Non-Small Cell Lung Cancer
- Author: Winston W Tan, MD, FACP; Chief Editor: Jules E Harris, MD, FACP, FRCPC more...
Non-small cell lung cancer (NSCLC) accounts for approximately 85% of all lung cancers. Histologically, NSCLC is divided into adenocarcinoma, squamous cell carcinoma (SCC) (see the image below), and large cell carcinoma. Patients with NSCLC require a complete staging workup to evaluate the extent of disease, because stage plays a major role in determining the choice of treatment.
See Clinical Presentations of Lung Cancer: Slideshow, a Critical Images slideshow, to help efficiently distinguish lung carcinomas from other lung lesions, as well as how to stage and treat them.
Also, see The Solitary Pulmonary Nodule: Is It Lung Cancer? slideshow for more information on benign and malignant etiologies of solitary pulmonary nodules and the Cutaneous Clues to Diagnosing Metastatic Cancer slideshow to help identify various skin lesions that are cause for concern.
Signs and symptoms
NSCLC is often insidious, producing no symptoms until the disease is well advanced. Early recognition of symptoms may be beneficial to outcome.
At initial diagnosis, 20% of patients have localized disease, 25% of patients have regional metastasis, and 55% of patients have distant spread of disease. Symptoms depend on the location of cancer.
The most common signs and symptoms of lung cancer include the following:
Shortness of breath
Coughing up blood
Recurring infections such as bronchitis and pneumonia
Weight loss and loss of appetite
Metastatic signs and symptoms may include the following:
Spinal cord impingement
Neurologic problems such as headache, weakness or numbness of limbs, dizziness, and seizures
See Presentation for more detail.
After physical examination and CBC, chest x-ray is often the first test performed. Chest radiographs may show the following:
Pulmonary nodule, mass, or infiltrate
There are several methods of confirming diagnosis, with the choice determined partly by lesion location. These methods include the following:
Transthoracic needle biopsy (CT- or fluoroscopy-guided)
A chest CT scan is the standard for staging lung cancer. The TNM (tumor-node-metastasis) staging system from the American Joint Committee for Cancer Staging and End Results Reporting is used for all lung carcinomas except small-cell lung cancer. The TNM takes into account the following key pieces of information:
T describes the size of the primary tumor
N describes the spread of cancer to regional lymph nodes
M indicates whether the cancer has metastasized
Primary tumor (T) involvement is as follows:
Tx - Primary tumor cannot be assessed
T0 - No evidence of tumor
Tis - Carcinoma in situ
T1, T2, T3, T4: size and/or extension of the primary tumor
Lymph node (N) involvement is as follows:
Nx - Regional nodes cannot be assessed
N0 - No regional node metastasis
N1 - Metastasis in ipsilateral peribronchial and/or ipsilateral hilar nodes and intrapulmonary nodes, including involvement by direct extension
N2 - Metastasis in ipsilateral mediastinal and/or subcarinal node
N3 - Metastasis in contralateral mediastinal, contralateral hilar, ipsilateral or contralateral scalene node, or supraclavicular node
Metastatic (M) involvement is as follows:
M0 - No metastasis
M1 - Distant metastasis
Surgery, chemotherapy, and radiation are the main treatment options for NSCLC. Because most lung cancers cannot be cured with currently available therapeutic modalities, the appropriate application of skilled palliative care is an important part of the treatment of patients with NSCLC.
Surgery is the treatment of choice for stage I and stage II NSCLC. Several different types of surgery can be used, as follows:
Lobectomy – removing a section of the lung
Pneumonectomy – removing the entire lung
Wedge resection – removing part of a lobe
Approximately 80% of all patients with lung cancer are considered for chemotherapy at some point during the course of their illness. Multiple randomized, controlled trials and large meta-analyses all confirm the superiority of combination chemotherapy regimens up front for advanced NSCLC.
The American Society for Clinical Oncology (ASCO) guidelines recommend that first-line treatment for NSCLC include a platinum combination. In younger patients, with a good performance status or in the adjuvant setting, cisplatin is preferred, but in older patients or those with significant comorbidities, carboplatin may be substituted.
