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Clinical characteristics, risk factors and outcomes of asymptomatic rectal neuroendocrine tumors

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Abstract

Background

Rectal neuroendocrine tumors (NET) are often asymptomatic and frequently discovered during health examinations. However, data on the risk factors of asymptomatic rectal NETs are lacking. We investigated the risk factors, clinical characteristics and outcomes of asymptomatic rectal NETs discovered during health screening.

Materials and methods

Asymptomatic subjects who underwent colonoscopy during routine health screening at a tertiary hospital from March 2009 to July 2014 were reviewed. Subjects with histologically confirmed rectal NETs were compared with healthy controls from the same population. Risk factors for rectal NETs were analyzed by multivariable analysis. Clinical outcomes of the resected NETs were also analyzed.

Results

A total of 21,706 Subjects underwent screening colonoscopy during the study period. 3417 were excluded from the study, and 180 rectal NET subjects were compared with 18,109 controls. Multivariable analysis showed that a previous history of malignancy (OR 2.960, 95% CI 1.673–5.237, p < 0.001), hypertriglyceridemia (OR 1.482, 95% CI 1.046–2.100, p = 0.027), higher fasting plasma glucose levels (OR 1.008, 95% CI 1.003–1.014, p = 0.001) and higher carcinoembryonic antigen levels (OR 1.019, 95% CI 1.003–1.035, p = 0.021) were significant risk factors while older age (OR 0.964, 95% CI 0.951–0.977, p < 0.001) was a preventive factor. One hundred and sixty nine subjects had endoscopic resection, five were treated by local surgery and six by radical surgery. Complete resection was achieved in 152 subjects. There were three cases of positive lymph nodes and one metastasis. Histology revealed four lymphatic, five vascular and two cases of perineural invasion. One hundred and fifty seven subjects were followed up for at least 1 year (median 38.6 months, 12–84 months). There were no recurrences during the follow-up period.

Conclusions

Younger age, previous history of malignancy, higher fasting plasma glucose levels and hypertriglyceridemia are significantly associated with rectal NET risk.

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Acknowledgements

This work was supported through the research fund of Catholic Kwandong University, International St. Mary’s Hospital.

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Authors and Affiliations

  1. Department of Internal Medicine, Asan Medical Center, University of Ulsan College of Medicine, Seoul, South Korea

    Sun-Hye Ko

  2. Division of Gastroenterology, Department of Internal Medicine, International St. Mary’s Hospital, College of Medicine, Catholic Kwandong University, Simgokro 100gil 25, Seo-gu, Incheon, 22711, South Korea

    Myong Ki Baeg

  3. Department of Surgery, Incheon St. Mary’s Hospital, College of Medicine, Catholic University of Korea, Incheon, South Korea

    Seung Yeon Ko

  4. Department of Health Promotion, Seoul St. Mary’s Hospital, College of Medicine, The Catholic University of Korea, Seoul, South Korea

    Hee Sun Jung

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Correspondence to Myong Ki Baeg.

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Drs Sun-Hye Ko, Myong Ki Baeg, Seung Yeon Ko and Hee Sun Jung have no conflicts of interest or financial ties to disclose.

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Ko, SH., Baeg, M.K., Ko, S.Y. et al. Clinical characteristics, risk factors and outcomes of asymptomatic rectal neuroendocrine tumors. Surg Endosc 31, 3864–3871 (2017). https://doi.org/10.1007/s00464-016-5413-9

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