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Specialist Palliative Care Linked to One-Third Fewer ED Visits and Hospitalizations in Stage IV Cancer
Among patients with stage IV cancer, receipt of specialist palliative care was associated with approximately 36% fewer emergency department visits and about 37% fewer inpatient hospitalizations compared with those who received no such care, based on a bias-corrected observational analysis (PERR HR 0.644, 95% CI 0.524–0.792 for ED visits; PERR HR 0.633, 95% CI 0.539–0.743 for hospitalizations). These effect sizes were statistically robust and persisted even when palliative care was initiated as late as approximately one year after a stage IV cancer diagnosis.
What Was Studied
This study investigated whether referral to specialist palliative care (SPC) reduces acute healthcare utilization — specifically emergency department visits and inpatient hospitalizations — among patients with stage IV cancer in a real-world clinical setting. Prior evidence from randomized controlled trials on this question has been described as limited and inconclusive, motivating a rigorous observational approach using a novel statistical method designed to reduce confounding.
How It Was Studied
This was a retrospective observational cohort study conducted at the National Cancer Centre Singapore, enrolling patients diagnosed with stage IV cancer between January 2019 and December 2022, with follow-up extending to July 2023. The full cohort comprised 7,144 patients, of whom 1,499 (21.0%) received specialist palliative care during the observation period. To improve comparability between groups, each SPC recipient was matched with replacement to up to three patients who did not receive SPC, yielding a matched analytic cohort of 5,948 individuals. The primary analytical tool was the prior event rate ratio (PERR) method, a bias-correction technique that uses each patient’s pre-exposure event rate to adjust for unmeasured confounding — a key methodological feature intended to address the limitations inherent in observational cancer care data.
What Was Observed
- Emergency department utilization was substantially lower in SPC recipients. Patients who received specialist palliative care had roughly 36% fewer ED visits compared with matched controls who did not receive SPC, a difference that was statistically highly significant (PERR HR 0.644, 95% CI 0.524–0.792, P<0.001).
- Inpatient hospitalization rates were similarly reduced. The rate of inpatient hospitalizations among SPC recipients was approximately 37% lower than among non-recipients, again with a narrow and statistically significant confidence interval (PERR HR 0.633, 95% CI 0.539–0.743, P<0.001).
- Earlier SPC initiation was associated with greater reductions, though late initiation still conferred benefit. A statistically significant interaction test (P<0.001) confirmed that earlier referral to palliative care produced larger reductions in acute utilization. Importantly, however, even patients who began SPC roughly one year after their stage IV diagnosis still experienced a significant reduction in both outcomes, suggesting a meaningful benefit window beyond early-stage referral.
Why This Matters
The evidence base for specialist palliative care’s effect on acute healthcare utilization has previously been characterized as limited and inconclusive, with randomized trial data not always reflecting real-world clinical practice. This study addresses that gap directly by applying a novel bias-corrected analytic method to a sizable real-world cohort, producing effect estimates with relatively narrow confidence intervals. The finding that late initiation of SPC still produces meaningful reductions in emergency and hospital use has direct relevance for how and when palliative care referrals are timed in oncology practice.
How to Read This Result
While the effect sizes are consistent and statistically robust across both outcomes, this remains an observational study of medium methodological strength, and residual confounding cannot be excluded — patients selected for specialist palliative care may differ from non-recipients in unmeasured prognostic or preference-related ways that the PERR correction does not fully eliminate.
Limitations
The retrospective design precludes causal inference, and selection into palliative care is likely influenced by clinical and patient factors not captured in the data. Real-world administrative and clinical records introduce the possibility of systematic selection bias. Although the PERR method represents a methodological advance for observational studies, its underlying assumptions — including that pre-exposure event rates adequately proxy for confounding — may not hold uniformly across all patient subgroups, introducing uncertainty into the magnitude of the estimated effects.