|
In medicine, lung cancer staging is the assessment of the extent to which a lung cancer has spread from its original source. As with most cancers, staging is an important determinant of treatment and prognosis. In general, more advanced stages of cancer are less amenable to treatment and have a worse prognosis. The initial evaluation of non-small cell lung cancer staging uses the TNM classification. This is based on the size of the primary tumor, lymph node involvement, and distant metastasis. After this, using the TNM descriptors, a group is assigned, ranging from occult cancer, through stage 0, IA (one-A), IB, IIA, IIB, IIIA, IIIB to IV (four). This stage group assists with the choice of treatment and estimate of prognosis. There are several methods by which this assessment is made. They are broadly classified into ''non-invasive techniques'', which generally involve medical imaging of the lungs such as computer tomography (CT) scans and PET scans, and ''invasive techniques'' such as biopsy and surgery. Invasive techniques provide additional information because tissue samples can be seen microscopically to confirm presence of cancer cells (as opposed to enlargement of tissues due to other causes such as infection) and to determine the type of lung cancer and its grade. Staging may also be categorized as either clinical or as pathological/surgical staging. Clinical staging is performed prior to definitive surgery. It is based on the results of imaging studies (such as CT scans ) and biopsy results (i.e. clinical staging does include the results of biopsy, an "invasive technique.") Pathological staging is also called surgical staging and reflects not only the results of non-surgical biopsy, but is evaluated either intra- or post-operatively and is based on the combined results of surgical and clinical findings, including surgical sampling of thoracic lymph nodes.〔Lu Charles, Onn A, Vaporciyan AA et al. Holland-Frei Cancer Medicine. 8th edition. Chapter 78: Cancer of the Lung. People's Medical Publishing House, USA (2010) ISBN 9781607950141〕 ==Lung cancer== (詳細はtobacco smoke. Lung cancer in non-smokers, who account for approximately 15% of cases, is often attributed to a combination of genetic factors, radon gas, asbestos, and air pollution. The main types of lung cancer are non-small cell lung carcinoma and small cell lung carcinoma, the two being distinguished histologically as well as by how they are treated; non-small cell lung carcinoma is primarily treated with surgery if feasible, while small cell lung carcinoma is more frequently treated with chemotherapy and radiation. The diagnosis of lung cancer is based on chest radiograph and computer tomography (CT) scans, and is confirmed by biopsy. Biopsy is usually performed via bronchoscopy or CT-guided biopsy. Treatment and prognosis depend upon the histological type of cancer, the stage, and the patient's performance status. Treatments include surgery, chemotherapy, and radiotherapy. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Lung cancer staging」の詳細全文を読む スポンサード リンク
|