World Burden of Cancer Epi 242 Cancer Epidemiology Binh Goldstein, Ph.D. October 7, 2009.
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Transcript of World Burden of Cancer Epi 242 Cancer Epidemiology Binh Goldstein, Ph.D. October 7, 2009.
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World Burden World Burden of Cancerof Cancer
Epi 242 Cancer EpidemiologyEpi 242 Cancer Epidemiology
Binh Goldstein, Ph.D.Binh Goldstein, Ph.D.
October 7, 2009October 7, 2009
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Measures of Cancer Frequency: Measures of Cancer Frequency: IncidenceIncidence
number of new cases occurringnumber of new cases occurring can be expressed as an absolute number can be expressed as an absolute number
of cases per year or as a rate per 100,000 of cases per year or as a rate per 100,000 persons per year.persons per year.
incidence rate provides approximation to incidence rate provides approximation to average risk of developing a cancer and is average risk of developing a cancer and is necessary to compare risk of disease necessary to compare risk of disease between populations between populations
reduction in incidence is the appropriate reduction in incidence is the appropriate statistics to use when considering impact statistics to use when considering impact of primary prevention strategiesof primary prevention strategies
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Measures of Cancer Frequency: Measures of Cancer Frequency: MortalityMortality
number of deaths occurringnumber of deaths occurring mortality rate is the number of deaths mortality rate is the number of deaths
per 100,000 persons per yearper 100,000 persons per year mortality rates measure average risk of mortality rates measure average risk of
dying from a specific cancerdying from a specific cancer number of deaths is one measure of number of deaths is one measure of
outcome or impact of canceroutcome or impact of cancer Fatality, (1-survival), is probability that Fatality, (1-survival), is probability that
an individual with cancer will die from an individual with cancer will die from it and is generally assumed to be most it and is generally assumed to be most severe sequelae of diseasesevere sequelae of disease
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Measures of Cancer Frequency: Measures of Cancer Frequency: PrevalencePrevalence
NO agreed definition of “prevalence” of cancer NO agreed definition of “prevalence” of cancer number of persons in a defined population alive at number of persons in a defined population alive at
a given time who have had cancer diagnosed at a given time who have had cancer diagnosed at some time in pastsome time in past
partial prevalence limits number of patients to partial prevalence limits number of patients to those diagnosed during fixed time in past and is those diagnosed during fixed time in past and is more useful prevalence measure of cancer burdenmore useful prevalence measure of cancer burden
prevalence for cases diagnosed within 1, 3, 5 prevalence for cases diagnosed within 1, 3, 5 years are likely to be of relevance to different years are likely to be of relevance to different stages of cancer therapy: initial treatment (1 stages of cancer therapy: initial treatment (1 year), clinical follow-up (3 years) and cure (5 year), clinical follow-up (3 years) and cure (5 years)years)
patients still alive 5 years after diagnosis are patients still alive 5 years after diagnosis are considered “cured” since their death rates are considered “cured” since their death rates are similar to general population (some exceptions, similar to general population (some exceptions, like breast cancer)like breast cancer)
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Other Measurements: SurvivalOther Measurements: Survival
survival time defined as time that elapsed survival time defined as time that elapsed between diagnosis and deathbetween diagnosis and death
most basic measure of patients’ survival is most basic measure of patients’ survival is the observed survivalthe observed survival
5-year observed survival is percentage of 5-year observed survival is percentage of patients alive after 5 years of follow-up patients alive after 5 years of follow-up from date of diagnosisfrom date of diagnosis
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Other Measurements: Relative Other Measurements: Relative SurvivalSurvival
deaths from other competing causes will deaths from other competing causes will lower the observed survival rates and lower the observed survival rates and preclude comparison between groups preclude comparison between groups where probability of death in the general where probability of death in the general population varypopulation vary
relative survival rate can be calculated to relative survival rate can be calculated to avoid this problemavoid this problem
relative survival rate is observed survival relative survival rate is observed survival rate in a patient group divided by expected rate in a patient group divided by expected survival of a comparable group in the survival of a comparable group in the general population with respect to age, general population with respect to age, sex, and calendar period of investigationsex, and calendar period of investigation
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Measures of Cancer FrequencyMeasures of Cancer Frequency
How are the different measures How are the different measures related?related?
