Int J Cancer. 2020 Aug 20. doi: 10.1002/ijc.33261. Online ahead of print.
Analysis of routine population-based data has previously shown that patterns of surgical treatment for colorectal cancer can vary widely but there is limited evidence available to determine if such variation is also seen in the use of chemotherapy. This study quantified variation in adjuvant chemotherapy across both England using cancer registry data, and in more detail across the representative Yorkshire and Humber region. Individuals with stage II and III colorectal cancer who underwent major
resection from 2014-2015 were identified. Rates of chemotherapy were calculated from the Systemic Anti-Cancer Treatment database using multilevel logistic regression. Additionally, questionnaires addressing different clinical scenarios were sent to regional oncologists to investigate the treatment preferences of clinicians. The national adjusted chemotherapy treatment rate ranged from 2-46% (stage II cancers), 19%-81% (stage III cancers), 24%-75% (patients aged <70 years) and 5%-46% (patients aged ≥70 years). Regionally, the rates of treatment and the proportions of treated patients receiving combination chemotherapy varied by stage (stage II 4-26% and 0-55%, stage III 48-71% and 40-84%); and by age (<70 years 35-68% and 49-91%, ≥70 years 15-39% and 6-75%). Questionnaire responses showed significant variations in opinions for high-risk stage II patients both with deficient and proficient mismatch repair tumours and stage IIIB patients aged ≥70. Following a review of the evidence, open discussion in our region has enabled a consensus agreement on an algorithm for colorectal cancer that is intended to reduce variation in practice. This article is protected by copyright. All rights reserved.