Frequency and distribution of gastrointestinal oncology patient-reported symptomatic adverse events (SAEs) at a comprehensive cancer center

463 Background: In clinical trials, the systematic collection of patient (pt) reported outcomes has been shown to improve quality of life & overall survival. To develop predictive care models for symptom management, we explored the frequency & distribution of SAEs reported by pts who reported electronic patient reported outcomes (ePRO) prior to outpatient visits to the Gastrointestinal Cancer Center (GCC) at Dana Farber Cancer Institute (DFCI). Methods: ePRO is a modified NCI Patient Reported Outcomes – Common Terminology Criteria for Adverse Events instrument distributed weekly to GCC pts with a medical/surgical/radiation oncology encounter. Responses are available to the care team in the electronic health record. ePRO consists of presence/frequency/severity/interference of 15 core SAEs (fatigue, insomnia, general pain, decreased appetite, nausea, vomiting, constipation, diarrhea, shortness of breath, numbness and tingling, rash, concentration, fever, anxiety, sadness). Responses are scored 0 to 3 (with 2 and 3 indicating moderate and severe SAEs, respectively). We examined the frequency & distribution of grade 2 and 3 SAEs in ePRO responders by age, gender, race/ethnicity. All pts had gastrointestinal cancer and an outpatient visit for treatment, symptom management, follow-up care. Results: From 9/1/2018 to 8/31/2020, 1912 unique pts responded (response rate 23%). Most respondents were age 50-69 years (58% compared to 15% age