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Slide 1 - BREAST CANCER IN IDAHO1997-2001
Slide 2 - 2 This PowerPoint presentation was created as a collaborative effort among the Cancer Data Registry of Idaho/ Idaho Hospital Association, Women’s Health Check, and the Idaho Breast and Cervical Cancer Alliance. It includes information on breast cancer: Incidence Screening Staging Treatment Survival Mortality Lifetime Risks
Slide 3 - 3 Age-adjustment: a technique which permits comparison of incidence or mortality rates after removing the effect of differing age distributions among the compared population groups. An age-adjusted rate is the hypothetical rate that would be observed in a population group if the age distribution of the group were the same as the age distribution of the standard population. Age-adjusted rates presented used the 2000 U.S. standard, and are not comparable to rates age-adjusted to the 1970 U.S. standard. AJCC: American Joint Commission on Cancer BRFSS: the Behavioral Risk Factor Surveillance System is an ongoing surveillance program developed by the Centers for Disease Control and Prevention. It is designed to estimate the prevalence of risk factors among adults aged 18 and older for the major causes of death and disability in Idaho. Cancer: a term that includes more than 100 different diseases, each characterized by the uncontrolled growth and spread of abnormal cells. Incidence Rate: the number of new cancer cases divided by the population at risk. DEFINITIONS
Slide 4 - 4 Mortality Rate: the number of cancer deaths divided by the population at risk. Person-years: a measure of the size of a population over time, used as the denominator in cancer incidence and mortality rates. Person-years are calculated as the product of the number of persons in the population at risk and the number of years over which cases/deaths are counted. SEER: part of the National Cancer Institute, the Surveillance, Epidemiology, and End Results (SEER) program consists of several population-based cancer registries throughout the U.S. SEER cancer statistics are designed to be representative of the U.S. Staging: the practice of dividing cancer cases into groups according to stage arose from the fact that survival rates were higher for cases in which the disease was localized than for those in which the disease has extended beyond the organ or site of origin. There are several staging nomenclatures, including AJCC, SEER, and extent-of-disease. AJCC Stage IIA: a tumor not more than 5 cm in greatest dimension, with lymph node involvement if not more than 2 cm, and no distant metastasis. This stage has a 5-year survival rate of almost 90%. SEER Summary Stage: in-situ (noninvasive), localized (within organ), regional (extension to adjacent organs/tissues, or regional lymph nodes), and distant (extension to other organs or distant lymph nodes). DEFINITIONS (CONTINUED)
Slide 5 - 5 BREAST CANCER INCIDENCE
Slide 6 - 6 BREAST CANCER INCIDENCE Breast cancer is the most common cancer among females. In Idaho, breast cancer accounted for 4,015 of 12,499 invasive cancer cases among females from 1997-2001. Age-adjusted incidence rates (2000 U.S. standard) differed by health district, ranging from 114.8 cases per 100,000 females in Health District 3 to 145.4 cases per 100,000 females in Health District 1. Geographical differences in breast cancer incidence rates are partially due to differences in breast cancer screening rates and individual risk factors, such as diet, obesity, sedentary life style, hormonal influences, use of alcohol and tobacco, and family history. Compared to SEER data, breast cancer incidence was significantly lower in Idaho from 1997-2001. The age-adjusted incidence of female breast cancer in Idaho was 4.8% lower than SEER data for all races, and 8.1% lower than SEER data for Whites.
Slide 7 - 7 BREAST CANCER INCIDENCE
Slide 8 - 8 BREAST CANCER INCIDENCE Breast cancer incidence rates increase steadily with age, which is the single most important risk factor for breast cancer. A 60 year old woman’s risk of developing breast cancer is about fifteen times higher than that of a 30 year old woman. Risk of developing invasive breast cancer by age: By age 25 - 1 in 17,334 By age 35 - 1 in 604 By age 45 - 1 in 112 By age 55 - 1 in 34 By age 65 - 1 in 17 All ages - Between 1 in 7 and 1 in 8 Among women aged 70-79, nearly 1 in 200 were diagnosed with breast cancer each year from 1997-2001. Age-specific breast cancer rates in Idaho, 1997-2001, were about the same or lower than SEER rates, 1996-2000, for most age groups.
