Association of Patient Portal Messaging with Survival Among Radiation Oncology Patients.

Purpose: The shift to electronic health records has led to both patient portal messaging and large amounts of digital, real-world data for research. The objective of this study was to examine the association between portal messaging and survival among radiation oncology patients, using real-world data.

Methods And Materials: This retrospective cohort study included patients at least 21 years old and seen by radiation oncology providers between January 14, 2014, and April 23, 2023, at the University of California, San Francisco. We developed Cox proportional hazards models for the outcome of death and examined factors associated with portal messaging using logistic regression models.

Results: Among 25,367 patients, the median age was 64 (interquartile range [IR], 54-72), 13,175 (52%) were White, and 14,389 (57%) were male. Overall, as the first message in a thread, 8986 (35%) patients sent messages to radiation oncology providers, and 4218 (17%) patients were sent messages from radiation oncology providers. Patients with head and neck or genitourinary malignancies were more likely than those with other diagnoses to send portal messages to and be sent portal messages from radiation oncology providers. Both sending portal messages to radiation oncology providers (hazard ratio [HR], 0.90; 95% confidence interval [CI], 0.84-0.96; P = .001) and being sent messages from radiation oncology providers (HR, 0.77; CI, 0.70-0.84; P < .001) as the first message in a thread were associated with patient survival after adjusting for socioeconomic, disease, and treatment characteristics. There were disparities among patients sending portal messages to radiation oncology providers, including for Black versus White patients (odds ratio [OR], 0.60; CI, 0.51-0.69; P < .001) and for Medicaid versus Medicare patients (OR, 0.70; CI, 0.62-0.79; P < .001). There were also disparities among patients being sent portal messages by radiation oncology providers, including for Black versus White patients (OR, 0.77; CI, 0.64-0.91; P = .003), for Medicaid versus Medicare patients (OR, 0.76; CI, 0.65-0.89; P < .001), and for patients with female versus male providers (OR, 1.47; CI 1.34-1.62; P < .001).

Conclusions: Sending portal messages to and being sent portal messages from radiation oncology providers were associated with better survival. Future studies should elucidate how best to support patient and provider engagement.