ann Thorac Surg 70 (6): 1839-45; discussion 1845-6, 2000. [PUBMED Abstract]
- Riquet M, Manac'h D, Le Pimpec-Barthes F, et al.: Prognostic significance of surgical-pathologic N1 disease in non-small cell carcinoma of the lung. Ann Thorac Surg 67 (6): 1572-6, 1999. [PUBMED Abstract]
- van Velzen E, Snijder RJ, Brutel de la Rivière A, et al.: Lymph node type as a prognostic factor for survival in T2 N1 M0 non-small cell lung carcinoma. Ann Thorac Surg 63 (5): 1436-40, 1997. [PUBMED Abstract]
- Vansteenkiste JF, De Leyn PR, Deneffe GJ, et al.: Survival and prognostic factors in resected N2 non-small cell lung cancer: a study of 140 cases. Leuven Lung Cancer Group. Ann Thorac Surg 63 (5): 1441-50, 1997. [PUBMED Abstract]
- Izbicki JR, Passlick B, Karg O, et al.: Impact of radical systematic mediastinal lymphadenectomy on tumor staging in lung cancer. Ann Thorac Surg 59 (1): 209-14, 1995. [PUBMED Abstract]
- Martini N, Burt ME, Bains MS, et al.: Survival after resection of stage II non-small cell lung cancer. Ann Thorac Surg 54 (3): 460-5; discussion 466, 1992. [PUBMED Abstract]
- Naruke T, Goya T, Tsuchiya R, et al.: Prognosis and survival in resected lung carcinoma based on the new international staging system. J Thorac Cardiovasc Surg 96 (3): 440-7, 1988. [PUBMED Abstract]
- Thomas P, Doddoli C, Thirion X, et al.: Stage I non-small cell lung cancer: a pragmatic approach to prognosis after complete resection. Ann Thorac Surg 73 (4): 1065-70, 2002. [PUBMED Abstract]
- Macchiarini P, Fontanini G, Hardin MJ, et al.: Relation of neovascularisation to metastasis of non-small-cell lung cancer. Lancet 340 (8812): 145-6, 1992. [PUBMED Abstract]
- Khan OA, Fitzgerald JJ, Field ML, et al.: Histological determinants of survival in completely resected T1-2N1M0 nonsmall cell cancer of the lung. Ann Thorac Surg 77 (4): 1173-8, 2004. [PUBMED Abstract]
- Earle CC, Tsai JS, Gelber RD, et al.: Effectiveness of chemotherapy for advanced lung cancer in the elderly: instrumental variable and propensity analysis. J Clin Oncol 19 (4): 1064-70, 2001. [PUBMED Abstract]