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Critical analysis of mucin and signet ring cell as prognostic factors in an Asian population of 2,764 sporadic colorectal cancers

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International Journal of Colorectal Disease Aims and scope Submit manuscript

Abstract

Introduction

Conflicting data on the clinicopathological characteristics as well as prognosis and survival of signet ring cell (SRC) and mucinous adenocarcinomas (MA) of the colorectum persist.

Methods

Consecutive patients (2,764) with sporadic colorectal cancer from 1999 to 2005 were evaluated. The clinicopathological characteristics of these patients were reviewed. Univariate analysis was performed, and survival curves were constructed using the Kaplan–Meier method. Multivariate analysis assessed independent prognostic factors.

Results

The incidence of MA and SRC is 6% and 1.1%, respectively. MA and SRC tend to occur in patients aged ≤50 years (SRC 33%, MA 22%, ordinary adenocarcinomas (OA) 14%, p = 0.001) and are more commonly right-sided (MA 30%, SRC 27%, OA 19%, p = 0.001) than OA. SRC tend to be poorly differentiated (SRC 77%, MA 26%, OA 6%, p < 0.0001) and have a higher risk of recurrence (SRC 40%, MA 26%, OA 6%, p < 0.0001). SRC and MA are more likely to have locally advanced lesions (T3/T4; SRC 100%, MA 90%, OA 83%, p = 0.002) and lymph node metastases (SRC 89%, MA 61%, OA 52%, p < 0.0001) and present with an advanced stage at diagnosis (stage III/IV SRC 94%, MA 67%, OA 56%, p < 0.0001). SRC has poorer 5-year cancer-specific survival (CSS; 11.1%, 95% confidence interval (CI) 0–22.9%) compared with MA (46.8%, 95% CI 38.6–55.0%) and OA (58.7%, 95% CI 56.5–60.9%, p < 0.001). In a multivariate analysis, SRC is an independent poor prognostic factor (HR 1.9, 95% CI 1.1–3.0) but MA is not.

Conclusion

SRC and MA demonstrate clinicopathologic characteristics suggestive of a different biology compared with OA. In our dataset, SRC has a significantly poorer CSS whereas survival rates for MA are similar to OA. These characteristics are similar in both Asian and Western studies reported. Asian reports however suggest a lower incidence of MA.

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Acknowledgments

The authors would like to thank the following people in the preparation of the manuscript: (a) Singapore Polyposis Registry coordinator: Ms Loi TT, Carol, RN Msc (Healthcare); (b) Senior Biostatistician, Department of Clinical Research Singapore General Hospital: Ms Fook-Chong MC, Stephanie, BSc MSc(McGill) CStat; (c) Rest of the contributory authors to the manuscript: Dr Ming-Hian Kam, Dr Hak-Mien Quah, Dr Jit-Fong Lim, Dr Kok-Sun Ho, and A/Prof Choong-Leong Tang.

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Authors and Affiliations

  1. Department of Colorectal Surgery, Singapore General Hospital, Outram Road, Singapore, 169608, Singapore

    Min-Hoe Chew, Shen-Ann Eugene Yeo, Poh-Koon Koh, Kheng-Hong Ng & Kong-Weng Eu

  2. Yong Loo Lin School of Medicine, National University of Singapore, Singapore, Singapore

    Zhi-Peng Ng

  3. Department of Pathology, Singapore General Hospital, Singapore, Singapore

    Kiat-Hon Lim

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  1. Min-Hoe Chew
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  2. Shen-Ann Eugene Yeo
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Correspondence to Kong-Weng Eu.

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Chew, MH., Yeo, SA.E., Ng, ZP. et al. Critical analysis of mucin and signet ring cell as prognostic factors in an Asian population of 2,764 sporadic colorectal cancers. Int J Colorectal Dis 25, 1221–1229 (2010). https://doi.org/10.1007/s00384-010-1033-3

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  • DOI: https://doi.org/10.1007/s00384-010-1033-3

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