In the treatment of stage I and stage II NSCLC, radiation therapy alone is considered only when surgical resection is not possible. Radiation is a reasonable option for lung cancer treatment among those who are not candidates for surgery. Beta blockers have been found to improve overall survival, disease-free survival, and distant metastasis–free survival, though not locoregional progession–free survival, in patients with NSCLC undergoing radiotherapy.[4, 5]
See Treatment for more detail.
Lung cancers are generally divided into two main categories: small cell lung cancer (SCLC) and non–small cell lung cancer (NSCLC). NSCLC accounts for approximately 85% of all lung cancers. Histologically, NSCLC is divided further into adenocarcinoma, squamous cell carcinoma (SCC), and large cell carcinoma. (See Pathophysiology.)
Lung cancer was a rare entity in the early 1900s but has since become far more prevalent. The prevalence of lung cancer is second only to that of prostate cancer in men and breast cancer in women. By the end of the 1900s, lung cancer had become the leading cause of preventable death in the United States, and recently, it surpassed heart disease as the leading cause of smoking-related mortality.
Lung cancer is the leading cause of cancer-related mortality in both men and women not only in the United States but also throughout the world. In 2016, the disease is expected to cause approximately 158,000 deaths in the United States—more than colorectal, breast, and prostate cancers combined. The types of lung cancer in the United States, as well as in many other countries, have also changed in the past few decades: the frequency of adenocarcinoma has risen, and that of SCC has declined. (See Epidemiology.)
Most lung carcinomas are diagnosed at an advanced stage, conferring a poor prognosis. The need to diagnose lung cancer at an early and potentially curable stage is thus obvious. (See Prognosis.) In addition, most patients who develop lung cancer have been smokers and have smoking-related damage to the heart and lungs, making aggressive surgical or multimodality therapies less viable options.
Lung cancer is often insidious, producing no symptoms until the disease is well advanced. In approximately 7-10% of cases, lung cancers are diagnosed incidentally in asymptomatic patients, when a chest radiograph performed for other reasons reveals the disease. Numerous pulmonary signs may be associated with NSCLC. Systemic findings may include unexplained weight loss and low-grade fever. (See Presentation.)
Because of the importance of stage on the therapeutic decision-making process, all patients with NSCLC must be staged adequately. A complete staging workup for NSCLC should be carried out to evaluate the extent of disease. (See Workup.)
Treatment primarily involves surgery, chemotherapy, or radiation therapy. Because most lung cancers cannot be cured with currently available therapeutic modalities, the appropriate application of skilled palliative care is an important part of the treatment of patients with NSCLC. (See Treatment.)
The American College of Chest Physicians (ACCP) updated its comprehensive set of lung cancer guidelines in 2013. The guideline set includes an executive summary of current recommendations for diagnosis and treatment. For a summary of guidelines issued by major organizations, see Non-Small Cell Lung Cancer Guidelines.
Go to Small Cell Lung Cancer for complete information on this topic.
Both exposure (environmental or occupational) to particular agents and an individual’s susceptibility to these agents are thought to contribute to one’s risk of developing lung cancer. In the United States, active smoking is responsible for approximately 90% of lung cancer cases. Occupational exposures to carcinogens account for approximately 9-15% of lung cancer cases.
Exposure to carcinogens
Tobacco smoke contains more than 300 harmful substances with at least 40 known potent carcinogens. Polyaromatic hydrocarbons and nicotine-derived nitrosamine ketone (NNK) are known to cause DNA damage by forming DNA adducts in animal models. Benzo-A-pyrine also appears to induce molecular signaling such as AKT, as well as inducing mutations in p53 and other tumor suppressor genes.
The most common occupational risk factor for lung cancer is exposure to asbestos. Studies have shown radon exposure to be associated with 10% of lung cancer cases, while outdoor air pollution accounts for perhaps 1-2%. In addition, preexisting nonmalignant lung diseases, such as chronic obstructive pulmonary disease, idiopathic pulmonary fibrosis, and tuberculosis have all been shown to be associated with increased lung cancer rates.
