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As a disease cancer consists of the uncontrolled malignant cellular growth, the invasion of organs and the metastasis. It seams that the cause of the condition is a combination of genetic predisposition and the exposure to some environmental toxins. Basically, the chemotherapy drug’s functioning principle is to impair cell division (mitosis), targeting rapidly-dividing cells. The fact that these drugs destroy cells leads to their being named cytotoxic.

In broad general terms, chemotherapy kills cells by means of chemical substances. Particularly speaking, chemotherapy is used to kill the cells of micro-organisms or cancer. The most common chemotherapy drug regimen is made up from a combination of antineoplastic medication that represents the cytotoxic standardized treatment. Besides the reference to cancer treatment, chemotherapy also has an antibacterial dimension when it involves the use of antibiotics.

A chemotherapy drug, or better a combination of such drugs, functions by destroying cells that divide quickly. Unfortunately, these drugs cannot make a selection between normal fast-dividing body cells and cancer cells. These other cells that get attacked by a chemotherapy drug are digestive tract linings, the bone marrow and the hair follicles. These results on the normal rapid-dividing cells are the side effects of chemotherapy: alopecia – hair loss, myelosuppression – decreased production of blood cells, and mucositis – inflammation of the digestive tract.

A chemotherapy drug could also be prescribed for the treatment of other problems such as autoimmune diseases – namely rheumatoid arthritis and multiple sclerosis. There are newer anti-cancer drugs which were designed to act directly against abnormal proteins in cancer cells; this treatment option is known as targeted therapy.

Different classes of chemotherapy drug medication are available at present. Thus there are antimetabolites, alkylating agents, topoisomerase inhibitors, anthracyclines and several others. Some newer agents, like monoclonal antibodies and tyrosine kinase inhibitors, do not interfere directly with the DNA as do the above mentioned ones.

These ones target a molecular abnormality in peculiar types of cancer such as chronic myelogenous leukemia or gastrointestinal stromal tumors. More special chemotherapy drug options only change the behavior of the tumor cells without affecting other tissues. From these so-called adjuvant therapies, the hormone treatment will be commonly used.

The decision to administer only one chemotherapy drug or a combination of several medicines belongs to the doctor and it is taken depending on the stage of the disease and the purpose of the treatment.

 

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