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Epidemiology of Lung Cancer PowerPoint Presentation

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Slide 1 - ppt slide no 1 content not found
Slide 2 - Most frequently diagnosed cancer worldwide About 1.35 million new cases diagnosed worldwide each year Leading cause of cancer deaths in the United States
Slide 3 - ppt slide no 3 content not found
Slide 4 - Incidence and mortality rates begin to increase between the ages of 45 and 54 and rise progressively until age 75 Median age at diagnosis=70.07 Median age at death=71.07
Slide 5 - Males have a greater lifetime risk of lung cancer than females (7.81% vs. 5.8%) Greater disparity in developing countries where cigarette use by females is low
Slide 6 - African-Americans have the highest incidence and mortality, Hispanics have the lowest
Slide 7 - Patterns of mortality tend to cluster with in areas with high prevalence of cigarette smoking In the US, highest rates in Kentucky, lowest in Utah Number of cases highest in California, lowest in Alaska Worldwide, most cases are seen in the developed countries of North America, Western Europe, and Australia/New Zealand
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Slide 9 - Current overall 5 year survival rate is 11% Impacted by age, tumor stage, histological subtype, and treatment Developed countries have higher survival rates than developing countries (13% vs. 9%) Improvements in diagnostic and therapeutic technologies have contributed to an increase in survival 1 year survival 37% in 1975, 42% in 2000
Slide 10 - Higher incidence and mortality rates are reported among men from lower SES groups
Slide 11 - Cigarette smoking is the most important risk factor for lung cancer Causes approximately 90% of male and 75-80% of female lung cancer deaths By the early 1950s, case control studies in the US and Great Britain clearly showed an association between smoking and lung cancer In 1964, the US Surgeon General released a report on the causal relationship
Slide 12 - United Kingdom Cumulative risk of death from lung cancer rose from 6% in 1950 to 16% in 1990 in male cigarette smokers Relative risk of lung cancer after smoking cessation begins to decrease after 5 years but never reaches the risk of a non-smoker
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Slide 14 - More than 80 carcinogens in cigarette smoke according to the International Agency for Research on Cancer (IARC) Polycyclic aromatic hydrocarbons (PAHs) are a well documented lung carcinogen NNK has been shown to induce lung carcinoma
Slide 15 - History of respiratory diseases such as asthma, bronchitis, emphysema, hay fever, or pneumonia may modify risk When combined with smoking, there is a complementary cycle of injury and repair that may increase risk Respiratory diseases may result in chronic immune stimulation that causes random pro-oncogenic mutations that increase risk Relationship is still speculative
Slide 16 - Animal models have indicated that dietary fat can promote chemically induced pulmonary tumors Relationship may be confounded by the association between smoking status and diet Rates of lung cancer are highest in countries with greatest fat consumption after controlling for smoking
Slide 17 - Lowered risk associated with consumption of fresh vegetables and fruits Case-control and cohort studies Risk in those with highest intake was about one-half of those with lowest intake Beneficial micronutrients in fruits and vegetables Carotenoids Isothiocyanates Folate Selenium
Slide 18 - Difficult to assess association between alcohol and lung cancer due to confounding by smoking status Conflicting results of cohort and case-control studies
Slide 19 - IARC categorized several occupational agents as known carcinogens Radon Well established lung carcinogen, responsible for 6.5% of lung cancer deaths in the United Kingdom in 1998 Asbestos SMR for lung cancer= 1.65, dose dependent risk Arsenic Bischloromthyl ether Chromium Nickel Polycyclic aromatic compounds Vinyl chloride
Slide 20 - Only a fraction of long-term smokers will develop lung cancer Likely impacted by genetic susceptibility Familial aggregation Studies have reported an excess of lung cancer mortality in relatives of lung cancer patients
Slide 21 - Polymorphisms in genes encoding for enzymes responsible for detoxification of carcinogens affect the internal dose of tobacco carcinogens that lung tissue is exposed to Many different polymorphisms Cytochrome P-450
Slide 22 - Defective repair of genetic damage is an important determinant of susceptibility to lung cancer Hypersensitivity to carcinogenic exposure Many studies have demonstrated that cancer cases have a significant decrease in DNA repair capacity compared to controls
Slide 23 - Genes Involved in Methyl Metabolism Cell Cycle Control
Slide 24 - Prevent smoking Screening Early detection improves resectability and survival Methods Low-dose spiral CT Combination of chest X-rays and sputum cytology May only be cost-effective in high-risk populations
Slide 25 - Correlating biomarkers from surrogate tissues with molecular changes in lung tissue Markers should be readily accessible (blood) Provide non-invasive evaluation of risk, physiologic and pathophysicological states Chemoprevention and chemotherapy
Slide 26 - Cancer Epidemiology, 3rd ed. 2006. Oxford University Press Centers for Disease Control American Cancer Society
Slide 27 - Review Questions (Developed by the Supercourse team) Why do you think lung cancer is the most frequently diagnosed cancer worldwide? What is the reason for geographic variation in the rates of lung cancer? Describe factors contributing to lung cancer development, other than smoking. If somebody quits smoking, does the risk of cancer development return to the level of non-smoker? Describe the pattern.
 

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