The current multiple hit theory suggests that a series of toxic cellular insults disrupts orderly genetic reproduction. Symptoms ultimately develop from the uncontrolled disorganized growth that interferes with local or distant anatomy or physiologic processes.
A study by Ito et al assessed the shift in histologic types of lung cancer in Japan and the United States in relation to the shift from nonfiltered to filtered cigarettes. The study determined that the shift in cigarette types only altered the most frequent type of lung cancer, which shifted from SCC to adenocarcinoma.
Advanced molecular techniques have identified amplification of oncogenes and inactivation of tumor suppressor genes in NSCLC. The most important abnormalities detected are mutations involving the ras family of oncogenes. The ras oncogene family has 3 members: H-ras, K-ras, and N-ras. These genes encode a protein on the inner surface of the cell membrane with guanosine triphosphatase activity and may be involved in signal transduction.
Studies performed on mice suggest the involvement of ras mutations in the molecular pathogenesis of NSCLC. Studies in humans suggest that ras activation contributes to tumor progression in persons with lung cancer. The ras gene mutations occur almost exclusively in adenocarcinoma and are found in 30% of such cases. These mutations were not identified in adenocarcinomas that developed in persons who do not smoke. The K-ras mutation appears to be an independent prognostic factor.
Studies are ongoing to develop management plans according to the presence or absence of ras gene mutations.
Other molecular abnormalities found in NSCLC include mutations in the oncogenes c-myc and c-raf and in the tumor suppressor genes retinoblastoma (Rb) and p53.
Two studies have documented early and extensive mutations in lung cancers that result in pronounced intratumor heterogeneity by the time these cancers manifest clinically—thus helping to explain why these cases so often fail to respond to treatment. A study by Zhang and colleagues identified 20 of 21 known cancer gene mutations in all regions of 11 localized lung adenocarcinomas. On follow-up, patients who had postsurgical relapse had significantly larger fractions of subclonal mutations in their primary tumors.[11, 12]
Similarly, a study by de Bruin and colleagues in seven operable NSCLCs determined that there was a long period of tumor latency between early mutations and clinical symptoms, which appeared after new mutations triggered rapid disease growth. In some former smokers, the initial mutations dated back to when they were smoking cigarettes, two decades earlier. Over time, however, those mutations became less important, with more recent mutations resulting from a new process controlled by a protein called APOBEC.[11, 13]
Classification of lung cancer
Lung cancers are generally divided into 2 main categories: SCLC and NSCLC. NSCLC accounts for approximately 85% of all lung cancers. NSCLC is divided further into adenocarcinoma, SCC, and large cell carcinoma. All share similar treatment approaches and prognoses but have distinct histologic and clinical characteristics.
Adenocarcinoma, arising from the bronchial mucosal glands, is the most common NSCLC cancer in the United States, representing 35-40% of all lung cancers. It is the subtype observed most commonly in persons who do not smoke. It usually occurs in a peripheral location within the lung, in some cases at the site of pre-existing scars, wounds, or inflammation (ie, a “scar carcinoma”).
Bronchoalveolar carcinoma is a distinct subtype of adenocarcinoma with a classic manifestation as an interstitial lung disease on chest radiograph. Bronchoalveolar carcinoma arises from type II pneumocytes and grows along alveolar septa. This subtype may manifest as a solitary peripheral nodule, multifocal disease, or a rapidly progressing pneumonic form. A characteristic finding in persons with advanced disease is voluminous watery sputum.
Squamous cell carcinoma
SCC accounts for 25-30% of all lung cancers. Whereas adenocarcinoma tumors are peripheral in origin, SCC is found in the central parts of the lung (see the image below). The classic manifestation is a cavitary lesion in a proximal bronchus. This type is characterized histologically by the presence of keratin pearls and can be detected with cytologic studies because it has a tendency to exfoliate. It is the type most often associated with hypercalcemia.
Large-cell carcinoma accounts for 10-15% of lung cancers, typically manifesting as a large peripheral mass on chest radiograph. Histologically, this type has sheets of highly atypical cells with focal necrosis, with no evidence of keratinization (as is typical of SCC) or gland formation (as is typical of adenocarcinomas).