• M = I x F, where F is fatalityM = I x F, where F is fatality• M ≈ I(1-S), where S is 5-year survivalM ≈ I(1-S), where S is 5-year survival• P = I x D, where D is durationP = I x D, where D is duration• F = (1-S)F = (1-S)
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Other Measurements of BurdenOther Measurements of Burden
PYLLs (Potential Years of Life Lost)PYLLs (Potential Years of Life Lost) QALYs (Quality Adjusted Life Years)QALYs (Quality Adjusted Life Years) DALYs (Disability Adjusted Life Years)DALYs (Disability Adjusted Life Years)
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Global Cancer StatisticsGlobal Cancer Statistics
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Incidence by sex and cancer site, World 2002Incidence by sex and cancer site, World 2002
Source: Table 1: Parkin DM, et al. CA Cancer J Clin [2005]; 55: 74-108
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Mortality by sex and cancer site, World 2002Mortality by sex and cancer site, World 2002
Source: Table 1: Parkin DM, et al. CA Cancer J Clin [2005]; 55: 74-108
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Estimated Age-adjusted Survival (%)Estimated Age-adjusted Survival (%)
Source: Table 2: Parkin DM, et al. CA Cancer J Clin [2005]; 55: 74-108
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Incidence and prevalent cases, Incidence and prevalent cases, World 2002World 2002
Source: Figure 3: Parkin DM, et al. CA Cancer J Clin [2005]; 55: 74-108
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The Major CancersThe Major Cancers
Lung (ICD-10 C33 and C34)Lung (ICD-10 C33 and C34) Breast (female, C50)Breast (female, C50) Colon/rectum (C18-C20)Colon/rectum (C18-C20) Stomach (C16)Stomach (C16) Prostate (C61)Prostate (C61) Liver (C22)Liver (C22) Cervix uteri (C53)Cervix uteri (C53) Esophagus (C15)Esophagus (C15)
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USUSMore developed More developed
countriescountriesLess developed Less developed
countriescountries
SiteSite MalesMales FemalesFemales MalesMales FemalesFemales MalesMales FemalesFemales
LungLung 61.961.9 36.136.1 54.954.9 17.017.0 25.925.9 9.49.4
BreastBreast ── 101.1101.1 ── 67.867.8 ── 23.823.8
Colon/RectumColon/Rectum 44.644.6 33.133.1 40.040.0 26.626.6 10.210.2 7.77.7
StomachStomach 7.27.2 3.33.3 22.3*22.3* 10.0*10.0* 21.521.5 10.410.4
LiverLiver 5.55.5 2.02.0 8.58.5 3.03.0 18.418.4 7.17.1
ProstateProstate 124.8124.8 ── 56.256.2 ── 9.49.4 ──
CervixCervix ── 7.77.7 ── 10.310.3 ── 19.119.1
EsophagusEsophagus 5.95.9 1.31.3 6.86.8 1.31.3 13.713.7 6.56.5
Age Standardized Incidence RatesAge Standardized Incidence Rates
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World Age Standardized World Age Standardized Incidence and Mortality RatesIncidence and Mortality Rates
IncidenceIncidence MortalityMortality
MalesMales FemalesFemales MalesMales FemalesFemales
LungLung 35.535.5 12.112.1 31.231.2 10.310.3
BreastBreast ── 37.537.5 ── 13.213.2
Colon/RectumColon/Rectum 20.120.1 14.614.6 10.210.2 7.67.6
StomachStomach 22.022.0 10.310.3 16.316.3 7.97.9
LiverLiver 15.715.7 5.85.8 14.914.9 5.75.7
ProstateProstate 25.325.3 ── 8.28.2 ──
CervixCervix ── 16.216.2 ── 9.09.0
EsophagusEsophagus 11.511.5 4.74.7 9.69.6 3.93.9
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Lung cancerLung cancer
1.35 million new cases and 1.18 million 1.35 million new cases and 1.18 million deaths worldwide estimated in 2002deaths worldwide estimated in 2002
