Advanced age in patients with colorectal cancer is a factor of poor prognosis, but little is known about geriatric factors associated with survival and chemotherapy prescription in frail elderly patients. Our research sought to investigate these factors in older patients with metastatic colorectal cancer (mCRC).

patients aged ≥75 years, who were treated for mCRC and have had a Comprehensive Geriatric Assessment (CGA) due to their frailty, were included in this multicenter practice study in the Loire Valley region (France). With initial patient care for mCRC as the starting point, demographic, oncological, geriatric and survival data were collected from the regional cancer database and the medical record of each patient. We analyzed overall survival and chemotherapy prescription, according to the geriatric factors of the CGA.

108 patients were enrolled (mean age 84.0 +/- 4.5 years; 57.4 % men), among whom 53 (49 %) received at least one line of chemotherapy. The median overall survival [95 %CI] was 8.05 [5.6–12.0] months. In univariate analysis, prescription of chemotherapy was associated with the number of severe co-morbidities, number of co-medications, G8 score, BMI, MMSE score, IADL and ADL scores, Lee index and Balducci criteria. Survival was significantly associated with chemotherapy, ADL and IADL scores, G8 score, repeated falls, number of severe co-morbidities, MMSE score, Lee index and Balducci criteria. In multivariate analysis, only the ADL score (HR [95 %CI]: 0.74 [0.55–0.99], p = 0.04), number of severe co-morbidities (HR [95 %CI]: 1.62 [1.06–2.47], p = 0.03) and repeated falls (HR [95 %CI]: 3.54 [1.70–7.39], p < 0.001) were significantly associated with survival.

in frail elderly patients with mCRC, dependency, co-morbidities and repeated falls are independent factors associated with survival. As such, there could be merit in taking these into consideration before the choice of oncological treatment is made.