With improved histopathologic procedures and the use of electron microscopy, most NSCLCs that would previously have been classified as large-cell carcinomas are identified as undifferentiated adenocarcinomas or, less frequently, as SCCs. Large-cell undifferentiated cancers have the same prognosis as do adenocarcinomas and are combined with them in clinical trials.
Causes of lung cancer include the following:
Smoking (78% in men, 90% in women)
Halogen ether exposure
Chronic interstitial pneumonitis
Inorganic arsenic exposure
Radioisotope exposure, ionizing radiation
Chromium, nickel exposure
Vinyl chloride exposure
Unlike many other malignancies, whose causes are largely unknown, lung cancer is known to be caused by tobacco smoking in as many as 90% of patients. However, two recent studies have reported rising NSCLC rates in persons who have never smoked: In a United States study, rates increased from 8.9% in 1990–1995 to 19.5% in 2011–2013, while a study from the United Kingdom reported an increase from 13% to 28% during a 6-year period.
Because not all smokers develop lung cancer and not all lung cancer patients have a history of smoking, other factors (eg, genetic susceptibility [see Pathophysiology], arsenic exposure, radiation exposure, and other environmental carcinogens ) also play a causative role, either independently or in conjunction with smoking. Genetic factors probably contribute in all populations, but the contribution of other factors is population-specific.
A study by Bagnardi et al determined that alcohol is not an independent factor in the etiology of lung cancer.
Smoking prevalence in the United States has gradually declined over last 4 decades. In 2012, there were an estimated 42.1 million active smokers in the United States. Overall smoking prevalence declined from 20.9% in 2005 to 18.1% in 2012. Worldwide, the incidence of smoking in developing countries is on the rise, with almost 320 million smokers in China alone.
The development of lung cancer is directly related to number of cigarettes smoked, length of smoking history, and the tar and nicotine content of the cigarettes. Risk is highest among current smokers and lowest among nonsmokers. A large trial showed that persistent smokers had a 16-fold elevated lung cancer risk, which was further doubled in those who started smoking when younger than 16 years. The age-adjusted incidence rates range from 4.8-20.8 per 100,000 among nonsmokers to 140-362 per 100,000 among active smokers.
Although tobacco smoking is the major cause of lung cancer, it is now believed that males and females may differ in their susceptibility to the carcinogenic effects of tobacco smoke. This difference may be due to differences in DNA repair mechanisms. Although still considered controversial, it is well known that women are more likely to develop adenocarcinomas and that, stage for stage, women live longer. In addition, differences in response to certain biologic therapies (eg, epidermal growth factor [EGF] inhibitors) and antiangiogenic agents have been observed between sexes.
The risk of lung cancer declines slowly after smoking cessation. Long-term follow-up studies show that the relative risk remains high in the first 10 years after cessation and gradually declines to 2-fold approximately 30 years after cessation. This long-term risk explains the development of almost 50% of United States lung cancer cases in past smokers.
A minority of lung cancers develop in persons who have never smoked. These lung cancers are genetically distinct from smoking-related NSCLC, and this distinction may have therapeutic implications. The observed genetic differences include a lower frequency of K -ras and a higher frequency of mutations in the EGF receptor and likely are responsible for the higher efficacy of EGF receptor inhibitors in this patient population.
Cigarette smoke containing the carcinogenic N -nitrosamines and aromatic polycyclic hydrocarbons can be inhaled passively by nonsmokers (secondhand smoke); urinary levels of these carcinogens in nonsmokers are 1-5% of those found in active smokers. As many as 25% of the lung cancers in persons who do not smoke are believed to be caused by secondhand smoke.
The US Environmental Protection Agency has recognized passive smoking as a potential carcinogen. About 3000 cases of lung cancer appear to be related to passive exposure. This awareness has led to local ordinances restricting smoking in enclosed public places, including restaurants and government buildings.
The silicate type of asbestos fiber is an important carcinogen. Asbestos exposure has been shown to be strongly associated with the causation of lung cancer, malignant pleural mesothelioma, and pulmonary fibrosis. Asbestos exposure increases the risk of developing lung cancer by as much as 5 times.
