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Dr. Jemal is Program Director, Cancer Occurrence, Department of Epidemiology and Surveillance Research, American Cancer Society, Atlanta, GA.
Mr. Murray is Manager, Surveillance Data Systems, Department of Epidemiology and Surveillance Research, American Cancer Society, Atlanta, GA.
Dr. Ward is Director, Surveillance Research, Department of Epidemiology and Surveillance Research, American Cancer Society, Atlanta, GA.
Ms. Samuels is Manager, Surveillance Information Services, Department of Epidemiology and Surveillance Research, American Cancer Society, Atlanta, GA.
Dr. Tiwari is Mathematical Statistician, Statistical Research and Applications Branch, Division of Cancer Control and Population Sciences, National Cancer Institute, Rockville, MD.
Ms. Ghafoor is Epidemiologist, Department of Epidemiology and Surveillance Research, American Cancer Society, Atlanta, GA.
Dr. Feuer is Branch Chief, Statistical Research and Applications Branch, Division of Cancer Control and Population Sciences, National Cancer Institute, Rockville, MD.
Dr. Thun is Vice-President, Department of Epidemiology and Surveillance Research, American Cancer Society, Atlanta, GA.
| ABSTRACT |
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| INTRODUCTION |
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| MATERIALS AND METHODS |
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Estimated New Cancer Cases
The precise number of cancer cases diagnosed each year in the nation and in every state is unknown because complete cancer registration has not yet been achieved in many states. Consequently, for the national estimate we first estimated the number of new cancer cases occurring annually in the United States from 1979 through 2001 using age-specific cancer incidence rates collected by the SEER program2 and population data reported by the US Census Bureau.6 We then forecasted the number of cancer cases expected to be diagnosed in the United States in the year 2005 using an autoregressive quadratic time-trend model fitted to the annual cancer case estimates.11 For estimates of new cancer cases in individual states, we projected the number of deaths from cancer in each state in 2005 and assumed that the ratio of estimated cancer deaths to cases in each state equaled that in the United States.
Estimated Cancer Deaths
We used the state-space prediction method12 to estimate the number of cancer deaths expected to occur in the United States and in each state in the year 2005. Projections are based on underlying cause of death from death certificates as reported to the NCHS.1 This model projects the number of cancer deaths expected to occur in 2005 based on the number that occurred each year from 1969 to 2002 in the United States and in each state separately.
Other Statistics
We provide mortality statistics for the leading causes of death as well as deaths from cancer in the year 2002. Causes of death for 2002 were coded and classified according to ICD-10.7 This report also provides updated statistics on trends in cancer incidence and mortality rates, the probability of developing cancer, and 5-year relative survival rates for selected cancer sites based on data from 1973 through 2001.3 All age-adjusted incidence and death rates are standardized to the 2000 US standard population and expressed per 100,000 population.
The long-term incidence trends (1975 to 2001) presented in Table 4 are adjusted for delays in reporting. Delayed reporting affects the most recent 1 to 3 years of incidence data (in this case, 1999 to 2001), especially for cancers such as melanoma and prostate cancer that are frequently diagnosed in outpatient settings. The NCI has developed a method to account for expected reporting delays in SEER registries for all cancer sites combined and several specific cancer sites when long-term incidence trends are analyzed.13 Delay-adjusted trends provide a more accurate assessment of trends in the most recent years for which data are available.
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| SELECTED FINDINGS |
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Figure 1 indicates the most common cancers expected to occur in men and women in 2005. Among men, cancers of the prostate, lung and bronchus, and colon and rectum account formore than 56% of all newly diagnosed cancers. Prostate cancer alone accounts for approximately 33% (232,090) of incident cases in men. Based on cases diagnosed between 1995 and 2000, about 90% of these estimated new cases of prostate cancer are expected to be diagnosed at local or regional stages, for which 5-year relative survival approaches 100%.
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The three most commonly diagnosed cancers among women in 2005 will be cancers of the breast, lung and bronchus, and colon and rectum, accounting for approximately 55% of estimated cancer cases in women. Breast cancer alone is expected to account for 32% (211,240) of all new cancer cases among women.
Expected Number of New Cancer Deaths
Table 1 also shows the expected number of cancer deaths in 2005 for men, women, and both sexes combined. It is estimated that approximately 570,280 Americans will die from cancer, corresponding to more than 1,500 deaths per day. Cancers of the lung and bronchus, prostate, and colon and rectum in men and cancers of the lung and bronchus, breast, and colon and rectum in women continue to be the most common fatal cancers. These four cancers account for one-half of the total cancer deaths among men and women (Figure 1). Lung cancer surpassed breast cancer as the leading cause of cancer death in women in 1987. Lung cancer is expected to account for 27% of all female cancer deaths in 2005. Table 3 provides the estimated number of cancer deaths in 2005 by state for selected cancer sites.
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Trends in Cancer Incidence and Mortality
Figures 2 through 5![]()
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depict long-term trends in cancer incidence and death rates for all cancers combined and for selected cancer sites by sex. Table 4 shows incidence and mortality patterns for all cancer sites and for the four most common cancer sites based on joinpoint analysis. Trends in incidence were adjusted for delayed reporting in the table (joinpoint analysis) but not in the figures (Figures 2 and 3
). Death rates from all cancers combined decreased by 1.5% per year from 1993 to 2001 in males and by 0.8% per year in females from1992 to 2001 (Table 4). Delay-adjusted cancer incidence rates stabilized in men from 1995 to 2001 and increased by 0.3% per year from 1987 to 2001 in women (Table 4).