Slide 9 - 9 BREAST CANCER INCIDENCE Trends in Breast Cancer Incidence, 1970-2001
Slide 10 - 10 BREAST CANCER INCIDENCE From 1970-2001, female breast cancer incidence increased over 47% in Idaho, about 1.3% per year. From 1973-2000, female breast cancer incidence increased 32.0% in SEER regions, about 1.4% per year. The incidence trend for Idaho closely matches the trend for SEER regions, although breast cancer incidence is about 10% lower for female Idahoans than White females in SEER regions. Breast cancer incidence trends for health districts generally match the shape of the Idaho and SEER trends, but have considerable variability from one year to the next due to the smaller number of cases diagnosed per year. The increase in breast cancer incidence over time is partially related to screening, as geographic areas with higher screening utilization have higher incidence rates, and the increase in new breast cancer cases has been limited generally to in-situ and localized cases. Incidence rates of regional and distant-staged cases have not changed appreciably over time.
Slide 11 - 11 BREAST CANCER SCREENING Mammogram During Past 2 Years, Women Aged 40 and Older Mammogram During Past 2 Years, 2002, Women Aged 40 and Older
Slide 12 - 12 BREAST CANCER SCREENING Statewide 2002 Approximately 14 percent of Idaho women aged 40 and older have never had a mammogram. Overall, timely mammography screening could prevent approximately 15%–30% of all deaths from breast cancer among women over the age of 40. In 2002, the proportion of Idaho women aged 50 and older who have had a mammogram AND clinical breast exam within the previous 2 years was 66.0%. In 2002, 67.0 percent of Idaho women aged 40 years and older had received a mammogram within the previous 2 years. The Health People 2010 Target is 70 percent.
Slide 13 - 13 BREAST CANCER SCREENING Among Public Health Districts Breast cancer screening rates vary among Idaho’s public health districts, ranging from a low of 59.7% in Health District Seven to 77.5% in the Central Health District. Healthy People 2010 Objective 3-13 Increase the proportion of women aged 40 years and older who have received a mammogram within the preceding 2 years. Target: 70 percent.
Slide 14 - 14 BREAST CANCER STAGING
Slide 15 - 15 Early detection through breast self-exams and mammography can help identify breast cancers at earlier stages and improve long-term prognosis and survival time. The above table shows the distribution of female breast cancer cases by SEER general summary stage. The height of the colored sections of the bars shows the percent distribution by stage for SEER Whites, 1996-2000, and Idaho and the public health districts, 1997-2001. The numbers in the bars are stage-specific age-adjusted breast cancer incidence rates. In both Idaho and SEER regions, approximately 70 percent of breast cancers are diagnosed at the “local” or “in situ” stage, before the cancer has spread to other tissues or organs of the body, and 30 percent are diagnosed at the “regional” or “distant” stage, after the cancer has already spread to surrounding tissues, and/or lymph nodes or has metastasized to other organs of the body. BREAST CANCER STAGING
Slide 16 - 16 The percentage of late staged cases has decreased over time since the 1970s, for all age groups and for both white non-Hispanic women and women of other race/ethnic groups. Hispanic women in Idaho are significantly more likely to be diagnosed with late stage breast cancers. In Idaho, 1997-2001, 47% of Hispanic women and 29% of non-Hispanic women were diagnosed with late stage breast cancers. In SEER regions, 1996-2000, 34% of Hispanic women and 28% of non-Hispanic women were diagnosed with late stage breast cancers. BREAST CANCER STAGING
Slide 17 - 17 BREAST CANCER STAGING Among Idaho female breast cancer cases aged under 65 years, stage at diagnosis was statistically significantly related to insurance status (p<.001). Uninsured women and women with Medicaid were significantly more likely to have late stage diagnoses compared with women with private insurance or Medicare. This same pattern holds for age groups under 50 and 50-64. For women aged 65 and older, over 90% have Medicare or private insurance, and about 25% of these cases have late stage diagnoses.