Tobacco smoke and asbestos exposure act synergistically, and the risk of developing lung cancer for persons who currently smoke tobacco and have a history of asbestos exposure approaches 80-90 times that of control populations.
Radon is an inert gas produced as a result of uranium decay. Radon exposure is a well-established risk factor for lung cancer in uranium miners. Approximately 2-3% of lung cancers annually are estimated to be caused by radon exposure. Household exposure to radon, however, has never been clearly shown to cause lung cancer.
The US National Research Council’s report of the Sixth Committee on Biological Effects of Ionizing Radiation has estimated that radon exposure causes 2100 new lung cancers each year, while it contributes to lung cancer causation in approximately 9100 persons who smoke.
Persons with HIV infection have a higher lung cancer risk than those without HIV infection, with relative risk estimates ranging from 2 to 11. In persons with HIV infection, lung cancer is the most common and most fatal non-AIDS-associated malignancy, accounting for about 16% of deaths. A majority of these cases are adenocarcinomas. In most, but not all, studies the incidence and risk of lung cancer in HIV-infected persons did not change significantly with the advent of highly active antiretroviral therapy.
Lung cancer in HIV-infected persons develops almost exclusively in smokers, but HIV infection appears to increase lung cancer risk independent of smoking status, by a factor of at least 2.5-fold. Compared with lung cancer patients in the general population, HIV-infected patients with lung cancer are significantly younger. Most patients with HIV infection and lung cancer present with advanced-stage disease and have significantly shorter median survival.
Other environmental agents
Beryllium, nickel, copper, chromium, and cadmium have all been implicated in causing lung cancer.
Dietary fiber and vegetables have been suggested as protective from lung cancer. Although diets rich in fruits and vegetables appear to be associated with lower rates of lung cancer, trials of supplemental beta-carotene, alone or in combination with vitamin E or retinyl palmitate, in persons at high risk for lung cancer found that this supplementation actually increased the incidence of lung cancers.
United States statistics
In the United States, lung cancer is the second most common cancer, after prostate cancer in men and breast cancer in women, and the most common cause of cancer deaths. The American Cancer Society projects that 224,390 cancers of the lung and bronchus will be diagnosed in the United States in 2016, with 158,080 deaths. Approximately 85% of those cases are expected to be NSCLC.
In US men, the incidence of lung cancer has been decreasing since the mid-1980s. In US women, however, the rate has been decreasing only since the mid-2000s. From 2007 to 2011, the incidence of lung cancer decreased by 3.0% per year in men and by 2.2% per year in women.
Lung cancer death rates for US women are among the highest in the world. Although in the United States, death rates are higher in men than in women, rates for US men are still lower than rates for men in several other countries.
These trends in US death rates parallel trends in smoking prevalence over the past 50 years. Overall, the prevalence of smoking in the United States declined from 20.9% in 2005 to 18.1% in 2012.
Lung cancer is the most commonly diagnosed cancer worldwide, and its incidence continues to grow. In 2012, an estimated 1.8 million new cases of lung cancer were diagnosed globally, accounting for approximately 13% of the global cancer burden. An estimated 1.59 million lung cancer deaths occurred in 2012. Among all cancers, lung cancer now has the highest mortality rate in most countries, with industrialized regions such as North America and Europe having the highest rates.
Several differences exist in lung cancer incidence according to geographic area. The highest incidence occurs in Hungary (51.6 cases per 100,000 population per year), followed by Serbia and the Democratic Republic of Korea. The lowest incidence rates occur in central Africa (approximately 1 case per 100,000 population per year). With increased smoking in developing countries, the incidence is expected to increase in the next few years, notably in China and India.
Generally, global lung cancer trends have followed the trends in smoking, with a lag time of several decades. Lung cancer incidence has been declining in several countries, including the United States, Canada, the United Kingdom, and Australia, following the decreasing rate of smoking. Lung cancer incidence among women, however, continues to increase in several parts of the globe, although it has begun to plateau in the United States. Notably, despite a very low rate of smoking, Chinese females have a higher incidence of lung cancer than European females.