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Mortality rates have continued to decrease across all four major cancer sites in men and in women except for female lung cancer in which rates have leveled off for the first time after increasing for many decades (Table 4). The incidence trends are mixed, however. Lung cancer incidence rates are declining in men and leveled off for the first time in women after increasing for many decades. Colorectal cancer incidence rates have decreased from 1998 through 2001 both in males and in females. The incidence rates of prostate cancer and female breast cancer have continued to increase, although at a slower rate than in previous years. The continuing increase may be attributable to increased screening through prostate-specific antigen testing (for prostate cancer) and mammography (for breast cancer). The increase in female breast cancer incidence may also reflect increased use of hormone replacement therapy and/or increased prevalence of obesity.14
Changes in the Recorded Number of Deaths From Cancer From 2001 to 2002
A total of 557,271 cancer deaths were recorded in the United States in 2002, the most recent year for which actual data are available. More than 3,500 additional cancer deaths were recorded in 2002 than in 2001, predominantly because of growth and aging of the population. Cancer accounted for approximately 23% of all deaths, ranking second only to heart disease (Table 5). When age-adjusted death rates are considered (Figure 6), cancer is the leading cause of death among men and women under age 85. A total of 476,009 people under age 85 died from cancer in the United States in 2002 compared with 450,637 deaths from heart disease. When cause of death is ranked within each age group, categorized in 20-year age intervals, cancer is one of the five leading causes of death in each age group among both males and females. Cancer is the leading cause of death among women aged 40 to 79 and among men aged 60 to 79 (Table 6).
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Table 7 presents the number of deaths from all cancers combined and the five most common cancer sites for males and females at various ages. Among men under age 40, leukemia is the most common fatal cancer, while cancer of the lung and bronchus predominates in men aged 40 years and older. Colorectal cancer is the second most common cause of cancer death among men 40 to 79 years old, and prostate cancer is the second most common among men aged 80 and older. Among women, leukemia is the leading cause of cancer death before age 20, breast cancer ranks first at ages 20 to 59 years, and lung cancer ranks first at age 60 years and older.
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From 2001 to 2002, the number of recorded cancer deaths increased by 1,693 in men and by 1,810 in women (Table 8). The total number of deaths for the major cancers in men and women did not change substantially except for lung cancer (increased by 1,903) and colorectal cancer (decreased by 447) among women.
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| CANCER OCCURRENCE BY RACE AND ETHNICITY |
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Among other racial and ethnic groups, cancer incidence and death rates are lower for all cancer sites combined and for the four most common cancer sites than those for Whites and African Americans. However, incidence and death rates for cancers of the uterine cervix, stomach, and liver are generally higher in minority population than in Whites. Stomach and liver cancer incidence and death rates are more than twice as high in Asian/Pacific Islanders than in Whites, reflecting increased exposure to infectious agents such as H pylori and hepatitis C virus.15
Historical information to adjust for delays in reporting is not available for all racial and ethnic groups. From 1992 to 2001, incidence rates for all cancer sites combined, not adjusted for delayed reporting, decreased by 2.8% per year among American Indians/Alaskan Natives, by 1.2% per year in African Americans, by 0.7% among Asian/Pacific Islanders, by 0.6% among Hispanic-Latinos, and by 0.5% among Whites (data not shown). Similarly, the death rate from all cancers combined decreased from 1992 through 2001 by 1.6% per year in Asian/Pacific Islanders, by 1.4% among African Americans, by 0.9% among Whites, and by 0.5% among Hispanic-Latinos. The death rate from all cancers combined stabilized during this time period among American Indians/Alaskan Natives.3
Lifetime Probability of Developing Cancer
The lifetime probability of developing cancer is higher for men (46%) than for women (38%) (Table 10). However, because of the relatively early age of onset of breast cancer, women have a slightly higher probability of developing cancer before the age of 60. It is noteworthy that these estimates are based on the average experience of the general population and may overestimate or underestimate individual risk because of differences in exposure and/or genetic susceptibility.
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Cancer Survival by Race
African American men and women have poorer probability of survival once a cancer diagnosis is made. As shown in Figure 7, African Americans are less likely than Whites to be diagnosed with cancer at a localized stage, when the disease may be more easily and successfully treated, and are more likely to be diagnosed with cancer at a regional or distant stage of disease. Five-year relative survival is lower in African Americans than in Whites at each stage of diagnosis for nearly every cancer site (Figure 8). These disparities may result from inequalities in access to and receipt of quality health care and/or from differences in comorbidities. The extent to which these factors, individually or collectively, contribute to the overall differential survival is unclear.16 However, recent findings suggest that when African Americans receive similar cancer treatment and medical care as Whites they tend to have similar disease outcomes.17
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There have been notable improvements over time in the relative 5-year survival rates for the common cancer sites and all cancers combined (Table 11).3 This is true for both Whites and African Americans. Cancer sites for which survival has not improved substantially over the past 25 years include uterine corpus, uterine cervix, larynx, liver, lung, pancreas, stomach, and esophagus.
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Relative survival rate cannot be calculated for other racial and ethnic groups because accurate life expectancies are not available. However, based on cause-specific survival rates of cancer patients diagnosed from 1992 to 2000 in SEER areas of the United States, all minority populations except Asian/Pacific Islander women have an elevated probability of dying from all cancers combined within 5 years of diagnosis compared with non-Hispanic Whites after accounting for differences in age at diagnosis.18,19 For the four major cancer sites (prostate, female breast, lung and bronchus, and colon and rectum), minority populations are more likely to be diagnosed at distant stage compared with non-Hispanic Whites.19
| CANCER IN CHILDREN |
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| LIMITATIONS AND FUTURE CHALLENGES |
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Despite these limitations, the American Cancer Society estimates do provide evidence of current patterns of cancer incidence and mortality in the United States. Such estimates will assist in continuing efforts to reduce the public health burden of cancer.
| Footnotes |
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| REFERENCES |
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