50% new cases occurred in more 50% new cases occurred in more developed countries (previously 69%)developed countries (previously 69%)
more common in males (2.9 male:female more common in males (2.9 male:female ratio)ratio)
patterns of lung cancer occurrence patterns of lung cancer occurrence determined largely by past exposure to determined largely by past exposure to tobacco smoking tobacco smoking
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Age-standardized incidence rates for Age-standardized incidence rates for lung cancer lung cancer
Source: Figure 5: Parkin DM, et al. CA Cancer J Clin [2005]; 55: 74-108
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Lung cancer Lung cancer incidence trendsincidence trends
in countries where in countries where smoking was first smoking was first established (UK, US, established (UK, US, Australia, etc.), rates Australia, etc.), rates declining among declining among menmen
in most other in most other countries, rates countries, rates risingrising
rates in women rates in women generally increasing generally increasing since tobacco habit since tobacco habit is fairly recent, is fairly recent, except in countries except in countries where their smoking where their smoking prevalence is prevalence is decliningdeclining
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Lung cancer Lung cancer mortality trendsmortality trends
similar to incidence similar to incidence trendstrends
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Breast cancerBreast cancer 1.15 million new cases and 410,000 1.15 million new cases and 410,000
deaths worldwide estimated in 2002deaths worldwide estimated in 2002 most common cancer in womenmost common cancer in women Over half of new cases occurred in more Over half of new cases occurred in more
developed countriesdeveloped countries stage of disease at diagnosis is most stage of disease at diagnosis is most
important prognostic factor important prognostic factor most prevalent cancer in world because of most prevalent cancer in world because of
its good prognosesits good prognoses risk increases with age but slows at about risk increases with age but slows at about
50 years because of menopause and lower 50 years because of menopause and lower estrogen levelsestrogen levels
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Age-standardized incidence and Age-standardized incidence and mortality rates for breast cancermortality rates for breast cancer
Source: Figure 6: Parkin DM, et al. CA Cancer J Clin [2005]; 55: 74-108
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Breast cancer Breast cancer incidence trendsincidence trends
generally increasing generally increasing at all agesat all ages
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Breast cancer Breast cancer mortality trendsmortality trends
may be declining may be declining in recent years in recent years (like in US, (like in US, Canada, and some Canada, and some European European countries) due to countries) due to screening and screening and detection of early detection of early stage cancers and stage cancers and more effective more effective treatmenttreatment
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Colorectal cancerColorectal cancer
About 1 million new cases and 529,000 About 1 million new cases and 529,000 deaths worldwide estimated in 2002deaths worldwide estimated in 2002
33rdrd most common cause of cancer in world most common cause of cancer in world but 2but 2ndnd most common in developed most common in developed countries.countries.
