Breast Cancer Assignment 2022

Running head: BREAST CANCER
BREAST CANCER
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BREAST CANCER
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Introduction Breast -Breast carcinoma
Part A
Breast carcinoma is one of the type of neoplasm which arise from the breast tissue.
Among that the most common is the adenocarcinoma of those cells which underlines the
terminal duct lobular unit. Breast cancer is the common cancer among the women with 89%
death rate globally. The pathophysiology of the breast cancer can be understood as hormonal and
hereditary form of cancer. As per the study of Bland et al. (2017) it is understood that with breast
cancer requires hormone to grow and its incidence arise by the exposure of estrogen hormone.
78% of the breast cancer is hormone sensitive, which can be attributed by the fact that it carries
estrogen receptor and divide and grow in response of the hormone stimulation (Wefel et al.
2015). Estrogen receptor are basically of two type alpha and beta. The cells of breast express
these receptor mainly the ER alpha. When there is high amount of estrogen, it bind with the
receptor and the complex moved to the nucleus which causes formation of the transcription
protein which increase the cell division and result in imbalance of regulation of cell cycle. The
high degree of cell division result in breast carcinoma (Bloom et al. 2016).
In order to understand the pathophysiology of the breast cancer, it is important to
evaluate the gene expression of the BRCA1 and BRCA2 which is a type of tumour suppressor
gene. The major function of the gene is to code for the protein which is required in DNA repair
pathway which is necessary to protect against mutation (D.J et al. 2016) In breast cancer, there is
loss of function of these two genes which is linked with breast cancer in women. Such breast
cancer are ER (estrogen receptor) and PR (progesterone receptor) positive. There are many cause

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of the mutation in these gene which can be environmental, hormonal and genetic. According to
the study of Szabo (2016) it was seen that the mutated gene are inherited to next generation.
Jafari et al. (2018) has studied the role of Human epidermal growth factor which is also
associated with breast cancer. The Human epidermal growth factor receptor is proto-oncogene
which remain in inactive state. The main function of the gene is to code for growth factor that
increase the division of cell. The regulation of the cell is under control and in regulation. In
breast cancer, due to gain in mutation, EGFR are overexpressed and is associated with the
growth of malignant tumour in breast.
The guardian of cell cycle is P53 protein which is a tumour suppressor protein whose
major function is growth arrest, apoptosis and DNA repair. In breast cancer, the P53 is mutated
and there is loss of function of gene (Semenza 2016). Due to this, there is irregular division of
cell and DNA repair pathway is disrupted. The continue division of cell is not arrested and result
in breast cancer.
Part B. Sonographic appearance of breast cancer
Source: (Johnson and Hwang 2015).