Abstract
Purpose
Colon cancer is predominantly a disease of older adults. Studies determining the influence of age on outcomes of colon cancer have conflicting results. We aim to determine the long-term outcomes and utilisation of adjuvant chemotherapy of older adults compared with younger adults who had had a resection of a primary colon cancer.
Methods
Consecutive patients who had resection of a primary colon cancer between January 1, 2000 and December 31, 2010 were identified from a prospective database and stratified into three age groups: ≤ 69 years, 70 to 79 years, and ≥ 80 years. Age-related differences in patients, cancer, and treatment characteristics were determined by chi-square tests. Five-year overall survival and cancer-specific survival were determined by Kaplan-Meier method and by multivariable Cox regression analysis to adjust for potential confounding factors.
Results
Of 1135 included patients, 469 (41%) patients were aged ≤ 69 years, 382 (34%) were 70–79 years, and 284 (25%) were ≥ 80 years. Increasing age group predicted more comorbidity (p < 0.001), cardiac comorbidity (p < 0.001), right-sided cancers (p < 0.001), and less adjuvant chemotherapy (stage III only; p < 0.001). Increasing age group was associated with worse overall survival by stage (p < 0.001) but not cancer-specific survival by stage (p = 0.83). Adjuvant chemotherapy in patients with stage III colon cancer independently predicted improved overall survival (p < 0.001) and cancer-specific survival (p = 0.01).
Conclusions
Compared with younger adults, older adults with colon cancer had worse survival outcomes and received less adjuvant chemotherapy.
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Acknowledgments
Authors would like to thank Professor Pierre Chapuis, Dr Owen Dent, and Gael Sinclair who assisted with the provision of the data from the Concord Repatriation General Hospital database on resected colorectal cancers.
Funding
MS received a Sydney Catalyst Postgraduate Research PhD Scholarship in 2018.
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Mohsen Shafiei contributed in data collection, statistical analysis, and writing of the manuscript. He is the corresponding author. Philip Beale and Prunella Blinman (lead author) contributed in study design, data validation, final writing, and editing of the manuscript.
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Shafiei, M., Beale, P. & Blinman, P. Utilisation of Adjuvant Chemotherapy and 5-Year Survival Analysis of Prospectively Recorded Cohort Data for Older Adults Versus Younger Adults with Resected Primary Colon Cancer. J Gastrointest Canc 51, 988–997 (2020). https://doi.org/10.1007/s12029-019-00343-5
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DOI: https://doi.org/10.1007/s12029-019-00343-5