Age and sex distribution
Lung cancer occurs predominately in persons aged 50-70 years. The probability of developing lung cancer remains very low until age 39 years in both sexes. It then slowly starts to rise and peaks among those older than 70 years. The risk of developing lung cancer remains higher among men in all age groups after age 40 years.
Lung cancer is more common in men than in women. In the United States, Northern Europe, and Western Europe, the prevalence of lung cancer has been decreasing in men. In Eastern and Southern European countries, the incidence of lung cancer has been rapidly increasing. Most Western countries have encountered a disturbing trend of increasing prevalence in women and younger patients. Women have a higher incidence of localized disease at presentation and of adenocarcinoma and typically are younger when they present with symptoms.
In the United States, the probability of developing lung cancer remains equal in both sexes until age 39 years (0.03% or approximately 1 in 3,000). It then starts to increase among men compared with women, reaching a maximum in those older than 70 years (6.74% vs 4.61% or 1 in 15 vs 1 in 22, among men and women respectively).
Incidence and survival by race
Whereas lung cancer incidence rates are similar among African-American and white women, lung cancer occurrence is approximately 45% higher in African-American men than in white men. This increased incidence has been attributed to differences in smoking habits; however, recent evidence suggests a slight difference in susceptibility.
From 1995-2001, the 5-year relative survival rate was 13% lower in African Americans compared with white individuals. This racial gap persisted within each stage at diagnosis for both men and women.
Trends in 5-year survival rates in lung cancer from 1975-2003 revealed that while modest gains occurred in 5-year survival rates among whites, survival rates remained unchanged in the African-American population. Current 5-year survival rates are estimated to be 16% among whites and 13% among non-whites.
Lung cancer is highly lethal. In Europe, the 5-year overall survival rate is 11%. The highest recorded 5-year patient survival rates are observed in the United States. US data collected from 2005–2011 indicate that the 5-year relative survival rate for lung cancer was 17.4%, reflecting a steady but slow improvement from 12.5% in 1975.[24, 27] However, the 5-year relative survival rate varies markedly, depending on how advanced the disease is at diagnosis, as follows :
54.8% for localized disease
27.4% for regional disease
4.2% for distant-metastasis disease
Estimated 5-year survival rates for specific stages of disease are as follows:
Stage IA - 75%
Stage IB - 55%
Stage IIA - 50%
Stage IIB - 40%
Stage IIIA - 10-35%
Stage IIIB - Less than 5%
Stage IV - Less than 5%
Prognostic factors for NSCLC are summarized in the image below.
A retrospective Surveillance, Epidemiology, and End Results (SEER) data analysis suggests that the number of nodes with cancer may be predictive of survival. Mean lung cancer-specific survival decreased from 8.8 years for patients with one positive lymph node to 3.9 years for patients with more than eight positive lymph nodes.
Patients with in situ and stage I lung cancer may respond to surgery. Their prognosis is far better than that of patients with more advanced disease. In patients with radiologically occult lung neoplasms, the 5-year survival rate is 24-26%; in those with abnormal chest radiographic findings, the rate is 12%. If the cancer is nonresectable, the prognosis is poor, with a mean survival rate of 8-14 months.
Mostertz et al found that in some patient populations, the oncogenic pathway activation profile of the tumor can have prognostic significance. Retrospective analysis of 787 patients with predominantly early-stage NSCLC, using gene expression profiling, showed the following:
In patients younger than 70 years, high-risk patients, with the shortest recurrence-free survival, demonstrated increased activation of the Src and tumor necrosis factor (TNF) pathways.
In women, high-risk patients demonstrated increased activation of the invasiveness and signal transducer and activator of transcription 3 (STAT3) pathways.
Multivariate analyses confirmed the independent clinical relevance of the pathway-based subphenotypes in women and patients younger than 70 years.
A meta-analysis by Parsons et al suggests that smoking cessation after diagnosis of early-stage lung cancer may improve prognosis, probably by reducing cancer progression. Life table modelling on the basis of data from 9 studies gave an estimated 5-year survival rate of 33% in 65-year-old patients with early-stage NSCLC who continued to smoke compared with 70% in those who quit smoking.