good prognoses (40-50% 5-year survival) good prognoses (40-50% 5-year survival) makes it the 2makes it the 2ndnd most prevalent cancer most prevalent cancer
males and females have similar ratesmales and females have similar rates
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Age-standardized incidence rates for Age-standardized incidence rates for colorectal cancer colorectal cancer
Source: Figure 7: Parkin DM, et al. CA Cancer J Clin [2005]; 55: 74-108
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Colorectal cancer Colorectal cancer incidence trendsincidence trends
increasing trend in increasing trend in low-risk areaslow-risk areas
stabilized or stabilized or decreasing trends in decreasing trends in high-risk areashigh-risk areas
greatest increases greatest increases observed in Asia observed in Asia (especially Japan) (especially Japan) and Eastern Europe and Eastern Europe (possibly from (possibly from “westernization” of “westernization” of lifestyle/diet)lifestyle/diet)
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Colorectal cancer Colorectal cancer mortality trendsmortality trends
decreasing trend in decreasing trend in developed countries developed countries may be due to may be due to decreasing in decreasing in incidence, improved incidence, improved treatment, and treatment, and improvements in improvements in early detection (from early detection (from screening)screening)
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Stomach cancerStomach cancer
934,000 new cases and 700,000 deaths 934,000 new cases and 700,000 deaths worldwide estimated in 2002worldwide estimated in 2002
ranked 4ranked 4thth in number of new cancers but in number of new cancers but 22ndnd in most common cause of deaths from in most common cause of deaths from cancercancer
almost two-thirds of cases occur in almost two-thirds of cases occur in developing countriesdeveloping countries
more common in males (1.75 male:female more common in males (1.75 male:female ratio)ratio)
however, in younger age groups (<40 however, in younger age groups (<40 years) rates in women are greater than years) rates in women are greater than men men
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Age-standardized incidence rates for Age-standardized incidence rates for stomach cancer stomach cancer
Source: Figure 8: Parkin DM, et al. CA Cancer J Clin [2005]; 55: 74-108
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Stomach cancer Stomach cancer incidence trendsincidence trends
general decline in general decline in rates among both rates among both developed and developed and developing countries developing countries because of improved because of improved food preservation food preservation practices practices (refrigerators) and (refrigerators) and better nutrition better nutrition (higher vegetable (higher vegetable and fruit intake)and fruit intake)
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Stomach cancer Stomach cancer mortality trendsmortality trends
generally declining in generally declining in both less and more both less and more developed regionsdeveloped regions
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Prostate cancerProstate cancer
679,000 new cases and 221,000 deaths 679,000 new cases and 221,000 deaths worldwide estimated in 2002worldwide estimated in 2002
22ndnd most common new cancer and most most common new cancer and most prevalent form of cancer among malesprevalent form of cancer among males
75% of cases occur in men aged 65+75% of cases occur in men aged 65+ prostate-specific antigen assay introduced prostate-specific antigen assay introduced
in mid to late ‘80sin mid to late ‘80s
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Age-standardized incidence rates for Age-standardized incidence rates for prostate cancer prostate cancer
Source: Figure 5: Parkin DM, et al. CA Cancer J Clin [2005]; 55: 74-108
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Prostate cancer Prostate cancer incidence trendsincidence trends
in many developed in many developed countries incidence countries incidence increased greatly, increased greatly, especially among especially among younger men (<65 younger men (<65 yrs)yrs)
most dramatic most dramatic increases are in increases are in high-risk areas high-risk areas partly due to partly due to detection of detection of prevalent latent prevalent latent cancers using PSAcancers using PSA
less developed less developed countries also countries also increasingincreasing
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Prostate cancer Prostate cancer mortality trendsmortality trends
generally increasing generally increasing but not as but not as dramatically as dramatically as incidenceincidence
since 1990s, decline since 1990s, decline in several developed in several developed countries attributed countries attributed to earlier detection to earlier detection and improved and improved treatmenttreatment
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Liver cancerLiver cancer
626,000 new cases and 598,000 deaths 626,000 new cases and 598,000 deaths worldwide estimated in 2002worldwide estimated in 2002
66thth most common cancer and 3 most common cancer and 3rdrd most most common cause of deaths from cancercommon cause of deaths from cancer
82% of cases occur in developing 82% of cases occur in developing countries (55% in China)countries (55% in China)
