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Small cell lung cancer (SCLC) accounts for approximately 15% of bronchogenic carcinomas.
At the time of diagnosis, approximately 30% of patients with SCLC will have tumors confined to the hemithorax of origin, the mediastinum, or the supraclavicular lymph nodes. These patients are designated as having limited-stage disease (LD). Patients with tumors that have spread beyond the supraclavicular areas are said to have extensive-stage disease (ED).
SCLC is more responsive to chemotherapy and radiation therapy than other cell types of lung cancer; however, a cure is difficult to achieve because SCLC has a greater tendency to be widely disseminated by the time of diagnosis.
Incidence and Mortality
The overall incidence and mortality rates of SCLC in the United States have decreased during the past few decades.
Estimated new cases and deaths from lung cancer (SCLC and non-small cell lung cancer [NSCLC] combined) in the United States in 2014:
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, shortness of breath, and dyspnea. Other presenting symptoms include the following:
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 with SCLC may present with symptoms and signs of one of the following paraneoplastic syndromes:
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.
Treatment options for patients are determined by histology, stage, and general health and comorbidities of the patient. Investigations of patients with suspected SCLC focus on confirming the diagnosis and determining the extent of the disease.
The procedures used to determine the presence of cancer include the following:
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 in the Stage Information for Small Cell Lung Cancer section of this summary for more information about tests and procedures used for staging.)
Prognosis and Survival
Regardless of stage, the current prognosis for patients with SCLC is unsatisfactory despite improvements in diagnosis and therapy made during the past 25 years. Without treatment, SCLC has the most aggressive clinical course of any type of pulmonary tumor, with median survival from diagnosis of only 2 to 4 months. About 10% of the total population of SCLC patients remains free of disease during the 2 years from the start of therapy, which is the time period during which most relapses occur. Even these patients, however, are at risk of dying from lung cancer (both small and non-small cell types). The overall survival at 5 years is 5% to 10%.[1,5,6,7]
An important prognostic factor for SCLC is the extent of disease. Patients with LD have a better prognosis than patients with ED. For patients with LD, median survival of 16 to 24 months and 5-year survivals of 14% with current forms of treatment have been reported.[1,6,8,9] Patients diagnosed with LD who smoke should be encouraged to stop smoking before undergoing combined-modality therapy because continued smoking may compromise survival.
Improved long-term survival in patients with LD has been shown with combined-modality therapy.[9,11][Level of evidence: 1iiA] Although long-term survivors have been reported among patients who received either surgery or chemotherapy alone, chemotherapy combined with thoracic radiation therapy (TRT) is considered the standard of care. Adding TRT increases absolute survival by approximately 5% over chemotherapy alone.[11,13] The optimal timing of TRT relative to chemotherapy has been evaluated in multiple trials and meta-analyses with the weight of evidence suggesting a small benefit to early TRT.[1,14,15][Level of evidence: 1iiA]
In patients with ED, median survival of 6 to 12 months is reported with currently available therapy, but long-term disease-free survival is rare.
Prophylactic cranial radiation prevents central nervous system recurrence and can improve survival in patients who have had a complete response to chemoradiation.[16,17][Level of evidence: 1iiA]
All patients with this type of cancer may appropriately be considered for inclusion in clinical trials at the time of diagnosis. Information about ongoing clinical trials is available from the NCI Web site.
Before initiating treatment of a patient with small cell lung cancer (SCLC), an experienced lung cancer pathologist should review the pathologic material.
The current classification of subtypes of SCLC includes the following:
SCLC arising from neuroendocrine cells forms one extreme of the spectrum of neuroendocrine carcinomas of the lung.
Neuroendocrine tumors include the following:
Because of differences in clinical behavior, therapy, and epidemiology, these tumors are classified separately in the World Health Organization (WHO) revised classification. The variant form of SCLC called mixed small cell/large cell carcinoma was not retained in the revised WHO classification. Instead, SCLC is now described with only one variant, SCLC combined, when at least 10% of the tumor bulk is made of an associated non-small cell component.
SCLC presents as a proliferation of small cells with the following morphological features:
Combined small cell carcinoma includes a mixture of small cell and large cell or any other non-small cell component. Any cases showing at least 10% of SCLC are diagnosed as combined SCLC, and SCLC is limited to tumors with pure SCLC histology. SCLC associated with LCNEC is diagnosed as SCLC combined with LCNEC.
