Testing Symptom Severity Thresholds and Potential Alerts for Clinical Intervention in Patients With Cancer Undergoing Chemotherapy.

Purpose: Symptom monitoring is attracting attention as a way to improve adherence to cancer therapy, reduce treatment-related toxicities, and possibly improve overall survival. How reporting thresholds affect symptom alert generation and clinical outcomes is poorly understood.

Patients And Methods: We analyzed data from 38 US health care institutions collected for the prospective Eastern Cooperative Oncology Group-American College of Radiology Imaging Network E2Z02 Symptom Outcomes and Practice Patterns study. Participants were outpatients receiving chemotherapy for breast (n = 642), colorectal (n = 486), or lung cancer (n = 340) who rated symptom severity using the MD Anderson Symptom Inventory at 2 assessment points 1 month apart. Percentages of patients with pain, dyspnea, fatigue, or distress at different thresholds (score of 4-7 on a 0-10 scale) were compared. The percentage of patients whose performance status had worsened at follow-up was used to estimate risk for missing clinically important symptom data by using higher severity thresholds.

Results: At the guideline-recommended threshold of ≥ 4, suprathreshold rates were 60% for any of the 4 symptoms at the initial survey; performance status worsened at follow-up for 27% of all patients with any symptom rated ≥ 4 at the initiate survey. When the threshold was increased to ≥ 7, approximately half of patients (51%) with worsened performance status were not identified.

Conclusion: The burden to clinicians from an alert threshold of ≥ 4 (per many current guidelines) would be substantial. However, setting higher alert thresholds may miss a large percentage of patients who need clinical intervention. These results may inform resource planning when implementing electronic symptom screening at an institutional or practice level.