Slide 18 - 18 BREAST CANCER TREATMENT Use of Chemotherapy and Radiation Therapy by Type of Breast Cancer Surgery, 1997-2001
Slide 19 - 19 Treatment for breast cancer may include a combination of surgery, radiation, and chemotherapy. Surgeries for breast cancer include: partial mastectomy, with (37.3% of total cases) and without lymph node removal (8.5%) simple mastectomy, with (4.5%) and without lymph node removal (2.4%), and radical or modified radical mastectomy (42.7%). The most common treatment for Idaho resident cases diagnosed from 1997-2001 was partial mastectomy with lymph node removal in combination with radiation or radiation and chemotherapy (31.1% of total cases). The next most common treatment combination was radical/modified radical mastectomy with neither radiation nor chemotherapy (25.0% of total cases). Note: CDRI chemotherapy statistics are likely under-estimates due to reporting limitations. BREAST CANCER TREATMENT
Slide 20 - 20 BREAST CANCER TREATMENT Breast Cancer Treatment by Stage at Diagnosis, 1997-2001
Slide 21 - 21 Type of surgery differed depending on stage of cancer at time of diagnosis. Radical/modified radical mastectomy was performed for about 39% of AJCC pathologic stage 1 cases, and about 77% of stage IIIA cases. The use of radical/modified radical mastectomy generally increased with increasing stage. For stage IV cases, other surgeries were often performed with a focus on palliative outcomes. Type of surgery can also be divided into breast-conserving surgery and mastectomy. Breast-conserving surgery is partial mastectomy, and includes lumpectomy or excisional biopsy, wedge resection, and quadrantectomy. Mastectomy refers to total (simple) mastectomy, modified radical mastectomy, radical mastectomy, and extended radical mastectomy. BREAST CANCER TREATMENT
Slide 22 - 22 The use of breast-conserving surgery was highest for AJCC stage I cases (57.2%). Data from the National Cancer Data Base, a program of the American College of Surgeons, showed that 58.0% of AJCC stage 0 and I patients, and 36.2% of AJCC stage II (A and B) patients were treated with partial mastectomy (with or without axillary node dissection) during 1995. BREAST CANCER TREATMENT
Slide 23 - 23 BREAST CANCER TREATMENT Type of Treatment for AJCC Path. Stage IIA Breast Cancer by Health District, 1997-2001
Slide 24 - 24 Type of surgery differed by health district in Idaho. For AJCC pathologic stage IIA cases, breast-conserving surgery was most likely to be performed in Health District 4 (53.3% of cases), and least likely to be performed in Health Districts 1 (33.1% of cases) and 5 (31.7% of cases). From 1995-1999, approximately 83% of stage IIA cases in SEER regions were treated with breast-conserving surgery. SEER data show similar stage-specific treatment patterns between Blacks and Whites. For stage IIA cases, 82.1% of Whites and 87.0% of Blacks were treated with breast-conserving surgery. BREAST CANCER TREATMENT
Slide 25 - 25 Treatment lag time was defined as the number of days between the date of diagnosis and any type of treatment. For 1997-2001 Idaho female invasive breast cancer cases, lag times were as follows: 44.8% were 7 days or less. 63.8% were 2 weeks or less. 78.4% were 3 weeks or less. 89.5% were 1 month or less. 98.5% were 2 months or less BREAST CANCER TREATMENT
Slide 26 - 26 BREAST CANCER SURVIVAL Breast Cancer Survival, 1987-2001
Slide 27 - 27 Survival rates from all causes of death were estimated using the life table method. For survival analyses, death certificate only cases, autopsy only cases, and persons with other primary cancers were excluded. Relative survival statistics show the probability of surviving, compared with a general group of females from the U.S. with the same ages as the cases at time of diagnosis. Survival rates differed significantly by stage of diagnosis, showing the importance of early detection in improving the chances of survival. Five-year relative survival rates for Idaho resident females diagnosed with breast cancer were 100% for in situ cases, 96% for localized cases, 78% for regional cases, and 15% for distant cases. Stage-specific survival rates were quite similar between Idaho resident females and females residing in SEER regions. BREAST CANCER SURVIVAL
Slide 28 - 28 BREAST CANCER MORTALITY Breast Cancer Mortality in Idaho, 1991-2001
Slide 29 - 29 From 1997-2001, there were 805 breast cancer deaths among female Idahoans. Among the leading cancer deaths, breast cancer is second only to lung cancer, accounting for 17% of all female cancer deaths in Idaho, 1997-2001. The majority of female breast cancer deaths (87%) occurred in women over the age of 50. In Idaho, breast cancer is the second leading cause of death among women aged 35-54 (diseases of the heart is the leading cause). In this age group, 1997-2001, breast cancer accounted for 181 (30%) of 596 total cancer deaths, more than twice as many as any other type of cancer. Healthy People 2010 Objective 3-3 Reduce the breast cancer death rate. Target: 22.3 deaths per 100,000 females. U.S. Baseline: 27.0 breast cancer deaths per 100,000 females occurred in 1998 (AAR 2000 standard]. BREAST CANCER MORTALITY
Slide 30 - 30 BREAST CANCER LIFETIME RISKS Risks of Developing and Dying from Breast Cancer Note: *Risks for ages 75 and over are not precise - best estimates are shown.
Slide 31 - 31 Lifetime risks of developing and dying from breast cancer were estimated with DEVCAN software using Idaho data. Risks of developing and dying from breast cancer increase with age. A 40 year old woman has a greater than 1 in 8 risk of ever developing breast cancer, higher than for any other cancer. A 40 year old woman has a 1 in 33 risk of dying from breast cancer, second only to the risk of dying from lung cancer. BREAST CANCER LIFETIME RISKS
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