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Chinese Journal of Colorectal Diseases(Electronic Edition) ›› 2018, Vol. 07 ›› Issue (06): 523-530. doi: 10.3877/cma.j.issn.2095-3224.2018.06.005

Special Issue:

• Original Article • Previous Articles     Next Articles

Role of SATB1 in neoadjuvant radiotherapy of rectal cancer

Wenjian Meng1, Ziqiang Wang1, Yongyang Yu1,(), Xiaofeng Sun1, Zongguang Zhou1   

  1. 1. Department of Gastrointestinal Surgery, West China Hospital, Sichuan University, Chengdu 610041, China
  • Received:2017-04-27 Online:2018-12-25 Published:2018-12-25
  • Contact: Yongyang Yu
  • About author:
    Corresponding author: Yu Yongyang, Email:

Abstract:

Objective

To investigate the role of special AT-rich sequence binding protein 1 (SATB1) in neoadjuvant radiotherapy of rectal cancer.

Methods

SATB1 expression was immunohistochemically determined in primary cancer, normal mucosa, biopsy and lymph node metastasis from 142 rectal cancer patients who underwent preoperative radiotherapy (RT), 68 with and 74 without RT before surgery. The expression of SATB1 in rectal cancer tissues (n=142) and normal mucosa tissues (n=107), preoperative biopsy cancer tissues (n=84), and metastatic lymph nodes (n=43) were detected by tissue microarray. To investigate the effect of SATB1 expression on the prognosis of patients with rectal cancer. The relationship between SATB1 expression and multiple radiotherapy-related factors was analyzed by bioinformatics methods.

Results

SATB1 increased from normal mucosa to primary cancer (χ2=5.396, P=0.032), whereas it decreased from primary cancer to lymph node metastasis (χ2=6.405, P=0.022) in non-RT patients. Strong SATB1 was independently related to worse overall survival (HR, 0.516; P=0.039; 95% CI: 0.274~0.969) and disease-free survival (HR, 0.558; P=0.025; 95% CI: 0.335~0.930) in RT but not non-RT patients. Radiation can decrease SATB1 expression of rectal cancer tissues. SATB1 was negatively related to ataxia-telangiectasia mutated (ATM) and pRb2/p130 (χ2=5.427, P=0.032 and χ2=4.610, P=0.047), and positively to Ki-67 and TEM1 expression (χ2=4.339, P=0.037 and χ2=7.376, P=0.014) in patients underwent surgery after preoperative RT, which were verified in bioinformatics analysis.

Conclusions

Radiation can decrease SATB1 expression, and SATB1 may confer survival benefit for rectal cancer patients with preoperative RT by involving in radiation-responsive signaling pathways.

Key words: Rectal neoplasms, SATB1, Preoperative radiotherapy, Prognosis, Bioinformatics

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