Predictors of Early Relief After Cancer-Related Pain Procedures

Key Takeaways

• Among hospitalized patients with cancer-related pain undergoing a first inpatient interventional pain procedure, 25.5% were early overall responders within the 48-hour peri-procedural window.
• Higher baseline pain scores and lower baseline opioid doses were independently associated with early analgesic response.
• Responders had significantly better unadjusted survival, but responder status was not independently associated with 1-year mortality after adjustment.

Investigators examined early analgesic response after inpatient cancer-pain procedures in a single-center retrospective cohort of 349 hospitalized patients with cancer-related pain undergoing their first inpatient interventional pain procedure. They classified overall responders and non-responders using changes in daily mean numeric rating scale (NRS) pain scores and morphine equivalent daily dose (MEDD) across a 48-hour peri-procedural period. Multivariable logistic regression assessed independent predictors of response. For 1-year survival, investigators used Kaplan–Meier analysis, log-rank testing, and multivariable Cox proportional hazards regression.

Higher baseline NRS scores were associated with greater odds of early analgesic response after adjustment: odds ratio (OR), 2.13; 95% confidence interval (CI), 1.63–2.83. Higher baseline MEDD was associated with lower odds of response (OR, 0.95 per 10-mg increase), so lower opioid exposure tracked with a greater likelihood of early response.

Unadjusted Kaplan–Meier survival favored overall responders (log-rank P=0.037). After multivariable adjustment, responder status was not independently associated with 1-year mortality: the adjusted hazard ratio (HR) for non-responders versus overall responders was 1.26 (95% CI, 0.90–1.77).

Because the cohort was retrospective, the associations between baseline characteristics and early relief cannot establish that performing an intervention at a particular point in a patient’s course causes a better response. The unadjusted survival pattern did not remain independently significant after accounting for other factors.

Clinician Questions

Do early-response findings after inpatient cancer-pain procedures apply to outpatient or repeat procedures?

Applicability to outpatient or repeat procedures remains unknown because only first inpatient procedures were assessed; this does not establish that responses differ in those settings.

Does higher pain with lower opioid exposure establish the best time for an inpatient cancer-pain procedure?

The authors’ proposed therapeutic window is an interpretation of baseline associations, not a tested timing threshold. These retrospective data cannot establish that intervening earlier causes a better response.