For the study, Dr. Yezefski and colleagues identified patients with metastatic colorectal cancer newly diagnosed in 2010 or later in the regional database linking western Washington Surveillance, Epidemiology and End Results (SEER) data to claims from two large commercial insurers, and in the BC Cancer Agency database. Analyses were based on data from 575 patients in western Washington and 1,622 similar patients in British Columbia. Median age was 60 years in the former group and 66 years in the latter.
The rate of receipt of first-line systemic therapy was higher among the western Washington group than among the British Columbia group (79% vs. 68%, P less than.01), possibly because they were younger, Dr. Yezefski speculated. The most common regimen given to the former was FOLFOX (oxaliplatin, 5-fluorouracil, and folinic acid) chemotherapy (39%), whereas the most common given to the latter was FOLFIRI (irinotecan, 5-fluorouracil, and folinic acid) chemotherapy with bevacizumab (Avastin) (32%).
The mean monthly per-patient cost of first-line systemic therapy was $12,345 in western Washington, roughly double the $6,195 in British Columbia (P less than .01). Mean lifetime monthly systemic therapy costs were also higher in the former region ($7,883 vs. $4,830, P less than .01). However, median overall survival between the two regions was essentially the same, both among patients who received systemic therapy (21.4 vs. 22.1 months) and among all patients (17.4 vs. 16.9 months). Dr. Yezefski disclosed that he had no relevant conflicts of interest.
The study received funding from the Fred Hutchinson Cancer Research Center and BC Cancer Agency.
SOURCE: Yezefski et al., abstract LBA3579, https://am.asco.org/abstracts.