breast cancer is a type of cancer that starts in the breast. it can start in one or both breasts. cancer starts when cells begin to grow out of control.
the breast is an organ that sits on top of the upper ribs and chest muscles. there is a left and right breast and each one has mainly glands, ducts, and fatty tissue. in women, the breast makes and delivers milk to feed newborns and infants. the amount of fatty tissue in the breast determines the size of each breast.
breast cancer occurs almost entirely in women, but men can get breast cancer, too.
determining factors
lobules– the glands that make breast milk. cancers that start here are called lobular cancers.
ducts– small canals that come out from the lobules and carry the milk to the nipple. this is the most common place for breast cancer to start. cancers that start here are called ductal cancers.
nipple– the opening in the skin of the breast where the ducts come together and turn into larger ducts so the milk can leave the breast. the nipple is surrounded by slightly darker thicker skin called the areola.
a less common type of breast cancer called paget disease of the breast can start in the nipple.
fat and connective tissue (stroma)– it surrounds the ducts and lobules and helps keep them in place. a less common type of breast cancer called phyllodes tumour can start in the stroma.
blood vessels and lymph vessels – angiosarcoma is a less common type of breast cancer that can start in the lining of these vessels.
symptoms
an area of thickened tissue in the breast or a lump in the breast or an armpit is usually the first symptom of breast cancer
other symptoms include
armpit or breast pain does not change with the monthly cycle
pitting, like the surface of an orange, or colour changes such as redness in the skin of the breast
a rash around or on one nipple
discharge from a nipple, which may contain blood
an inverted nipple
a change in the size or shape of the breast
peeling, flaking, or scaling of the skin of the breast or nipple
causes
after puberty, a female’s breasts are made up of fat, connective tissue, and thousands of lobules. these are tiny glands that can produce milk. tiny tubes, or ducts, carry the milk toward the nipple.
breast cancer develops as a result of genetic mutations or damage to dna. these can be associated with exposure to estrogen, inherited genetic defects, or inherited genes that can cause cancer, such as the brca1 and brca2 genes.
when a person has cancer, their immune system does not attack the abnormal dna or growths. as a result, cells within breast tissue begin to multiply uncontrollably, and they do not die as usual. this excessive cell growth forms a tumour that deprives surrounding cells of nutrients and energy.
breast cancer usually starts in the inner lining of the milk ducts or the lobules that supply them with milk. from there, it can spread to other parts of the body.
stages
the stage of cancer is determined according to the size of the tumour and whether it has spread to lymph nodes or other parts of the body.
the stages are roughly structured as
stage 0: ductal carcinoma in situ.
the cancerous cells are only within the ducts and have not spread to surrounding tissues.
stage 1: here, the tumour measures up to 2 centimetres (cm) across.
it has not affected any lymph nodes, or there are small groups of cancer cells in the lymph nodes.
stage 2: the tumour is 2 cm across and has started to spread to nearby nodes, or it is 2–5 cm across and has not spread to the lymph nodes.
stage 3: the tumour is up to 5 cm across and has spread to several lymph nodes, or the tumour is larger than 5 cm and has spread to a few lymph nodes.
risk factors
the following factors make developing breast cancer more likely
age– the risk of breast cancer increases with age.
genetics– a person with certain mutations in the brca1 and brca2 genes has a higher chance of developing breast cancer, ovarian cancer, or both. people inherit these genes.
mutations in the tp53 gene also have links to increased breast cancer risk.
if a close relative has or has had breast cancer, a person’s chance of developing breast cancer increases.
history of breast cancer or breast lumps– a person who has had breast cancer is more likely to develop it again than a person with no history of the disease.
having some types of noncancerous breast lumps also increases the risk of developing cancer later on.
dense breast tissue– dense breast tissue is more likely to be associated with a diagnosis of breast cancer.
oestrogen exposure and breastfeeding– extended exposure to oestrogen appears to increase the risk of breast cancer.
this exposure could involve starting periods at an early age or entering menopause late.
breastfeeding, especially for over 1 year appears to reduce the risk of developing breast cancer. this may be due to the drop in oestrogen exposure that follows pregnancy and breastfeeding.
body weight– obesity after menopause may contribute to a greater likelihood of developing breast cancer, possibly due to increased estrogen levels.
high sugar intake may also be a factor.
alcohol consumption– regularly drinking high amounts of alcohol appears to play a role in breast cancer development.
radiation exposure – undergoing radiation treatment for different cancer may increase the risk of developing breast cancer later in life.
hormone treatments – studies have shown that oral contraceptives may slightly increase the risk of breast cancer. studies have found that hormone replacement therapy, specifically oestrogen-progesterone therapy, is related to an increased risk of breast cancer.
treatment
the most effective approach depends on several factors, including:
type and stage of the cancer
sensitivity to hormones
person’s age, overall health, and preferences
the main treatment options include
radiation therapy– it involves targeting the tumour with controlled doses of radiation that kill any remaining cancer cells.
surgery
lumpectomy: removal of the tumour and a small amount of healthy tissue around it.
helps in preventing the spread of cancer.
it is the preferred option if the tumour is small and easy to separate from surrounding tissue.
mastectomy: it involves removing the breast’s lobules, ducts, fatty tissue, nipple, areola, and some skin.
in some types, a surgeon also removes the lymph nodes and muscles in the chest wall.
sentinel node biopsy: if breast cancer reaches the sentinel lymph nodes, the first nodes to which it can spread, it can travel to other parts of the body through the lymphatic system. if the doctor does not find cancer in the sentinel nodes, it is usually not necessary to remove other nodes. you may contact the professionals at our breast cancer hospital in hyderabad to know more about the sentinel node biopsy.
axillary lymph node dissection: if cancer cells are found in the sentinel nodes, it is recommended to remove several lymph nodes in the armpit. this can prevent cancer from spreading.
biological therapy, or targeted drug therapy- targeted drugs can destroy specific types of breast cancer, such as:
trastuzumab (herceptin)
lapatinib (tykerb)
bevacizumab (avastin)
hormone therapy- it is used to prevent hormone-sensitive breast cancers from returning after treatment.
the therapy may help treat oestrogen receptor-positive and progesterone receptor-positive cancers.
it also helps to prevent hormone-sensitive breast cancers from returning after treatment.
healthcare professionals usually administer it after surgery, though in some cases they may do so beforehand to shrink the tumour.
hormone-blocking therapy may be the only suitable option for people who are not eligible for surgery, chemotherapy, or radiotherapy.
examples of hormone-blocking medications may include:
tamoxifen (nolvadex)
aromatase inhibitors
ovarian ablation or suppression
goserelin (zoladex)
chemotherapy- cytotoxic chemotherapy drugs to kill cancer cells if there is a high risk of recurrence or spread.
there are mainly two forms of chemotherapy
adjuvant chemotherapy- chemotherapy after surgery
neoadjuvant chemotherapy.- chemotherapy before surgery
prevention
a person can take the following steps to significantly reduce the risk of breast cancer.
limiting alcohol consumption
a healthy diet with plenty of fresh fruit and vegetables
ample exercise
maintaining a moderate body mass index
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