Nearly all SCLC are immunoreactive for keratin, thyroid transcription factor 1, and epithelial membrane antigen. Neuroendocrine and neural differentiation result in the expression of dopa decarboxylase, calcitonin, neuron-specific enolase, chromogranin A, CD56 (also known as nucleosomal histone kinase 1 or neural-cell adhesion molecule), gastrin-releasing peptide, and insulin-like growth factor 1. One or more markers of neuroendocrine differentiation can be found in approximately 75% of SCLC.
Although preinvasive and in situ malignant changes are frequently found in patients with non-small cell lung cancer, these findings are rare in patients with SCLC.
Several staging systems have been proposed for small cell lung cancer (SCLC). These staging systems include the following:
No universally accepted definition of this term is available. Limited-stage disease (LD) SCLC is confined to the hemithorax of origin, the mediastinum, or the supraclavicular nodes, which can be encompassed within a tolerable radiation therapy port.
Patients with pleural effusion, massive pulmonary tumor, and contralateral supraclavicular nodes have been both included within and excluded from LD by various groups.
Extensive-stage disease (ED) SCLC has spread beyond the supraclavicular areas and is too widespread to be included within the definition of LD. Patients with distant metastases (M1) are always considered to have ED.[3,4]
IASLC-AJCC TNM Staging System
The AJCC TNM defines LD as any T, except for T3-4, due to multiple lung nodals that do not fit in a tolerable radiation field, any N, and M0. This corresponds to TNM stages I to IIIB. Extensive disease is TNM stage IV with distant metastases (M1) including malignant pleural effusions.[3,4]
The IASLC conducted an analysis of clinical TNM staging for SCLC using the sixth edition of the AJCC TNM staging system for lung cancer. Survivals for patients with clinical stages I and II disease are significantly different from those for patients with stage III disease with N2 or N3 involvement. Patients with pleural effusion have an intermediate prognosis between LD and ED with hematogenous metastases and will be classified as having M1 disease (or ED). Application of the TNM system will not change how patients are managed; however, the analysis suggests that, in the context of clinical trials in LD, accurate TNM staging and stratification may be important.
Staging procedures for SCLC are important in distinguishing patients with disease limited to their thorax from those with distant metastases. At the time of initial diagnosis, approximately two-thirds of patients with SCLC have clinical evidence of metastases; most of the remaining patients have clinical evidence of extensive nodal involvement in the hilar, mediastinal, and sometimes supraclavicular regions.
Determining the stage of cancer allows an assessment of prognosis and a determination of treatment, particularly when chest radiation therapy or surgical excision is added to chemotherapy for patients with LD. If ED is confirmed, further evaluation should be individualized according to the signs and symptoms unique to the individual patient. Standard staging procedures include the following:
The role of positron emission tomography (PET) is still under study. SCLC is fluorodeoxyglucose (FDG) avid at the primary site and at metastatic sites. PET may be used in staging patients with SCLC who are potential candidates for the addition of thoracic radiation therapy to chemotherapy, as PET may lead to upstaging or downstaging of patients and to alteration of radiation fields resulting from the identification of additional sites of nodal metastases.
Chemotherapy and radiation therapy have been shown to improve survival for patients with small cell lung cancer (SCLC).
Chemotherapy improves the survival of patients with limited-stage disease (LD) or extensive-stage disease (ED), but it is curative in only a minority of patients.[1,2] Because patients with SCLC tend to develop distant metastases, localized forms of treatment, such as surgical resection or radiation therapy, rarely produce long-term survival. With incorporation of current chemotherapy regimens into the treatment program, however, survival is prolonged, with at least a fourfold to fivefold improvement in median survival compared with patients who are given no therapy.
The combination of platinum and etoposide is the most widely used standard chemotherapeutic regimen.[4,5,6][Level of evidence: 1iiA] No consistent survival benefit has resulted from platinum versus nonplatinum combinations, increased dose intensity or dose density, altered mode of administration (e.g., alternating or sequential administration) of various chemotherapeutic agents, or maintenance chemotherapy.[7,8,9,10,11,12][Level of evidence: 1iiA]
SCLC is highly radiosensitive and thoracic radiation therapy improves survival of patients with LD and ED tumors.[13,14,15][Level of evidence: 1iiA] Prophylactic cranial radiation prevents central nervous system recurrence and may improve the long-term survival of patients who have responded to chemoradiation therapy [16,17,18][Level of evidence: 1iiA] and offers palliation of symptomatic metastatic disease.
Treatment for patients with limited-stage, extensive-stage, or recurrent SCLC is summarized in Table 1.
Despite treatment advances, the majority of patients with SCLC die of their tumor even with the best available therapy. Most of the improvements in the survival of patients with SCLC are attributable to clinical trials that have attempted to improve on the best available and most accepted therapy. Patient entry into such studies is highly desirable.