male:female ratio is about 2.4 male:female ratio is about 2.4
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Age-standardized incidence rates for Age-standardized incidence rates for liver cancer liver cancer
Source: Figure 10: Parkin DM, et al. CA Cancer J Clin [2005]; 55: 74-108
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Liver cancer incidence Liver cancer incidence trendstrends
difficult to interpret difficult to interpret because of ICD because of ICD revisionsrevisions• 77thth revision includes gall revision includes gall
bladder cancerbladder cancer• 99thth revision includes revision includes
category of “unspecified category of “unspecified 110 0 or 2or 200””
↓ ↓ among Chinese among Chinese because of because of ↓↓ in in prevalence of HBVprevalence of HBV
↑↑ in Japan because of in Japan because of ↑ ↑ alcohol consumption alcohol consumption and HCV prevalenceand HCV prevalence
↑ ↑ in developed in developed countries possibly countries possibly from from ↑ ↑ HCV infection HCV infection (from transfusions and (from transfusions and drug use)drug use)
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Liver cancer Liver cancer mortality trendsmortality trends
similar to incidence similar to incidence trendstrends
increase in mortality increase in mortality among developed among developed countries not countries not necessarily from necessarily from alcohol (since alcohol (since mortality from liver mortality from liver cirrhosis is cirrhosis is decreasing)decreasing)
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Cervical cancerCervical cancer 493,000 new cases and 274,000 deaths 493,000 new cases and 274,000 deaths
worldwide estimated in 2002worldwide estimated in 2002 22ndnd most common new cancer among most common new cancer among
womenwomen 83% of cases occur in developing 83% of cases occur in developing
countriescountries rates are very low in developed countriesrates are very low in developed countries generally, incidence rises at age 20-29 and generally, incidence rises at age 20-29 and
peaks around 45-49 in developed peaks around 45-49 in developed countries, but usually later in developing countries, but usually later in developing countries countries
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Age-standardized incidence and Age-standardized incidence and mortality rates for cervical cancer mortality rates for cervical cancer
Source: Figure 11: Parkin DM, et al. CA Cancer J Clin [2005]; 55: 74-108
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Cervical cancer Cervical cancer incidence trendsincidence trends
decreases in many decreases in many developed countries developed countries because of because of screening programsscreening programs
in developing in developing countries, trends countries, trends vary, but generally, vary, but generally, rates (including rates (including mortality) are mortality) are stabilized or stabilized or decreasingdecreasing
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Cervical cancer Cervical cancer mortality trendsmortality trends
decreases in many decreases in many developed countries developed countries also because of also because of diagnoses at earlier diagnoses at earlier stages and improved stages and improved treatmenttreatment
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Esophageal cancerEsophageal cancer
462,000 new cases and 386,000 deaths 462,000 new cases and 386,000 deaths worldwide estimated in 2002worldwide estimated in 2002
84% of cases occur in developing countries84% of cases occur in developing countries generally, more common in males generally, more common in males
(male:female ratio over 2), but female (male:female ratio over 2), but female predominance in some areas of predominance in some areas of “esophageal cancer belt”“esophageal cancer belt”
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Age-standardized incidence rates for Age-standardized incidence rates for esophageal cancer esophageal cancer
Source: Figure 12: Parkin DM, et al. CA Cancer J Clin [2005]; 55: 74-108
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Esophageal cancer Esophageal cancer incidence trendsincidence trends
trends vary from trends vary from increasing (Eastern increasing (Eastern Europe and US), Europe and US), stabilized (Southern stabilized (Southern Europe), to decreasing Europe), to decreasing (Finland and China)(Finland and China)
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Esophageal cancer Esophageal cancer mortality trendsmortality trends
inconsistent trends inconsistent trends like incidencelike incidence
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ResourcesResources Garcia M, et al. Global Cancer Facts & Garcia M, et al. Global Cancer Facts &
Figures 2007, American Cancer Society, Figures 2007, American Cancer Society, 2007.2007.
Ferlay J, et al. GLOBOCAN 2002 Database. Ferlay J, et al. GLOBOCAN 2002 Database. Descriptive Epidemiology Group, Descriptive Epidemiology Group, International Agency for Research on International Agency for Research on Cancer, 2002.Cancer, 2002.
Parkin DM, et al. Global Cancer Statistics, Parkin DM, et al. Global Cancer Statistics, 2002. 2002. CA Cancer J Clin, CA Cancer J Clin, 2005; 55: 74-108.2005; 55: 74-108.
Parkin DM, et al. Cancer burden in the Parkin DM, et al. Cancer burden in the year 2000. The global picture. year 2000. The global picture. Eur J Eur J Cancer, Cancer, 2001; 37 Suppl 8: S4-66. 2001; 37 Suppl 8: S4-66.