Abstract
Background
The self-expanding metallic stent (SEMS) provides effective decompression for patients with malignant large bowel obstruction (MLBO); however, mechanical damage to malignant cells from insertion may negatively affect prognosis, similar to surgical manipulation, and its oncological safety is unclear. We examined mechanical damage from SEMS placement using circulating cell-free DNA (cfDNA) and circulating tumor DNA (ctDNA).
Methods
Between 1 November 2014 and 30 June 2017, 35 MLBO patients were analyzed, comprising 25 SEMS patients and 10 transanal decompression tube (TDT) patients (control). Blood samples were collected before and after decompression on days 0, 1, 3, and 7. cfDNA, ctDNA, white blood cells, C-reactive protein, and lactate dehydrogenase were analyzed.
Results
The clinical success rates of SEMS and TDT were 88 and 90%, respectively (p = 1.0). The cfDNA concentration on day 7 was significantly higher in the SEMS group than in the TDT group (992 vs. 308 ng/mL; p = 0.005). A significant increase in ctDNA was observed in the SEMS group compared with the TDT group (83% vs. 22%; p = 0.002). The cfDNA concentration showed strong positive correlations with ctDNA and lactate dehydrogenase (R 2 = 0.838 and 0.593, respectively), and a weak positive correlation with C-reactive protein (R 2 = 0.263).
Conclusions
Despite equivalent clinical success rates, SEMS placement increased plasma levels of cfDNA and ctDNA by tumor manipulation, but TDT did not. Colonic stenting showed oncological risk in terms of molecular analysis.
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Acknowledgement
The authors thank Ms. Hazuki Kanno for technical support in the experiments, and Toshiaki Otsuka for statistical advice.
Funding
This research was supported by the Department of Gastrointestinal and Hepato-Biliary-Pancreatic Surgery, Nippon Medical School, Tokyo, Japan. The funding source played no role in this study.
Disclosures
Goro Takahashi, Takeshi Yamada, Takuma Iwai, Kohki Takeda, Michihiro Koizumi, Seiichi Shinji, Eiji Uchida have no conflicts of interest to declare.
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Takahashi, G., Yamada, T., Iwai, T. et al. Oncological Assessment of Stent Placement for Obstructive Colorectal Cancer from Circulating Cell-Free DNA and Circulating Tumor DNA Dynamics. Ann Surg Oncol 25, 737–744 (2018). https://doi.org/10.1245/s10434-017-6300-x
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DOI: https://doi.org/10.1245/s10434-017-6300-x