Information about ongoing clinical trials is available from the NCI Web site.
Standard Treatment Options for Patients With Limited-Stage Small Cell Lung Cancer (SCLC)
Standard treatment options for patients with limited-stage SCLC include the following:
Chemotherapy and radiation therapy
Combined-modality treatment with etoposide and cisplatin with thoracic radiation therapy (TRT) is the most widely used treatment for patients with limited-stage disease (LD) SCLC.
Evidence (combined modality treatment):
Combination chemotherapy alone
Patients with a contraindication to radiation therapy could be treated with chemotherapy alone. Patients presenting with superior vena cava syndrome are treated immediately with combination chemotherapy, radiation therapy, or both, depending on the severity of presentation.[21,22] (Refer to the PDQ summary on Cardiopulmonary Syndromes for more information.)
Surgery followed by chemotherapy or chemoradiation therapy
The role of surgery in the management of patients with SCLC is unproven. Small case series and population studies have reported favorable outcomes for the minority of LD patients with very limited disease, with small tumors pathologically confined to the lung of origin or the lung and ipsilateral hilar lymph nodes from surgical resection with adjuvant chemotherapy.[23,24,25,26,27][Level of evidence: 3iiiDii] Patients who have undergone surgery and then been diagnosed with SCLC generally receive adjuvant chemotherapy with or without radiation therapy. In patients who receive chemotherapy with radiation therapy, there is no improvement in survival with the addition of surgery.[Level of evidence: 3iiiDii] Given the absence of data from randomized trials, the role of surgery in the management of individual patients with SCLC must be considered, both in terms of potential benefit and risk from the surgical procedure.
Evidence (role of surgery):
Prophylactic cranial irradiation (PCI)
Patients who have achieved a complete remission can be considered for administration of PCI. Patients whose cancer can be controlled outside the brain have a 60% actuarial risk of developing central nervous system (CNS) metastases within 2 to 3 years after starting treatment.[27,29,30] The majority of these patients relapse only in their brain, and nearly all of those who relapse in their CNS die of their cranial metastases. The risk of developing CNS metastases can be reduced by more than 50% by the administration of PCI.
Evidence (role of PCI):
Retrospective studies have shown that long-term survivors of SCLC (>2 years from the start of treatment) have a high incidence of CNS impairment.[27,30,34,35,36] Prospective studies have shown that patients treated with PCI do not have significantly worse neuropsychological function than patients not treated. The majority of patients with SCLC have neuropsychological abnormalities present before the start of PCI and have no detectable decline in their neurological status for as long as 2 years after the start of their PCI. Patients treated for SCLC continue to have declining neuropsychologic function after 2 years from the start of treatment.[34,35,36] Additional neuropsychologic testing of patients beyond 2 years from the start of treatment will be needed before concluding that PCI does not contribute to the decline in intellectual function.
Treatment options for older patients
The optimal therapeutic approach in older patients remains unclear. A population analysis showed that increasing age was associated with a decreased performance status and increased comorbidity. Older patients were less likely to be treated with combined chemoradiation therapy, more intensive chemotherapy, and PCI. Older patients were also less likely to respond to therapy and had poorer survival outcomes. Whether this was a result of age and its associated comorbidities or suboptimal treatment delivery remains uncertain.
No specific phase III trial in older patients with LD SCLC has been reported; however, three secondary analyses of two cooperative group trials have been published evaluating outcomes in patients aged 70 years or older.[38,39,40] The survival outcomes for the older patients were identical to their younger counterparts in both trials. The older patients experienced more toxic effects, particularly hematologic, compared with younger patients. There was a significant increase in treatment-related mortality in the EST-3588 trial that compared etoposide and cisplatin with either once-daily or twice-daily radiation therapy (1% for patients aged <70 years vs. 10% for patients aged ≥70 years; P = .01). Because the older patients enrolled in these phase III trials may not be representative of LD SCLC patients in the general population, caution must be exercised in extrapolating these results to the general population of older patients.
Treatment Options Under Clinical Evaluation
Treatment options under clinical evaluation for patients with LD SCLC include the following:
Current Clinical Trials
Check for U.S. clinical trials from NCI's list of cancer clinical trials that are now accepting patients with limited stage small cell lung cancer. The list of clinical trials can be further narrowed by location, drug, intervention, and other criteria.
General information about clinical trials is also available from the NCI Web site.
