Association Between Oncology Clinical Pathway Utilization and Toxicity and Cost Outcomes in Patients With Metastatic Solid Tumors

PURPOSE This retrospective observational study compared cancer care toxicity and cost outcomes for patients with metastatic cancer with nine different cancer types prescribed on- versus off-pathway regimens.METHODS This study used claims and authorization data from a national insurer between January 1, 2018, and October 31, 2021. Participants included adults with metastatic breast, lung, colorectal, pancreatic, melanoma, kidney, bladder, gastric, or uterine cancer, who were prescribed first-line anticancer regimens. Multivariable regressions were used to assess outcomes including counts of emergency room visits or hospitalizations, use of supportive care medications, immune-related adverse events (IRAEs), and health care costs.RESULTS Of the 8,357 patients in the study, 5,453 (65.3%) were prescribed on-pathway regimens. The on-pathway proportion trended downward, from 74.3% in 2018 to 59.8% in 2021. The on- and off-pathway groups had a similar proportion of patients with treatment-related hospitalization (adjusted odds ratio [aOR], 1.080; P = .201) and IRAEs (aOR, 0.961; P = .497). More all-cause hospitalizations (aOR, 1.679; P = .013) were observed among patients with melanoma treated on-pathway. The on-pathway group had higher use of supportive care drugs in bladder cancer (aOR, 4.602; P < .001) and colorectal cancer (aOR, 4.465; P < .001), and lower use in breast (aOR, 0.668; P = .001) and lung cancer (aOR, 0.550; P < .001). On average, on-pathway patients incurred $17,589 less total health care cost (P < .001), and $22,543 lower chemotherapy cost (P < .001) than those from the off-pathway group.CONCLUSION Our findings suggest that use of on-pathway regimens was associated with significant cost savings. Toxicity outcomes were variable by disease, but overall, there were similar numbers of treatment-related hospitalizations and IRAEs compared to off-pathway regimens. This cross-institutional study provides evidence to support the use of clinical pathway regimens for patients with metastatic cancer.