Arti Hurria1, Supriya Mohile2, Ajeet Gajra2, Heidi Klepin2, Hyman Muss2, Andrew Chapman2, Tao Feng2, David Smith2, Can-Lan Sun2, Nienke De Glas2, Harvey Jay Cohen2, Vani Katheria2, Caroline Doan2, Laura Zavala2, Abrahm Levi2, Chie Akiba2, William P Tew2. 1. Arti Hurria, Tao Feng, David Smith, Can-Lan Sun, Vani Katheria, Caroline Doan, Laura Zavala, Abrahm Levi, and Chie Akiba, City of Hope Comprehensive Cancer Center and Beckman Research Institute, Duarte, CA; Supriya Mohile, University of Rochester Medical Center, Rochester; Ajeet Gajra, Upstate Medical University and Syracuse VA Medical Center, Syracuse; William P. Tew, Memorial Sloan Kettering Cancer Center, New York, NY; Heidi Klepin, Wake Forest University School of Medicine, Winston Salem; Hyman Muss, University of North Carolina at Chapel Hill, Lineberger Comprehensive Cancer Center, Chapel Hill; Harvey Jay Cohen, Duke University, Durham, NC; Andrew Chapman, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, PA; and Nienke De Glas, Leiden University Medical Centre, Leiden, the Netherlands. ahurria@coh.org. 2. Arti Hurria, Tao Feng, David Smith, Can-Lan Sun, Vani Katheria, Caroline Doan, Laura Zavala, Abrahm Levi, and Chie Akiba, City of Hope Comprehensive Cancer Center and Beckman Research Institute, Duarte, CA; Supriya Mohile, University of Rochester Medical Center, Rochester; Ajeet Gajra, Upstate Medical University and Syracuse VA Medical Center, Syracuse; William P. Tew, Memorial Sloan Kettering Cancer Center, New York, NY; Heidi Klepin, Wake Forest University School of Medicine, Winston Salem; Hyman Muss, University of North Carolina at Chapel Hill, Lineberger Comprehensive Cancer Center, Chapel Hill; Harvey Jay Cohen, Duke University, Durham, NC; Andrew Chapman, Sidney Kimmel Cancer Center, Thomas Jefferson University, Philadelphia, PA; and Nienke De Glas, Leiden University Medical Centre, Leiden, the Netherlands.
Abstract
PURPOSE: Older adults are at increased risk for chemotherapy toxicity, and standard oncology assessment measures cannot identify those at risk. A predictive model for chemotherapy toxicity was developed (N = 500) that consisted of geriatric assessment questions and other clinical variables. This study aims to externally validate this model in an independent cohort (N = 250). PATIENTS AND METHODS: Patients age ≥ 65 years with a solid tumor, fluent in English, and who were scheduled to receive a new chemotherapy regimen were recruited from eight institutions. Risk of chemotherapy toxicity was calculated (low, medium, or high risk) on the basis of the prediction model before the start of chemotherapy. Chemotherapy-related toxicity was captured (grade 3 [hospitalization indicated], grade 4 [life threatening], and grade 5 [treatment-related death]). Validation of the prediction model was performed by calculating the area under the receiver-operating characteristic curve. RESULTS: The study sample (N = 250) had a mean age of 73 years (range, 65 to 94 [standard deviation, 5.8]). More than one half of patients (58%) experienced grade ≥ 3 toxicity. Risk of toxicity increased with increasing risk score (36.7% low, 62.4% medium, 70.2% high risk; P < .001). The area under the curve of the receiver-operating characteristic curve was 0.65 (95% CI, 0.58 to 0.71), which was not statistically different from the development cohort (0.72; 95% CI, 0.68 to 0.77; P = .09). There was no association between Karnofsky Performance Status and chemotherapy toxicity (P = .25). CONCLUSION: This study externally validated a chemotherapy toxicity predictive model for older adults with cancer. This predictive model should be considered when discussing the risks and benefits of chemotherapy with older adults.
PURPOSE: Older adults are at increased risk for chemotherapy toxicity, and standard oncology assessment measures cannot identify those at risk. A predictive model for chemotherapy toxicity was developed (N = 500) that consisted of geriatric assessment questions and other clinical variables. This study aims to externally validate this model in an independent cohort (N = 250). PATIENTS AND METHODS: Patients age ≥ 65 years with a solid tumor, fluent in English, and who were scheduled to receive a new chemotherapy regimen were recruited from eight institutions. Risk of chemotherapy toxicity was calculated (low, medium, or high risk) on the basis of the prediction model before the start of chemotherapy. Chemotherapy-related toxicity was captured (grade 3 [hospitalization indicated], grade 4 [life threatening], and grade 5 [treatment-related death]). Validation of the prediction model was performed by calculating the area under the receiver-operating characteristic curve. RESULTS: The study sample (N = 250) had a mean age of 73 years (range, 65 to 94 [standard deviation, 5.8]). More than one half of patients (58%) experienced grade ≥ 3 toxicity. Risk of toxicity increased with increasing risk score (36.7% low, 62.4% medium, 70.2% high risk; P < .001). The area under the curve of the receiver-operating characteristic curve was 0.65 (95% CI, 0.58 to 0.71), which was not statistically different from the development cohort (0.72; 95% CI, 0.68 to 0.77; P = .09). There was no association between Karnofsky Performance Status and chemotherapy toxicity (P = .25). CONCLUSION: This study externally validated a chemotherapy toxicity predictive model for older adults with cancer. This predictive model should be considered when discussing the risks and benefits of chemotherapy with older adults.
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