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Clinical Article
Study on the correlation between MRI features and KRAS status of rectal cancers before operation
JIANG Xueqin  YAN Chenchen  ZHOU Zhengyang 

Cite this article as: Jiang XQ, Yan CC, Zhou ZY. Study on the correlation between MRI features and KRAS status of rectal cancers before operation. Chin J Magn Reson Imaging, 2020, 11(11): 1004-1009. DOI:10.12015/issn.1674-8034.2020.11.010.


[Abstract] Objective: To analyze whether the MRI features of rectal cancers can predict Kirsten Rat Sarcoma Viral Oncogene Homolog (KRAS) mutation status.Materials and Methods: Eighty-two patients who were confirmed to have rectal cancers by surgery and pathology and had undergone KRAS gene examination were collected retrospectively. The patients were divided into a mutant group and a wild-type group according to the mutation status of KRAS gene. Two doctors analyzed their MRI characteristics, including tumor location, gross morphology, periintestinal involvement, circumferential margin (CRM), tumor maximum longitudinal length (LTL), tumor maximum axial length (ATL), maximum axial length/maximum longitudinal length (ATL/LTL), ADC value, etc., and then analyze whether there are differences between the two groups.Results: The KRAS mutant group and the wild-type group had significant differences in tumor morphology, ATL and ATL/LTL (χ2=11.815, P=0.001; Z=-2.268, P=0.023; Z=-2.422, P=0.015). Larger ATL/LTL were more prone to KRAS gene mutation. ROC analysis between the two groups showed that the area under the curve (AUC) of ATL and ATL/LTL were 0.645 and 0.655, respectively.Conclusions: There were significant differences in ATL and ATL/LTL between KRAS mutant group and wild type group.
[Keywords] magnetic resonance imaging;rectal cancer;KRAS mutation;case-control studies

JIANG Xueqin Nanjing Drum Tower Hospital Clinical College of Nanjing Medical University, Nanjing 210008, China

YAN Chenchen Nanjing Drum Tower Hospital Clinical College of Nanjing Medical University, Nanjing 210008, China

ZHOU Zhengyang* Nanjing Drum Tower Hospital Clinical College of Nanjing Medical University, Nanjing 210008, China

*Correspondence to: Zhou ZY, E-mail: zyzhou@nju.edu.cn

Conflicts of interest   None.

ACKNOWLEDGMENTS  This article is supported by the National Natural Science Foundation of China No. 81871410, 81671751
Received  2020-06-10
Accepted  2020-09-28
DOI: 10.12015/issn.1674-8034.2020.11.010
Cite this article as: Jiang XQ, Yan CC, Zhou ZY. Study on the correlation between MRI features and KRAS status of rectal cancers before operation. Chin J Magn Reson Imaging, 2020, 11(11): 1004-1009. DOI:10.12015/issn.1674-8034.2020.11.010.

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