In an analysis of data on 4200 patients who participated in the National Comprehensive Cancer Network's NSCLC Database Project, patients who were current smokers at the time of diagnosis had worse survival compared with patients who never smoked, and among younger patients with stage IV disease, current smokers had worse survival compared with former smokers who quit smoking more than 12 months before being diagnosed.
Secondary analyses of the Women’s Health Initiative (WHI) randomized, placebo-controlled trial demonstrated an association between the use of daily conjugated equine estrogen (CEE, 0.625 mg) plus medroxyprogesterone acetate (MPA, 2.5 mg) and NSCLC. Women who used CEE plus MPA for more than 5 years were at increased risk for NSCLC, and women using CEE plus MPA who were diagnosed with NSCLC had higher mortality than women with NSCLC who do not take hormone therapy.
The WHI analyses included 16,608 multiethnic postmenopausal women aged 50-79 years. Confirmation of lung cancers was completed by medical record review. This area deserves more attention and study to determine the risks and benefits of hormone therapy for postmenopausal women who smoke.
In contrast, a study by Bouchardy et al found that patients who had received antiestrogen treatment for breast cancer had a lower lung cancer mortality rate. However, use of antiestrogens did not significantly lower standardized incidence ratios for lung cancer.
A review of eight trials by Rothwell et al found that allocation to daily aspirin reduced death caused by a variety of cancers, including adenocarcinoma of the lung (but no other form of lung cancer). A latent period of 5 years was observed before risk of death was decreased for lung cancer, but 20-year risk of cancer death remained lower in the aspirin groups. Benefit was unrelated to aspirin dose (75 mg or higher), sex, or smoking, but increased with age, with the absolute reduction in 20-year risk of cancer death reaching 7.08% at age 65 years and older.
Although tumor-node-metastasis (TNM) staging is the best prognostic factor for NSCLC, a study by Hofman et al concluded that preoperative detection of circulating tumor cells (CTCs) has prognostic significance. The results showed that the presence and level of 50 or more circulating nonhematologic cells (CNHC) were associated with worse survival among patients with resectable NSCLC. Although CTCs are potentially interesting, the significance of their presence is still being debated.
Risk of recurrence
In a 2012 retrospective review of 1402 consecutive stage I-III (N0-N1) NSCLC patients who underwent complete resection without adjuvant radiation therapy, significant risk factors for local recurrence included surgical procedure (single/multiple wedges + segmentectomy versus lobectomy + bilobectomy + pneumonectomy), visceral pleural invasion, and tumor size >2.7 cm. Significant risk factors for regional recurrence included pathologic N1 stage, lymphovascular space invasion, and visceral pleural invasion.
In a study of 452 cases of stage I lung adenocarcinoma, thyroid transcription factor–1 (TTF-1) expression independently predicted the risk of disease recurrence. The 5-year cumulative incidence of recurrence was 40% for patients with negative TTF-1 expression, versus 15% for those with positive TTF-1 expression (P < 0.001.
According to a 2013 retrospective analysis of 734 patients with stage I adenocarcinoma no larger than 2 cm, recurrence of small, early-stage adenocarcinoma after limited lung resection is three times more likely when the micropapillary component of the tumor is 5% or greater. In the 258 study patients who underwent wedge resection or segmentectomy, after adjustment for both vascular and lymphatic invasion, the presence of a micropapillary component of 5% or greater was independently associated with a 5-year cumulative incidence of recurrence (hazard ratio = 3.11). Micropapillary status was not significantly associated with recurrence in the 476 patients who underwent lobectomy.[39, 40]
Advise patients that smoking cessation is the most important measure for preventing lung cancer; it may also improve prognosis in patients with early-stage lung cancer. Smoking cessation by others who share the patient’s home, car, or both is also important. According to published data, the use of nicotine alternatives (eg, gum, patch, spray) instead of cigarettes reduces the incidence of lung cancer, although it does not affect the incidence of ischemic heart disease.
Advise the patient to avoid asbestos exposure. Consider prophylactic administration of retinoids, such as beta-carotene.
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