It begins from breast cells and poses a challenge to the health of mankind and women in particular. The term "breast cancer" refers to a number of malignant diseases in the breast tissue, primarily the lobules-producing glands or the ducts that carry milk to the nipple. It is termed invasive or non-invasive, depending on whether the cancer cells have outgrown their site or not, such as invasive, a very common form of cancer in women worldwide.
Breast cancer is one of the most common cancers in women, although it can also occur in men at a much lower rate. While many different things characterize this condition as a disease, such factors include its manifestation (heterotypic manifestations or mechanical manifestations), severity, and response to treatment for different patients. Factors such as genetic, environmental, and hormonal influences will work in the complex interaction and development of breast cancer. Especially if close people have been affected by this disease, having a family history of breast cancer will usually increase the risk of breast cancer for close relatives as well, which suggests that there is a specific genetic predisposition to this condition.
The biology of breast cancer actually involves the abnormal growth of breast cells. These can develop into lumps or masses that can be identified as palpable or visible through mammograms, ultrasound or MRI. The masses can be non-cancerous (benign) or cancerous (malignant). These malignant masses invade neighbouring tissues and spread (i.e. metastasize) to other sites in the body, including the lungs, liver, bones and brain; thus, breast cancer can be a life-threatening disease if not diagnosed and treated at the appropriate time.
The most prevalent subtype of breast cancer is invasive ductal carcinoma (IDC), which arises from the milk duct and spreads to neighboring tissues. An important type is invasive lobular carcinoma (ILC), which arises from the lobules responsible for making milk. Hence, due to their ability to invade beyond the ducts or lobules that make up these organs, these are called invasive breast cancers. In contrast, in situ carcinoma or non-invasive breast cancer refers to cancer that remains only in the area of origin and has not metastasized to nearby health tissues. This is mostly ductal carcinoma in situ (DCIS), which is a very common type of non-invasive breast cancer and is considered a precursor to invasive cancer.
Breast cancer risk factors include a large number of modifiable and non-modifiable factors. Non-modifiable risk factors are simply age, sex, genetics, and family history. Age is one of the most important risk factors as the risk increases with increasing age – the greatest increase occurs after the age of fifty. Gender is also a major factor, as breast cancer in men is about 100 times less common than in women. Genetic mutations such as the BRCA1 and BRCA2 genes significantly increase the risk of breast cancer. These genes normally function by repairing damage to DNA; however, mutations can lead to abnormal growth of cells and increase the risk of cancer. Family history is an important factor, whereby the more close relatives suffer from breast cancer, the greater the risk of a woman developing the disease.
Physical activity, dietary habits, alcohol use and hormone replacement therapy (HRT) constitute modifiable lifestyle-related risk factors. An active lifestyle, healthy weight and nutritious diet may reduce the risk of breast cancer in some women. On the other hand, obesity and drinking too much alcohol may increase the risk even more. Long-term combined use of hormonal replacement therapy, especially estrogen-progesterone, has been proven to be associated with breast cancer.
The symptoms of breast cancer often vary according to their type and the stage of the disease or condition. The following characteristics are typical of a breast lump: its presence in the breast, changes in the size or shape of the breast, certain changes in the skin (such as fading or dimpling), pain or tenderness in the breast, and discharge from the nipple. Not all breast cancers are manifested by obvious symptoms - an excellent reason for all women over the age of 40 to undergo regular screening through mammography. Early detection of breast cancer would rightly be considered a breakthrough for successful treatment because as with most diseases, the sooner it is detected, the easier it is to treat.
Diagnosis involves several things such as a physical examination, imaging tests, and biopsy. A physical examination may be performed by a health care provider to check the breast for lumps or other abnormalities. Imaging tests, such as mammograms, ultrasounds, and MRI scans, on the other hand, will help determine the size, location, and characteristics of any suspicious areas in the breast. And if a potential tumor is found, a biopsy will be performed to remove a small sample of tissue for examination under a microscope. This is important to confirm whether these cells are cancerous or not and determine the type of breast cancer and its characteristics, such as whether it is hormone receptor-positive or HER2-positive, which have an impact on treatment.
