Cancer is the disease but have a medical treatments so do not worry

*) CANCER DEFINITION :
Cancer is a group of diseases in which cells are aggressive (grow and divide without respect to normal limits), invasive (invade and destroy adjacent tissues), and/or metastatic (spread to other locations in the body)

*) CANCER IN HUMAN-BEING LOGIC :
These three malignant properties of cancers differentiate them from benign tumors, which are self-limited in their growth and do not invade or metastasize (although some benign tumor types are capable of becoming malignant).
Cancer may affect people at all ages, even fetuses, but risk for the more common varieties tends to increase with ageCancer causes about 13% of all deaths.Apart from people, forms of cancer may affect animals and plants. Nearly all cancers are caused by abnormalities in the genetic material of thetransformed cells.These abnormalities may be due to the effects of carcinogens, such as tobacco smoke, radiation, chemicals, or infectious agents.Other cancer-promoting genetic abnormalities may be randomly acquired through errors in DNA replication, or are inherited, and thus present in all cells from birth.

*) CANCER TREATMENTS BUT TOO MUCH EXPENSIVE BUT EFFECTIVE :

1_ Chemotherapy treatment uses medicine to weaken and destroy cancer cells in the body, including cells at the original cancer site and any cancer cells that may have spread to another part of the body. Chemotherapy, often shortened to just "chemo," is a systemic therapy, which means it affects the whole body by going through the bloodstream.

There are quite a few chemotherapy medicines. In many cases, a combination of two or more medicines will be used as chemotherapy treatment for breast cancer.

2_ Chemotherapy is used to treat:

early-stage invasive breast cancer to get rid of any cancer cells that may be left behind after surgery and to reduce the risk of the cancer coming back advanced-stage breast cancer to destroy or damage the cancer cells as much as possible
In some cases, chemotherapy is given before surgery to shrink the cancer.

In this section, you'll learn more about how chemotherapy works, chemotherapy medicines, and what to expect with chemotherapy. You also can learn about chemotherapy side effects and ways to manage them.