Efficacy of chemotherapy in elderly patients with unresectable pancreatic cancer: a multicenter review of 895 patients

Abstract

Background: The efficacy of chemotherapy for unresectable pancreatic cancer has improved. However, it is occasionally difficult to make treatment decisions for elderly patients. We reviewed the outcomes of elderly patients with unresectable pancreatic cancer by using a large cohort and evaluated whether they had received chemotherapy and the reason why.

Methods: Data for 895 pancreatic cancer patients who were treated using chemotherapy or best supportive care were analyzed considering demographics, clinical stage, treatment, and outcome. Data were analyzed using the chi-square test, Student t-test, or Mann-Whitney U-test, as appropriate. Outcomes were analyzed using the Kaplan-Meier method. Differences in survival were analyzed using the log-rank test.

Results: The median survival time was significantly shorter in elderly patients (≥65 years) than in younger patients (<65 years) (181 vs. 263 days, P = 0.0001). The median survival time of patients treated with chemotherapy was not significantly different between the elderly and the younger group (274 days vs. 333 days, P = 0.09), and nor was that of patients choosing best supportive care (84 days vs. 78 days, P = 0.83). These results held true even when the age cut-off between younger and elder patients was increased to 70, 75, and 80 years. Elderly patients treated with chemotherapy had a significantly longer median survival time than those choosing best supportive care (274 vs. 86 days, P < 0.0001); a significantly greater proportion of elderly patients chose best supportive care compared to younger patients (47.8 vs. 25.8%, P < 0.0001). The reason for choosing best supportive care was established in 261 elderly patients (82.9%); 133 (51.0%) met the eligibility criteria for chemotherapy, but of these, 78 (58.6%) were not informed about their disease. The treatment preferences of elderly patients were not always considered; they often received only best supportive care per family members preference (N = 65, 48.8%) or because the physician based their treatment decision only on the patient's age (N = 68, 51.1%).

Conclusions: Chemotherapy appears effective for elderly pancreatic cancer patients with unresectable disease, but treatment needs to be optimized to improve prognosis.

Keywords: Best supportive care; Chemotherapy; Elderly; Pancreatic cancer.

Fig. 1

Schematic flow chart of the study design. A total of 895 patients from amongst 1248 patients with unresectable PDAC (71.7%) were included. PC, pancreatic cancer; PDAC, pancreatic ductal adenocarcinoma

Fig. 2

Survival with respect to age and treatment. a Elderly group (PC patients aged ≥ 65 years) vs. younger group (PC patients aged <65 years) in all cohorts (N = 895). b Elderly PC patients who were treated with CT vs. BSC (N = 659). c Elderly vs. younger PC patients treated using chemotherapy (N = 519). MST, median survival time; CT, chemotherapy; BSC best supportive care; PC, pancreatic cancer