Breast cancer staging includes important indications of how the extent of the disease and the most appropriate treatment can be defined. The stages of breast cancer include: stage 0, which is represented by cancer that could not invade or for which there is no evidence of invasion; and stage IV, which involves metastasis of the disease to distant parts from the primary site. Staging also includes tumor-seized local spread to regional lymph nodes and distant metastasis. For preferred treatment, biomarkers such as estrogen receptors (ER), progesterone receptors (PR), and human epidermal growth factor receptor 2 (HER2) contribute greatly to such treatment options. Indeed, tumors that are positive for ER or PR agents respond better to hormones, while tumors that are positive for HER2 have better results to therapy blocking HER2.
Breast cancer treatment is specific based on the type and stage of cancer, specific biomarkers detected, and the patient's overall health and preferences. Several treatment modalities have been used, and they include surgery, radiation therapy, chemotherapy, hormone therapy, targeted therapy, and immunotherapy. Surgery is often the first line of treatment and may involve removal of the tumor (lumpectomy) or removal of the entire breast (mastectomy). Removal of nearby lymph nodes may also be required to assess the possible spread of the disease.
Radiation therapy uses high-energy rays directed at cancer cells to destroy them. This method is often used after surgery to clear remaining cancer cells from the breast or surrounding tissues. Chemotherapy involves the involvement of powerful drugs in killing cancer cells, but it is usually combined with other modalities in most cases of aggressive or advanced cancer. Hormonal therapy is another form in which the effects of estrogen or progesterone on hormone receptor-positive channels are blocked, thereby slowing or stopping the growth of such tumor cells. Targeted therapies are other drugs that target cancer cells with certain genetic mutations or overly expressed proteins such as HER2. Immunotherapy, the newest approach, works by activating the immune system to identify and eliminate tumors.
Research on breast cancer continues to improve, leading to more custom-tailored treatment strategies. A fundamental example of a personalized treatment approach is genomic testing. This identification of the cellular genetic composition of breast cancer tumors facilitates treatment conditions tailored to these specific characteristics. Other treatments include immunotherapy and targeted therapy, which herald a bright future for treatment options, especially in cases of safe long-term outcomes – tight spots in the future for metastatic and resistant types of cancer.
Due to the progress made from the past to the present, breast cancer survival rates have steadily improved. The main reason for the improvement in these survival rates is the development and accuracy of early detection and treatment. Rates vary according to several factors defined at the time, with regard to the stage of the disease at diagnosis, the type of disease, and the overall health of the patient. In most early cases of breast cancer, survival is likely to be high, with many patients surviving for many years even after treatment. As the disease progresses, the chance of survival decreases, except when it has already metastasized to distant organs.
Prevention of breast cancer includes modifications in one's lifestyle such as achieving a healthy weight, engaging in regular physical activity, limiting alcohol intake and breastfeeding to reduce the rate of breast cancer development. Preventive measures for women with very high genetic risk such as BRCA mutations include prophylactic mastectomy (removal of breasts) or prophylactic oophorectomy (removal of ovaries) at risk to reduce the incidence rate of breast and ovarian cancer. Women at risk of developing breast cancer can undergo chemoprevention by tamoxifen or aromatase inhibitors.
This type of cancer involves complex complications and multifactorial effects and occurs in a very large number of women i.e. millions. Many of these cancers are emerging from various mutations in the genetic material, hormonal imbalances and various environmental factors. This disease, which mostly destroys women's health through morbidity and mortality, was found to have a brighter outlook in the past with the possibility of early detection rates, better treatment methods, and increased preventive measures; therefore, the disease is now more manageable for many women. Furthermore, continued research continues to prove the possibility of better treatments and prevention so that eventually affected women will have even better prospects.
