4 Background: Lay health workers (LHWs) who are trained to proactively discuss goals of care and assess patient symptoms have improved value-based cancer care among Veterans and a Medicare Advantage population. Little data exists regarding the effect of integrating LHWs into community oncology care among commercially insured populations. In this study, we implemented an LHW intervention to assist with goals of care and symptom management in collaboration with a private community oncology practice among patients with advanced cancer. This randomized controlled trial evaluates the effect of the intervention on acute care use and secondarily on goals of care documentation and patient satisfaction. Methods: Newly diagnosed patients with advanced stages of solid and hematologic malignancies were randomized from 8/11/2016 through 6/5/2019 into the intervention and control groups. All patients were followed for 12 months or death, whichever was first. Patients reported satisfaction with care using the Consumer Assessment of Healthcare Providers and Systems survey at time of enrollment and 9 months follow-up. We compared risk of death using Cox Models and compared rates of acute care, palliative care and hospice use using generalized models adjusted for length of follow-up. Results: A total of 104 patients were randomized with 52 in the intervention and 52 in the control. In both groups, the mean age was 67 years; 70% were non-Hispanic white, 25% Asian Pacific Islander, 1% Native Hawaiian, 1% American Indian/Alaskan Native, 3% multiple races/ethnicities. There were no differences in cancer diagnoses or stages. There were no differences in rates of survival between the two groups. Intervention patients as compared to the control had lower mean emergency department visits (0.80 +/- 0.17 versus 1.9 +/- 0.46, p = 0.02) and hospitalizations (0.67 +/- 0.19 versus 1.49 +/- 0.37, p = 0.04), greater rates of goals of care documentation (92% versus 33% p = 0.002) and no differences in palliative care (88% versus 77% p = 0.16) or hospice use (27% versus 21% p = 0.45). At 9 months follow-up as compared to baseline, patients in the intervention experienced greater improvements in satisfaction with their care (difference-in-difference: 0.41, 95% CI 0.22-0.60, p < 0.001). Conclusions: An LHW intervention significantly reduced acute care use and improved patient experiences with cancer care as compared to a control group. This intervention may be a solution to improve care delivery and experiences for patients after a diagnosis of cancer in community oncology settings. Clinical trial information: NCT03154190 .