Older adults with cancer have increasing needs in physical, cognitive, and emotional domains, and they can experience decline in all domains with the diagnosis and treatment of cancer. Social support plays a key role in supporting these patients, mitigating negative effects of diagnosis and treatment of cancer, and improving cancer outcomes. We review the importance of social support in older adults with cancer, describe the different components of social support and how they are measured, discuss current interventions that are available to improve social support in older adults, and describe burdens on caregivers. We also highlight Dr. Arti Hurria's contributions to recognizing the integral role of social support to caring for older adults with cancer.

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12064 Background: We previously showed that estimated glomerular filtration rate (eGFR) based on serum creatinine (Scr)(eGFRcr) using the 2009 CKD-EPI equation performed better than Cockroft-Gault equation (CG) in solid tumor patients in Brazil (Onco-GFR Study). In that study, eGFR based on Scr and cystatin C (Scys)(eGFRcr-cys) using the 2012 CKD-EPI was the most accurate equation and suitable for use as a confirmatory test. The CKD-EPI 2009 eGFRcr and 2012 eGFRcr-cys equations include a term for race (Black vs. non-Black). The 2021 CKD-EPI eGFRcr and eGFRcr-cys equations do not include race and are now recommended in the US, but have not been assessed in a multi-racial population or in cancer patients. The aim of this study is to evaluate the performance of the 2021 CKD-EPI equations in the Onco-GFR Study. Methods: Measured GFR (mGFR) was determined using the plasma clearance of 51Cr-EDTA. Scr and Scys assays were traceable to international standards. Results: A group of 1,200 patients recruited between April 2015 and September 2017 were included for analysis. Patients were 58.8±13.2 years, 50.8% male. Race distribution was Black participants 12.8% and non-Black participants 81.2%. Mean (SD) mGFR was 78.5±21.7 ml/min/1.73 m2. For eGFRcr, the overestimation of mGFR was larger for the 2021 vs. 2009 equation -10.0 vs. 8.1 ml/min/1.73m2, resulting in lesser accuracy 1-P30 of 22.3 vs. 19.1, but still more accurate than CG equation (1-P30 of 24.9, P = 0.05). For eGFRcr-cys, the overestimation of mGFR was larger for the 2021 vs. 2012 equation (-4.1 vs. -2.0 ml/min/1.73m2). eGFRcr-cys using the 2021 equation was more accurate than eGFRcr using the 2021 equation and eGFRcys using the 2012 equation (1-P30 9.8 vs. 22.3 and 12.3, p-values < 0.001 and 0.01, respectively) (Table). Conclusions: 2021 CKD-EPI eGFRcr equation race performed better than CG. 2021 CKD-EPI eGFRcr-cys performed better than 2021 eGFRcr and 2012 eGFRcys equations. Removing race from eGFR equations represents an advance and should be incorporated in cancer care. [Table: see text]