Standard Treatment Options for Patients With Extensive-Stage Small Cell Lung Cancer (SCLC)
Standard treatment options for patients with extensive-stage SCLC include the following:
Chemotherapy for patients with extensive-stage disease (ED) SCLC is commonly given as a two-drug combination of platinum and etoposide in doses associated with at least moderate toxic effects (as in limited-stage [LD] SCLC). Cisplatin is associated with significant toxic effects and requires fluid hydration, which can be problematic in patients with cardiovascular disease. Carboplatin is active in SCLC, is dosed according to renal function, and is associated with less nonhematological toxic effects.
Other regimens appear to produce similar survival outcomes but have been studied less extensively or are in less common use.
Doses and schedules used in current programs yield overall response rates of 50% to 80% and complete response rates of 0% to 30% in patients with ED.[2,3][Level of evidence: 1iiA]
Intracranial metastases from small cell carcinoma may respond to chemotherapy as readily as metastases in other organs.[4,5]
Evidence (standard regimens):
Evidence (other combination chemotherapy regimens):
Evidence (duration of treatment):
Evidence (dose intensification):
A randomized, phase II study of identical design reported a significantly better median survival for the dose-dense arm (29.8 vs. 17.4 months, respectively; P = .02) and 2-year survival (62% vs. 36%, respectively; P = .05). However, given the small study size (only 70 patients), these results should be viewed with caution.
Factors influencing treatment with chemotherapy
More patients with ED SCLC have greatly impaired performance status at the time of diagnosis than patients with LD. Such patients have a poor prognosis and tolerate aggressive chemotherapy or combined-modality therapy poorly. Single-agent intravenous, oral, and low-dose biweekly regimens have been developed for these patients.[30,35,36,37,38,39,40,41]
Prospective, randomized studies have shown that patients with a poor prognosis who are treated with conventional regimens live longer than those treated with the single-agent, low-dose regimens or abbreviated courses of therapy. A study comparing chemotherapy every 3 weeks with treatment given as required for symptom control showed an improvement in QOL in those patients receiving regular treatment.[Level of evidence: 1iiDii]
Other studies have tested intensive one-drug or two-drug regimens. A study conducted by the Medical Research Council demonstrated similar efficacy for an etoposide plus vincristine regimen and a four-drug regimen. The latter regimen was associated with a greater risk of toxic effects and early death but was superior with respect to palliation of symptoms and psychological distress.[Level of evidence: 1iiC] Studies comparing a convenient oral treatment with single-agent oral etoposide versus combination therapy showed that the overall response rate and OS were significantly worse in the oral etoposide arm.[35,40][Level of evidence: 1iiA]
Subgroup analyses of phase II and phase III trials of SCLC patients by age showed that myelosuppression and doxorubicin-induced cardiac toxic effects were more severe in older patients than in younger patients and that the incidence of treatment-related death tended to be higher in older patients. About 80% of older patients, however, received optimal treatment, and their survival was comparable to that of younger patients. The standard chemotherapy regimens for the general population could be applied to older patients in good general condition (i.e., performance status of 0–1, normal organ function, and no comorbidity). There is no evidence of a difference in response rate, disease-free survival (DFS), or OS in older patients compared with younger patients.
Radiation therapy to sites of metastatic disease unlikely to be immediately palliated by chemotherapy, especially brain, epidural, and bone metastases, is a standard treatment option for patients with ED SCLC. Brain metastases are treated with whole-brain radiation therapy.
Chest radiation therapy is sometimes given for superior vena cava syndrome, but chemotherapy alone, with radiation reserved for nonresponding patients, is appropriate initial treatment. (Refer to the PDQ summary on Cardiopulmonary Syndromes for more information.)
Patients with ED treated with chemotherapy who have achieved a response can be considered for administration of PCI.
Combination chemotherapy and radiation therapy
Combination chemotherapy plus chest radiation therapy does not appear to improve survival compared with chemotherapy alone in patients with ED SCLC.
Treatment options under clinical evaluation for patients with ED SCLC include the following:
Check for U.S. clinical trials from NCI's list of cancer clinical trials that are now accepting patients with extensive stage small cell lung cancer. The list of clinical trials can be further narrowed by location, drug, intervention, and other criteria.
Standard Treatment Options for Patients With Recurrent Small Cell Lung Cancer (SCLC)
Standard treatment options for patients with recurrent SCLC include the following:
At the time of recurrence, many SCLC patients are potential candidates for further therapy.
Although second-line chemotherapy has been shown to produce tumor regression, responses are usually short lived; the median survival is rarely more than 12 months and usually less than 6 months after second-line therapy. Response to first-line chemotherapy predicts for subsequent response to second-line therapy.
