The Age-Adjusted Charlson Comorbidity Index Predicts Prognosis in Elderly Cancer Patients

Purpose: The age-adjusted Charlson comorbidity index (ACCI) is a useful measure of comorbidity to standardize the evaluation of elderly patients and has been reported to predict mortality in various cancers. To our best knowledge, no studies have examined the relationship between the ACCI and survival of elderly patients with cancer. Therefore, the primary objective of this study was to investigate the relationship between the ACCI and survival of elderly patients with cancer. Patients and Methods: A total of 64 elderly patients (>80 years) with cancer between 2011 and 2021 were enrolled in this study. According to the ACCI, the age-adjusted comorbidity index was calculated by weighting individual comorbidities; patients with ACCI<11 were considered the low-ACCI group, whereas those with ACCI >= 11 were considered the high-ACCI group. The correlations between the ACCI score and survival outcomes were statistically analyzed. Results: There was a significant difference in overall survival (OS) and progression-free survival (PFS) between the highACCI group and the low-ACCI group (P<0.001). The median OS time of the high-ACCI group and the low-ACCI group were 13.9 (10.5-22.0) months and 51.9 (34.1-84.0) months, respectively. The 2-, 3-, and 5-year survival rates of the high-ACCI group were 28.1%, 18.8%, and 4.2%, respectively, whereas the 2-, 3-, and 5-year survival rates of the low-ACCI group were 77.3%, 66.4%, and 39.1%, respectively. Multivariate analysis showed that ACCI was independently associated with OS (HR=1.402, 95% CI: 1.226-1.604, P < 0.05) and PFS (HR=1.353, 95% CI: 1.085-1.688, P = 0.0073). Conclusion: The ACCI score is a significant independent predictor of prognosis in elderly patients with cancer.