The performance of three oncogeriatric screening tools - G8, optimised G8 and CARG - in predicting chemotherapy-related toxicity in older patients with cancer. A prospective clinical study.

Background: Older patients are vulnerable to chemotherapy-related toxicity (CRT). Therefore we evaluated screening tools in their power to predict CRT.

Methods: Patients with cancer aged ≥65 years completed three screening questionnaires (G8, optimised G8 and Cancer and Ageing Research Group (CARG). Additionally, Comprehensive geriatric assessment (CGA) for verification of supportive care needs was undertaken on patients with impaired G8 scores. During chemotherapy treatment patients were assessed, capturing grade 0-5 CRT as defined by NCI CTCAE 4.

Results: 104 patients with non-haematological cancers were included at three study sites. Median age was 73 years (range 65-85). Onco-geriatric screening detected 74% as impaired using G8 and optimised G8 questionnaires and 86% using CARG screening. Grade 3-5 toxicity affected 64.4% of all patients. G8 (OR 0.3 95% CI [0.1;1.0]) and optimised G8 (OR 0.4 95% CI [0.1; 1.5]) did not reliably predict CRT, whereas screening with CARG demonstrated a strong prediction of severe CRT: OR 4.2, 95% CI [1.1, 15.9]. CGA was undertaken on 66 patients, revealing deficiencies in nutritional (83%) and functional-status (54%) and occurrence of relevant comorbidity (53%).

Conclusion: The CARG tool could be useful for predicting CRT. CGA showed clinically relevant supportive care needs in patients with a positive G8 screening.