lung carcinoma
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Lung Carcinoma6
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Carcinoma of the Lung
• In United States:-
• 6.5 % of all deaths & 29% of cancer -related death.
• #1 cause of cancer deaths in males & females– 31% of male cancer deaths in 2008– 26% of female cancer deaths
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Annual Age-adjusted Cancer Death Rates for Selected Cancers, United States, 1930-2004
MalesFemales
CA Cancer J Clin 2008;58:81-82
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Smoking-related diseases
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Causes of Lung Cancer
• 85-90% smoking • Industrial hazards :- Asbestos , Uranium Rare arsenic, chromium, mustard gas, nickel,
vinyl chloride .• Air pollution :- Radon• Molecular genetics:- KRAS, c-MYC,EGFR,
p53
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Classification of Lung Carcinoma (Major Types)
Non-Small Cell Carcinoma:
- Adenocarcinoma 42%
- Squamous cell carcinoma 28%
- Large cell carcinoma 14%
Small cell carcinoma 16%
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Precursor lesions:-(1)Squamous dysplasia & Ca.in situ.(2)Atypical adenomatous hyperplasia.(3)Diffuse idiopathic pulmonary neuroendocrine hyperplasia.
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Adenocarcinoma
• Frequency: 42%• Smoking: X 3 (increased risk)• Males < females• Survival (5 years): 15 - 20%• Peripheral
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Adenocarcinoma
• Malignant epithelial tumors with tubular, acinar, or papillary growth patterns, and/or mucus production by the tumor cells.
• Adenocarcinoma is the predominant histological subtype of lung carcinoma in most countries (40-50% of all cases).
• Most prevalent form of lung cancer in younger males (<50 yr) and in women of all ages, in never smokers, and in former smokers
• Adenocarcinoma has flipped with squamous tumors as most common over the past 20 years. Why? Thought that smoking with filters, light tobacco, profound inhalation favor the development of distal bronchiolar and alveolar adenocarcinomas
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AdenocarcinomaBronchioloalveolar type
• Frequency: 2 %• Smoking: yes• Males = females• Survival (5 years): 25 a 40 %.• Presentation:
– Single or multiple tumor nodules– Miliary tumor– “Pneumonic form”
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Bronchioalveolar carcinoma – Mucinous type
Pneumonic presentation (40%) – Poor prognosis
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1. Definition: noninvasive tumors with bland cytology and lepidic spread (line alveolar surfaces)
2. New proposal to classify these as “adenocarcinoma in situ” or atypical adenomatous hyperplasia
AdenocarcinomaBronchioloalveolar type
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Squamous cell carcinoma
• Frequency: 28%• Smoking: X 25 (increased risk)• Males > females• Survival (5 years): 15 - 20%• Arises in bronchial squamous
metaplasia• Centrally located• May cavitate
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Squamous cell carcinoma
• Malignant epithelial tumor with morphologic evidence of keratinization, intercellular bridges or both.
• Second most common type of lung cancer.
• 2/3 central 1/3 peripheral.
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Squamous cell carcinoma
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Squamous cell carcinoma
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Large Cell Carcinoma• Frequency: 14%
• Gross– Peripheral lesion
• Microscopic– group of tumors that do not fit the criteria of a
squamous cell carcinoma, adenocarcinoma, or small cell carcinoma
• Prognosis– Similar to adenocarcinoma
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Small cell carcinoma
• Frequency: 16%• Smoking: 95% of patients• Survival (5 years): 1 - 5 %
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• Malignant epithelial tumor consisting of small cells with minimal/scant cytoplasm, finely granular nuclear chromatin, absent or inconspicuous nucleoli, displaying prominent nuclear molding, high mitotic/apoptotic activity and extensive necrosis
• Highly associated with cigarette smoking, central location, early spread, common paraneoplastic syndromes
Small cell carcinoma
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Small cell carcinoma
• Still a dismal lesion: over 75% of cases present with stage III or IV disease
• In many series long term survival is less than 5%
• Takes one importance because it essentially removes a patient from consideration of resection in most cases
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Presenting Symptoms of Lung Cancer
• Potentially curable– asymptomatic– cough– hemoptysis
• Usually incurable– dyspnea & chest pain– anorexia & weight loss– hoarseness– bone pain– Horner’s syndrome (Pancoast tumor)
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Bronchogenic carcinoma + bronchectasis.
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Mesothelioma• Mesothelioma:
– Malignant tumor of mesothelial cells
– Highly malignant neoplasm with short survival
– Most patients (70%) have an asbestos exposure history
• Asbestos exposure also increases the risk of pulmonary cancer
• Smoking is not related to mesothelioma