Nearly 50% of patients had metastatic pancreatic cancer at initial diagnose. Therefore, priority may be given to quality of life, which required improvement of survival without simultaneously compromise of health-related quality of life (HRQOL) during treatment. Moreover, radiotherapy could be an option for amelioration of local symptoms in addition to potential abscopal effects, contributing to improvement of HRQOL. Hence, we sought to evaluate the HRQOL after SBRT and different chemotherapy regimens in the management of metastatic pancreatic cancer. Patients with biopsy-proven and radiographically metastatic pancreatic cancer were included and prospectively followed up from 2013 to 2017. Chemotherapy was delivered after SBRT with an interval of 3 weeks, which were required for 4 cycles. The regimens were gemcitabine plus nab-paclitaxel (GT group) or gemcitabine plus S-1 (GS group). The Chinese version of Brief Pain Inventory (BPI) and 5-level European quality of life 5-dimensions (EQ-5D-5L) were used in this study. Due to limited survival of patients with metastatic pancreatic cancer, questionnaires were completed before SBRT and right after the whole treatment. Patient-reported global changes and scores of questionnaires were assessed. To be simplified, all changes were stratified into “better”, “no change” and “worse” in the analysis. Data were analyzed with Spearman’s rank correlation, ordinal regression. Propensity score matched analysis was further performed to evaluate these two regimens. Seventy-five and eighty-nine patients received gemcitabine plus nab-paclitaxel and gemcitabine plus S-1, respectively. No differences of baseline characteristics were found between these two groups. No differences of BPI scores were found between pre- and post-treatment in each group, while only the post-treatment EQ-5D-5L score was higher than that at baseline in GS group (P<0.001). The response “better” of BPI was found in 15 and 38 patients in GT and GS group, respectively (P<0.001). On multinomial logistic regression, compared with GS group, the probability of GT group achieving “better” global change of BPI was 0.289 (P=0.015). The “better” change of EQ-5D-5L was found in 20 and 42 patients in GT and GS group, respectively (P<0.001). After multinomial analysis, compared with GS group, the probability of GT group gaining improvement of EQ-5D-5L was 0.334 (P=0.031). After propensity score matched analysis, more patients had improvement of BPI and EQ-5D-5L in GS group compared with GT group (n=24 vs. n=12, P=0.002; n=28 vs. n=16, P=0.002). No grade 3 or more radiation-induced toxicity occurred. More patients in GT group experienced grade 3 or more hematological and gastrointestinal toxicity than those in GS group (n=25 vs. n=16, P=0.024; n=17 vs. n=10, P=0.049). GS may achieve better HRQOL than GT. Therefore, GS may be an alternative of GT for metastatic pancreatic cancer, especially for Asians.
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