As in other chemosensitive tumors (e.g., Hodgkin lymphoma and ovarian epithelial cancer), two main categories of patients receiving second-line chemotherapy have been described: sensitive and resistant. Sensitive patients have a first-line response that lasted more than 90 days after treatment was completed. These patients have the greatest benefit from second-line chemotherapy. Patients with sensitive disease respond to the same initial regimen in approximately 50% of cases; however, cumulative toxic effects may ensue. Resistant patients either did not respond to first-line chemotherapy or responded initially but relapsed within 90 days of completion of their primary therapy. Results from phase II studies of drugs such as topotecan, irinotecan, and gemcitabine indicate that response rates to agents vary depending on whether patients have sensitive, resistant, or refractory disease.[4,5,6,7,8][Level of evidence: 3iiiDii]
Topotecan is standard chemotherapy for recurrent SCLC. Patients with sensitive disease may achieve response to a number of agents including topotecan, irinotecan, taxanes, vinorelbine, paclitaxel, or gemcitabine.[4,5,6,7,8,9,10,11][Level of evidence: 3iiiDii] Response rates to combination agents are generally higher than those reported for single agents;[12,13] however, many studies do not report the patients with sensitive, resistant, or refractory disease.
Patients with central nervous system (CNS) recurrences can often obtain palliation of symptoms with additional chemotherapy and/or radiation therapy. A retrospective review showed that 43% of patients treated with additional chemotherapy at the time of CNS relapse responded to second-line chemotherapy. The majority of patients treated with radiation therapy obtain objective responses and improvement following radiation therapy.
Some patients with intrinsic endobronchial obstructing lesions or extrinsic compression caused by the tumor have achieved successful palliation with endobronchial laser therapy (for endobronchial lesions only) and/or brachytherapy. Expandable metal stents can be safely inserted under local anesthesia via the bronchoscope, which results in improved symptoms and pulmonary function in patients with malignant airways obstruction.
Patients with progressive intrathoracic tumor after failing initial chemotherapy can achieve significant tumor responses, palliation of symptoms, and short-term local control with external-beam radiation therapy. Only the rare patient, however, will experience long-term survival following salvage radiation therapy.
Treatment options under clinical evaluation for patients with recurrent SCLC include phase I and II clinical trials of new drugs.
Check for U.S. clinical trials from NCI's list of cancer clinical trials that are now accepting patients with recurrent small cell lung cancer. The list of clinical trials can be further narrowed by location, drug, intervention, and other criteria.
The PDQ cancer information summaries are reviewed regularly and updated as new information becomes available. This section describes the latest changes made to this summary as of the date above.
Editorial changes were made to this summary.
This summary is written and maintained by the PDQ Adult Treatment Editorial Board, which is editorially independent of NCI. The summary reflects an independent review of the literature and does not represent a policy statement of NCI or NIH. More information about summary policies and the role of the PDQ Editorial Boards in maintaining the PDQ summaries can be found on the About This PDQ Summary and PDQ NCI's Comprehensive Cancer Database pages.
Purpose of This Summary
This PDQ cancer information summary for health professionals provides comprehensive, peer-reviewed, evidence-based information about the treatment of small cell lung cancer. It is intended as a resource to inform and assist clinicians who care for cancer patients. It does not provide formal guidelines or recommendations for making health care decisions.
Reviewers and Updates
This summary is reviewed regularly and updated as necessary by the PDQ Adult Treatment Editorial Board, which is editorially independent of the National Cancer Institute (NCI). The summary reflects an independent review of the literature and does not represent a policy statement of NCI or the National Institutes of Health (NIH).
Board members review recently published articles each month to determine whether an article should:
Changes to the summaries are made through a consensus process in which Board members evaluate the strength of the evidence in the published articles and determine how the article should be included in the summary.
The lead reviewers for Small Cell Lung Cancer Treatment are:
Any comments or questions about the summary content should be submitted to Cancer.gov through the Web site's Contact Form. Do not contact the individual Board Members with questions or comments about the summaries. Board members will not respond to individual inquiries.
Levels of Evidence
Some of the reference citations in this summary are accompanied by a level-of-evidence designation. These designations are intended to help readers assess the strength of the evidence supporting the use of specific interventions or approaches. The PDQ Adult Treatment Editorial Board uses a formal evidence ranking system in developing its level-of-evidence designations.
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The preferred citation for this PDQ summary is:
National Cancer Institute: PDQ® Small Cell Lung Cancer Treatment. Bethesda, MD: National Cancer Institute. Date last modified <MM/DD/YYYY>. Available at: http://www.cancer.gov/cancertopics/pdq/treatment/small-cell-lung/healthprofessional. Accessed <MM/DD/YYYY>.
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Last Revised: 2014-08-06
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