Low Expression of MicroRNA335-5p Is Associated with Malignant Behavior of Gallbladder Cancer: A Clinicopathological Study

Document Type: Research Articles

Authors

1 Department of Pathology, Era’s Lucknow Medical College & Hospital, Lucknow, India.

2 Department of Surgical Gastroenterology, King George’s Medical University, Lucknow India.

3 Department of Biochemistry, Era’s Lucknow Medical College & Hospital, Lucknow, India.

4 Department of Surgical Oncology, King George’s Medical University, Lucknow India.

Abstract

Background: MicroRNAs (miRNAs) are non-coding RNAs that regulate multiple cellular processes during cancer
progression, identified to be involved in tumorgenesis of several cancers including cancers of digestive system. However
its role in gallbladder inflammatory disease (GID) and gallbladder cancer (GBC) has not been well documented.
The present study was aimed to investigate the clinical significance of hsa-miRNA-335-5p (miR-335) in GBC and
GID. Subjects and Methods: This prospective case control study, conducted from July 1, 2014 to December 1, 2017
in Era’s Lucknow Medical College & Hospital, India, evaluated miR-335 expression by real-time polymerase chain
reaction. Hundred tissue samples GID (control; n=50) and GBC (case; n=50) were studied. Relative quantification of
target miR-335 expression was examined using the comparative cycle threshold method. Their expression was correlated
with different clinicopathological parameters. Fishers’ exact test, Student’s t-test, and Chi-square test were used as
appropriate for data analysis. Kaplan-Meier methods were used to calculate overall and disease-free survival rate.
Two sided PGBC lesions when compared with GID lesions (P<0.001). The low expression level of miR-335 was correlated with
histological grade (P=0.007), clinical stage (P<0.001), lymph node metastasis (P<0.001) and liver metastasis (P=0.016).
Reduced expression of miRNA-335 was associated with a shorter median overall survival (7 months vs. 25 months)
in GBC patients (P<0.001). Conclusions: Down regulation of miR-335 is associated with the severity of the disease
and thus indicate that miR-335 expression may serve as prognostic marker for GBC.

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