Stage-based variation in the impact of colon cancer surveillance.

Authors

null

Lucy Gately

Walter and Eliza Hall Institute, Melbourne, Australia

Lucy Gately , Christine Semira , Azim Jalali , Ian Faragher , Sumitra Ananda , Suzanne Kosmider , Kathryn M. Field , Sheau Wen Lok , Malcolm Steel , Margaret Lee , Rachel Wong , Hui-Li Wong , Peter Gibbs

Organizations

Walter and Eliza Hall Institute, Melbourne, Australia, Walter and Eliza Hall Institute of Medical Research, Melbourne, Australia, The Walter and Eliza Hall Institute of Medical Research, Melbourne, Australia, Department of Colorectal Surgery, Western Hospital, Melbourne, Australia, Western Health, Melbourne, Australia, Royal Melbourne Hospital, Melbourne, Australia, The Walter and Eliza Hall Institute of Medical Research, Parkville, Australia, Box Hill Hospital, Eastern Health, Box Hill, Australia, Department of Medical Oncology, Eastern Health, Walter and Eliza Institute of Medical Research, Melbourne, Australia, Eastern Health Monash University Oncology Unit, Box Hill, Australia

Research Funding

Other

Background: Multiple meta-analyses have demonstrated that routine surveillance following curative intent colorectal cancer surgery improves overall survival. This benefit is largely driven by early detection and curative intent resection of oligometastatic disease. Intuitively, any surveillance benefit should be proportional to recurrence risk, leading some to question the value of surveillance for stage I patients where recurrence rates are low. However, the survival benefit of surveillance has not previously been reported by stage. Methods: We explored data from a multi-site cohort of colorectal cancer patients (pts) diagnosed from 1 January 2001 to 31 December 2016. Pts were followed according to standard protocols with a standardized comprehensive outcome data captured prospectively. Pts with a rectal primary or metastatic disease at presentation were excluded from the analysis. We examined the correlation of stage at diagnosis with tumor recurrence and subsequent outcomes. Results: Of 3608 colon cancer pts, 690 (19%) had stage 1, 1580 (44%) had stage 2, and 1338 (37%) had stage 3 disease. Median follow-up was 7.8 years. Stage at diagnosis impacted recurrence rate (4% stage I vs 12% stage II vs 28% stage III, p < .0001) but not median time to recurrence. Recurrence patterns varied with stage (e.g. distant nodal disease 5% vs 7% vs 16%, p = .003; liver metastases 90% vs 53% vs 42%, p = 0.001). In pts with recurrence, resection of oligometastatic disease varied significantly by stage (58% vs 42% vs 30%, p < .0001) as did post-resection 5 year survival (91% vs 66% vs 43%, p < 0.001). In pts with recurrence treated with palliative intent, stage at diagnosis also impacted post-recurrence 5 year survival (11% vs 7% vs 5%, p < 0.03). Conclusions: Colon cancer stage at diagnosis substantially impacts the proportion of pts able to undergo curative intent surgery for surveillance detected recurrent disease, potentially driven by stage specific metastatic patterns. Stage at diagnosis also has a significant impact on post-resection survival outcomes potentially driven by stage specific biology. Our data indicate a far greater survival impact of surveillance for stage I colon cancer than would be anticipated based on recurrence rate alone.

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Abstract Details

Meeting

2019 ASCO Annual Meeting

Session Type

Poster Session

Session Title

Gastrointestinal (Colorectal) Cancer

Track

Gastrointestinal Cancer—Colorectal and Anal

Sub Track

Colorectal Cancer–Local-Regional Disease

Citation

J Clin Oncol 37, 2019 (suppl; abstr 3609)

DOI

10.1200/JCO.2019.37.15_suppl.3609

Abstract #

3609

Poster Bd #

101

Abstract Disclosures

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