Momenzadeh H, Mirzai M, Jowkar Z, Geramizadeh B. Frequency of NRAS Gene Mutation in Wild Type KRAS and BRAF Colorectal Cancers; a Single Center Study.
Middle East J Dig Dis 2018;
10:18-23. [PMID:
29682243 PMCID:
PMC5903922 DOI:
10.15171/mejdd.2017.85]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 09/09/2017] [Accepted: 12/01/2017] [Indexed: 11/15/2022] Open
Abstract
BACKGROUND
Incidence of colorectal cancer is increasing in countries such as Iran. Molecular biomarkers
play very important role in the diagnosis, treatment, and prognosis of this cancer. Mutation in the
RAS family (including KRAS and NRAS) is one of these important molecular biomarkers, which
should be tested before starting treatment with anti-EGRF (Epidermal growth factor) drugs.
Objectives: There has been very few reports about the frequency of NRAS mutation from Iran
and no study from south of the country. In this article we will describe our experience about the frequency
of NRAS mutation in colorectal cancers from the largest referral center in the south of Iran.
METHODS
During 5 years (2011-2015), we had 52 cases of colorectal cancers with wild type KRAS and
BRAF in the hospitals affiliated to Shiraz University of Medical Sciences with enough tissue for
molecular studies. NRAS mutation analysis was performed on paraffin embedded formalin fixed
tissue of these cases by polymerase chain reaction (PCR)-sequencing method.
RESULTS
Among these 52 cases of colorectal cancer with wild type KRAS and BRAF, there has been
3 (5.7%) cases with mutant NRAS. One of the mutations has been in codon 12 and two in codon
61. No mutation in codon 13 was found. All the three cases were women with stage IV and well
differentiated histomorphology.
CONCLUSION
Our results showed that frequency of NRAS mutation in colorectal cancer is rare, which is very
close to other studies from different geographic areas of the world.
Collapse