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SnoN Overexpression is Predictive of Poor Survival in Patients with Esophageal Squamous Cell Carcinoma

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Annals of Surgical Oncology Aims and scope Submit manuscript

Abstract

Background

Earlier studies have identified the minimal overlapping region of amplification at 3q26 in esophageal squamous cell carcinoma (ESCC) by comparative genomic hybridization (CGH) analysis. These include PIK3CA which encodes the p110α catalytic subunit of phosphatidylinositol (PI) 3-kinase, a telomerase RNA component (TERC), a squamous cell carcinoma-related oncogene (SCCRO), ecotropic viral integration site-1 (EVI-1), and a Ski-related novel oncogene (SnoN). In the present study, we investigated the mRNA levels of four candidate genes (TERC, SCCRO, EVI-1, and SnoN) to determine whether genes other than PIK3CA are targets for amplification at 3q26 in ESCC. And also, we examined SnoN expression in ESCC samples.

Methods

Fifty-nine representative cases with ESCC were selected from our archives. We performed quantitative RT-PCR of four candidate genes (TERC, SCCRO, EVI-1, and SnoN) and immunohistochemistry for SnoN. Finally, we correlated these findings with the clinicopathological characteristics to determine their interrelationship.

Results

Among the four genes we tested, only SnoN mRNA was consistently overexpressed in primary ESCC, compared with those in corresponding nontumorous esophageal epithelia (P < 0.001). Immunoreactive SnoN was detectable in 31 of 59 (52.5%) esophageal squamous cell carcinoma specimens. The levels of SnoN expression were found to correlate with the depth of invasion and recurrence (P < 0.05). Furthermore, patients with positive staining for SnoN displayed more unfavorable outcomes than patients with negative staining (P < 0.05).

Conclusion

SnoN is likely to be the target of the amplification at 3q26 in ESCC and plays an important role in the development of ESCC, influencing disease-specific survival.

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Acknowledgements

We thank Takuji Kosuge for his expert technical assistance. We also thank Dr. T. Nishihira and Tohoku University for providing the TE-series cell lines.

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Authors and Affiliations

  1. Departments of Surgery for Organ Function and Biological Regulation, Nippon Medical School, 1-1-5 Sendagi, Bunkyo-ku, Tokyo, 113-8603, Japan

    Ichiro Akagi MD, Masao Miyashita MD, PhD, Hiroshi Makino MD, PhD, Tsutomu Nomura MD, PhD, Nobutoshi Hagiwara MD, PhD, Ken Takahashi MD, PhD, Kazumitsu Cho MD, PhD & Takashi Tajiri MD, PhD

  2. Molecular Anatomy and Medicine, Nippon Medical School, Tokyo, Japan

    Takuya Mishima MD, PhD & Toshihiro Takizawa MD, PhD

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  1. Ichiro Akagi MD
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  2. Masao Miyashita MD, PhD
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  3. Hiroshi Makino MD, PhD
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  4. Tsutomu Nomura MD, PhD
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Correspondence to Ichiro Akagi MD.

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Akagi, I., Miyashita, M., Makino, H. et al. SnoN Overexpression is Predictive of Poor Survival in Patients with Esophageal Squamous Cell Carcinoma. Ann Surg Oncol 15, 2965–2975 (2008). https://doi.org/10.1245/s10434-008-9986-y

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  • DOI: https://doi.org/10.1245/s10434-008-9986-y

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