Validation of a Chemotherapy Toxicity Prediction Model in Older Adults With Cancer in Taiwan.

IntroductionThe Cancer and Aging Research Group (CARG) model predicts chemotherapy-related toxicities in older patients; however, its applicability has not been validated in Taiwanese patients. This study aims to validate the CARG model in older Taiwanese patients with solid tumors.MethodsPatients (N = 258) aged ≥65 years with solid tumors from a single medical center, slated for first-line chemotherapy, were recruited between 2018 and 2021, with follow-up until December 31, 2022. Patients were categorized into low- (N = 85), medium- (N = 117), and high- (N = 56) risk based on CARG. Validation of CARG involved receiver operating characteristic (ROC) curves. Individual CARG variables were analyzed using univariate analysis for their impact on toxicities and survival.ResultsToxicities of grades ≥3 were 38.8%, 44.4%, and 67.9% (P = .001) in the three ascending risk groups, and there were significant differences in both hematological (P = .002) and non-hematological (P < .001) toxicities. ROC was 0.631 (95% CI: 0.562-0.700), indicating satisfactory discrimination. One-year overall survival rates were 88.7%, 79.7%, and 63.8%, respectively, in ascending-risk groups, with high-risk groups showing decreased survival (P = .002). In the multivariate analysis, decreased hemoglobin, history of falls, and inability to walk one block remained significantly associated with toxicity. For overall survival, the inability to take medications was the only independent predictor.ConclusionThis prognostic study validated the CARG model in a heterogeneous solid tumor cohort in Taiwan. In addition to predicting both hematological and non-hematological toxicities, CARG could offer insights into patient survival among older individuals with cancer.