Friborg, and Melbye, 2007)
This study proves the link between the EBV
infection and the incidence of breast cancer, but only
a small proportion of positive EBV cases develop into
breast cancer. This shows that only EBV alone is not
enough as an etiological factor in carcinogenesis, a
number of biological and environmental cofactors are
also needed for the occurrence of breast cancer
(Alshammari, 2017).
The results of our study have significant statistical
association of EBV infection with tumor size. This
result is in accordance with some studies
conductedpreviously. Arbach in his research found
that EBV infection in breast cancer cells can increase
the ability of these tumor cell mutations such as
invasion, angiogenesis, and metastasis. As in the case
of nasopharyngeal cancer, the LMP-1 oncoprotein
produced by EBV induces cyclooxygenase 2 (COX-
2) which then induces vascular endhotelial growth
factor that plays a role in the process of angiogenesis
through NF-κB signaling (Arbach et al., 2015).
LMP-1 is directly related to oncogenesis, because
it is able to activate several cellular signaling
pathways such as Nuclear Factor-κB, c-Jun NH2-
terminal kinase (JNK), p38 kinase,
phosphatidylinositol 3-kinase (PI3K), and several
other possible pathways. thereby resulting in
continuous proliferation and inhibits apoptosis (Sun
et al.,2015)
One of the oncoproteins found in Epstein-Barr
virus is EBNA-1. The oncogenic role of EBNA-1
protein has been reported by some previous
researchers. EBNA-1 can reduce p53 levels by
triggering ubiquitin specific protease USP7 so that
p53 becomes unstable. In the end the breast gland
epithelium is infected with EBV so that the cells
become proliferated continuously and anti-apoptotic
(Frappier, 2012)
The results of our study have significant statistical
association of EBV infection with The metastatic
status of axillary lymph nodes and lymphovascular
invasion status. These findings come in agreement
with studies conducted by Fessahaye et al., 2017. Our
study shows that tumor cells contained in the EBV
gene have the potential for metastases to occur, which
suggest aggressive tumor behaviour, and making
them a poor prognostic factor. Arbach et al. who
showed that EBV infection of breast tumor enhances
its mutagenic properties, such as invasion,
angiogenesis, and metastasis.
5 CONCLUSION
The conclusion of this study is, there are significant
statistical association in the status of axillary lymph
nodes, lymphovascular invasion status and tumor size
in breast cancer samples infected by EBV and those
not infected by EBV.
REFERENCES
Ahmed ES, Elnour LS, Siddig EE and Hassan R. Molecular
detection of Epstein-Barr virus in breast cancer among
Sudanese female population: a case-control study
[version 1; peer review: 2 not approved].
F1000Research 2019, 8:1355
(https://doi.org/10.12688/f1000 research.19422.)
Alshammari F A, Association between HPV , CMV , EBV
and HS Viruses and Breast Cancer in Saudi Arabia, J.
Cancer Prev. Curr. Res., 2017, vol. 7, no. 3, pp. 1–7
Arbach H, Viglasky V, Lefeu F, Guinebretière JM, Ramirez
V, Bride N, Boualaga N, Bauchet T, Peyrat JP, Mathieu
MC, Mourah S, Podgorniak MP, Seignerin JM, Takada
K, Joab I. Epstein-Barr virus (EBV) genome and
expression in breast cancer tissue: effect of EBV
infection of breast cancer cells on resistance to
paclitaxel (Taxol). J Virol. 2006 Jan;80(2):845-53. doi:
10.1128/JVI.80.2.845-853.2006. PMID: 16378986;
PMCID: PMC1346837.
Alibek K, Kakpenova A, Mussabekova A, Sypabekova M,
Karatayeva N. Role of viruses in the development of
breast cancer. Infect Agent Cancer. 2013;8:32.
Published 2013 Sep 2. doi:10.1186/1750-9378-8-32
Bray, F., Ferlay, J., Soerjomataram, I., Siegel, R.L., Torre,
L.A. and Jemal, A. (2018), Global cancer statistics
2018: GLOBOCAN estimates of incidence and
mortality worldwide for 36 cancers in 185 countries.
CA: A Cancer Journal for Clinicians, 68: 394-424.
https://doi.org/10.3322/caac.21492.
Carter CL, Allen C, Henson DE. Relation of tumor size,
lymph node status, and survival in 24,740 breast cancer
cases. Cancer. 1989 Jan 1;63(1):181-7. doi:
10.1002/1097-0142(19890101)63:1<181::aid-
cncr2820630129>3.0.co;2-h. PMID: 2910416
Chang Y, Moore PS, Weiss RA. Human oncogenic viruses:
nature and discovery. Philos Trans R Soc Lond B Biol
Sci. 2017;372(1732):20160264.
doi:10.1098/rstb.2016.0264
Cianfrocca M, Goldstein LJ. Prognostic and predictive
factors in early-stage breast cancer. Oncologist.
2004;9(6):606-16. doi: 10.1634/theoncologist.9-6-606.
PMID: 15561805.
Fessahaye G, Elhassan AM, Elamin EM, Adam AM,
Anghesom Ghebremedhin A, Ibrahim ME. Association
of Epstein - Barr virus and breast cancer in Eritrea.
Infect Agents Cancer 12, 62 (2017).
https://doi.org/10.1186/s13027-017-0173-2