Chemotherapy has been documented to be efficacious in prolonging survival for patients with various malignancies. One critical finding from numerous clinical trials and pooled analyses is that the efficacy of chemotherapy for breast cancer has been shown to decrease with age, from a 27% proportional reduction in 10-year mortality for women less than 50 years of age to 14% for women ages 50-59 years and 8% for women ages 60-69 years, and no benefit for women 70 years or older. These findings have remained constant even when the pooled results were examined with the addition of more patients from more recent trials in 1998, 2001, 2005 and 2008. These results are striking because there has been no decreasing efficacy of chemotherapy observed with advancing age for women with ovarian cancer, and for men and women with lung cancer and colon cancer. Numerous clinical trials have shown that chemotherapy is equally efficacious across different age groups of men and women with lung and colon cancer as well as women with ovarian cancer, including populations 70 years or older. Therefore, evidence-based clinical guidelines on chemotherapy from the National Institutes of Health (NIH) and other health authorities recommend chemotherapy for women with breast cancer less than 70 years old, whereas there are no age-restricted recommendations for patients with colon, ovarian and lung cancer. In other words, chemotherapy is strongly recommended for patients of all age groups with colon, ovarian and lung cancer. Randomized controlled clinical trials are considered to be the gold standard for determining the efficacy of a therapy. However, participants in clinical trials often do not represent a cross-section of patients in the community, and older patients were significantly under-represented in clinical trials. Population-based observational studies can therefore be useful adjuncts to randomized controlled trials in determining whether efficacy under controlled conditions in specialty centers translates into real-world effectiveness in the community and provide valuable insight into the benefit of a therapy in community practices that cannot be obtained from the clinical trials.Furthermore, in some circumstances where the randomized trials are not possible due to ethical or logistical issues, well-conducted observational studies can potentially serve to determine the comparative effectiveness of various drug therapies. Therefore, there is a critical need for information on whether the effectiveness of chemotherapy decreases with age for breast cancer only (as shown in clinical trials), or also decreases with age for lung, colorectal, and ovarian cancer and on whether chemotherapy is cost effective by different age groups and by tumor site.
The specific aims of this proposal are to: 1) determine whether the stage-specific efficacy of chemotherapy observed in controlled clinical trials is translated into real-world effectiveness in prolonging survival among community dwelling patients with breast, ovarian, lung and colorectal cancer at age 65 years or older;2) determine the association between the effectiveness of chemotherapy and advancing age (i.e., to determine whether chemotherapy is equally effective for all age groups of patients with these tumors);3) determine the comparative effectiveness of various chemotherapy agents or combination regimen-specific benefits in prolonging survival and their associations with age and tumor type;4) determine whether and to what extent patient and tumor characteristics as well as hospital and physician factors affect the relationship between the effectiveness of chemotherapy and age;and 5) to determine the cost- effectiveness of chemotherapy by age and tumor type. Our approach is to identify a large nationwide, population-based cohort of over 550,000 patients diagnosed with breast, ovarian, lung and colorectal cancer at age 65 years or older in 1991 through 2005 (with more cancer cases in 2006- 2007 from the new data linkage in early 2011) from the 17 Surveillance, Epidemiology, and End Results (SEER) registries, accounting for over 25% of the U.S. population. The large numbers of patients will enable us to examine the comparative effectiveness of chemotherapy in many subpopulations. This proposed study will examine the comparative- and cost-effectiveness of chemotherapy in association with advancing age across four major tumors in the real world community setting, which has never been tested before. The proposed innovative use of the nationwide and population-based Medicare claims data, which provide information on specific chemotherapy drug or regimens, will also allow for chemotherapy-specific effectiveness analysis.

Public Health Relevance

The main objectives of this project are to determine the comparative effectiveness and cost effectiveness of various chemotherapy regimens in prolonging survival among community dwelling patients with breast, ovarian, lung and colorectal cancer at age 65 or older;and to determine whether chemotherapy is equally effective for all age groups of patients with these tumors.

Agency
National Institute of Health (NIH)
Institute
Agency for Healthcare Research and Quality (AHRQ)
Type
Research Project (R01)
Project #
5R01HS018956-03
Application #
8611911
Study Section
Health Care Technology and Decision Science (HTDS)
Program Officer
Lawrence, William
Project Start
2012-04-01
Project End
2015-01-31
Budget Start
2014-02-01
Budget End
2015-01-31
Support Year
3
Fiscal Year
2014
Total Cost
Indirect Cost
Name
University of Texas Health Science Center Houston
Department
Public Health & Prev Medicine
Type
Schools of Public Health
DUNS #
800771594
City
Houston
State
TX
Country
United States
Zip Code
77225
Liu, Zheyu; Zhang, Kai; Du, Xianglin L (2016) Risks of developing breast and colorectal cancer in association with incomes and geographic locations in Texas: a retrospective cohort study. BMC Cancer 16:294
Du, Xianglin L; Zhang, Yefei; Hardy, Dale (2016) Associations between hematopoietic growth factors and risks of venous thromboembolism, stroke, ischemic heart disease and myelodysplastic syndrome: findings from a large population-based cohort of women with breast cancer. Cancer Causes Control 27:695-707
Du, Xianglin L; Zhang, Yefei; Hardy, Dale (2016) Temporal and Geographic Variations in the Receipt of Colony-Stimulating Factors and Erythropoiesis-Stimulating Agents in a Large Retrospective Cohort of Older Women With Breast Cancer From 2000 to 2009. Am J Ther 23:e411-21
Poonawalla, Insiya B; Piller, Linda B; Lairson, David R et al. (2016) Impact of Hematopoietic Growth Factors on Blood Transfusion Needs, Incidence of Neutropenia, and Overall Survival Among Elderly Advanced Ovarian Cancer Patients Treated With Chemotherapy. Int J Gynecol Cancer 26:95-103
Farias, Albert J; Du, Xianglin L (2016) Ethnic differences in initiation and timing of adjuvant endocrine therapy among older women with hormone receptor-positive breast cancer enrolled in Medicare Part D. Med Oncol 33:19
Kadakia, Aditi; Rajan, Suja S; Abughosh, Susan et al. (2015) CMF-regimen preferred as first-course chemotherapy for older and sicker women with breast cancer: Findings from a SEER-Medicare-based population study. Am J Clin Oncol 38:165-73
Huo, Jinhai; Du, Xianglin L; Lairson, David R et al. (2015) Utilization of surgery, chemotherapy, radiation therapy, and hospice at the end of life for patients diagnosed with metastatic melanoma. Am J Clin Oncol 38:235-41
Du, Xianglin L; Zhang, Yefei; Parikh, Rohan C et al. (2015) Comparative Effectiveness of Chemotherapy Regimens in Prolonging Survival for Two Large Population-Based Cohorts of Elderly Adults with Breast and Colon Cancer in 1992-2009. J Am Geriatr Soc 63:1570-82
Lairson, David R; Parikh, Rohan C; Cormier, Janice N et al. (2015) Cost-Effectiveness of Chemotherapy for Breast Cancer and Age Effect in Older Women. Value Health 18:1070-8
Du, Xianglin L; Parikh, Rohan C; Lairson, David R (2015) Racial and geographic disparities in the patterns of care and costs at the end of life for patients with lung cancer in 2007-2010 after the 2006 introduction of bevacizumab. Lung Cancer 90:442-50

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