Chemotherapy: 8 Common Myths and Misconceptions De
Doctors around the world have been advising chemotherapy to patients since... Read More
Chemotherapy is a category of standardized drug administration of various types for the treatment of cancer. With a curative intent, some combinations of drugs are administered to a patient to prolong their life and also to bring about a reduction in the symptoms shown by the patient. Chemotherapy treatment is considered to be one of the major categories of medical oncology. Many people around the world are prescribed to undergo chemotherapy treatment instead of undergoing a surgical procedure. But many are frightened with the side effects of this treatment as it is believed to reduce the quality of life of the patients.
Chemotherapy is a procedure where non-specific intracellular poisons are used, which are specifically related to preventing the process of mitosis or the natural cell division of the cancerous cells. This technique rather excludes those agents that are responsible for selective extracellular growth signal blockade (signal transduction blockers). If spoken about these agents used in chemotherapy, it has been found that most of them are cytotoxic in nature due to their property of interfering with natural mitosis. However, the cells of cancer can differ widely in terms of showing susceptibility to these administered agents.
Chemotherapy can be defined as a way of mass destruction of stress cells, which would eventually lead to the death of the cells when apoptosis is initiated. The commonly known side effects of chemotherapy can be traced back to the process of damaging normal non-cancerous cells, which are in the process of rapid division. They are sensitive to anti-mitotic drugs that are being administered to the patient and such cells may include the cells of the hair follicles, digestive tract lining, and bone marrow. But nowadays treatment options have undergone a lot of modification by which these side effects can be well countered.
Various options of drugs are available to treat different types of cancer including the following:
Alkylating agents: These kinds of agents prove to be extremely beneficial during the cell’s resting phase. The various kinds of alkylating agents that are employed in chemotherapy treatment include the following:
Nitrosoureas are unique from the rest for choices in chemotherapy treatment due to their ability to cross the blood-brain barrier and treating tumors of the brain.
Plant alkaloids: Plant alkaloids employed for chemotherapy treatment are derived from plants. These include vinca alkaloids, taxanes, podophyllotoxins, and camptothecan analogs. The plant alkaloids are cell cycle specific agents, which enables them to attack the dividing cells in various stages of their division cycle.
Antimetabolites: This kind of chemotherapy treatment involves substances that are similar in composition to the normal substances present in the cell. When these substances get incorporated in the process of cellular metabolism, then the cell is no longer able to divide. They are also cell cycle specific and can be classified further according to the substance in the cell with which they interfere.
Topoisomerase inhibitors: When the topoisomerase enzymes in the body ( topoisomerase I and II) are inhibited as a result of chemotherapy drugs, then those drugs are referred to as topoisomerase inhibitors. During the chemotherapy, the topoisomerase enzymes are responsible for controlling structural manipulation of the DNA which is necessary for the purpose of replication.
Miscellaneous antineoplastics: Different types of drugs make each chemotherapy treatment process unique. Enzymes, retinoids, adrenocortical steroid inhibitor, ribonucleotide reductase inhibitor or antimicrotubule agents can be used as chemotherapy drugs.
There are no significant preparations required before chemotherapy. You should talk to your specialist before the treatment about the possible side effects and the ways to manage them. You should come to the hospital in comfortable clothing and bring something light to eat if the session is expected to last a couple of hours.
You can even bring a book to read or an mp3 player to listen to your songs if you are scheduled to receive drugs intravenously. This will also help divert your attention.
Some of the chemotherapy drugs are involved in damaging the cell at the time of splitting while others do their jobs when the gene copies are being made by the cell prior to division. The cells that are in resting phase are very less likely to get damaged. Different kind of drugs damage the cells at different stages and hence a combination of various drugs will increase the chance of damaging more number of cancer cells.
Chemotherapy drugs can be given in a variety of ways. At times due to the destructive nature of stomach enzymes, some of the drugs are impossible to administer as pills. While for other drugs the effects are better realized when administered intravenously. Some of them can be injected into muscles while other can be given directly to the abdominal cavity and bladder directly.
Oral chemo medications: They are administered orally and are available in various forms such as liquids, tablets, capsules, and pill. All these forms can be absorbed by the stomach or under the tongue. The protective coating around them is broken down by digestive juices of the stomach and then the medication is directly absorbed by the lining of the stomach. There are some which have a certain amount of time delay between the administration and the actual release of the medicine.
Subcutaneous injection: With the help of a short needle, the drug is administered into the region between the muscle and skin but it does not penetrate as far as the layer of muscles. They are used for some biologic response modifiers and support drugs of chemotherapy. If the platelet count of the patient is low, then it is less likely that such injections can cause any bleeding more than that in case if it was an intra muscular injection.
Intra muscular chemo injections: In this case, the injection penetrates the muscle layer and a large needle has to be used for this so that the medication gets deposited in the tissues of the muscle. Most chemotherapy cannot be implemented via intramuscular injection owing to its harshness. People with low platelet counts are not advised with this due to the possibility of bleeding within the muscle.
Intravenous chemo treatments: This also gets absorbed rapidly in the circulation system in the body. It offers more flexibility, thus making it more common. Continuous infusions are ensured through this method for days and weeks if required. Some of the types of intravenous infusions include the following:
Intraventricular chemo treatments: In this procedure, the drugs are meant to reach the cerebrospinal fluid. The blood-brain barrier stops many drugs to reach it and hence in two ways it can be done; one is the lumbar puncture and the other is Ommaya reservoir. A dome-shaped device with a catheter attached is placed in the subcutaneous layer on the scalp. It is threaded to the lateral ventricle of the brain. A small needle is placed through the ommaya reservoir to inject drugs. This is good for chemotherapy for leukemia.
Intraperitoneal chemo treatment: In this case, the drug can be directly drained into the abdominal cavity, the general cavity surrounding the organs. The organs, as a result, get bathed in the medication before it gets absorbed into the tumor site.
Intra arterial chemo treatments: Here the drug is given directly to the artery supplying blood to a tumor. This kind of treatment is beneficial for colon cancer, limb melanoma, pancreatic cancer, gastric cancer, and some other forms of cancer.
Intravesicular chemo treatments: A urinary catheter is used to access the urinary bladder and useful for people suffering from superficially invasive bladder cancer.
Intrapleural chemo treatments: This is the chemotherapy for lung cancer where the drug is administered in the pleural cavity to control malignant pleural effusions and used for symptom relief.
Implantable chemotherapy treatment: Gliadel wafer can be placed in the cavity after removal of tumor in the brain. It can be left for 2 or 3 weeks to ensure that all cancer cells are finally killed in the area surrounding the brain tumor site.
Topical chemo treatments: In this case, a cream is applied to the skin and used to treat cancerous lesions on the skin itself. Not used very commonly but used for treating skin cancer.
For patients who can tolerate a high dose of drugs, chemotherapy cycle is carried out in a single go after every three weeks. For patients who are not expected to tolerate a high dose of drugs, the same cycle is split into two or three light doses, which are administered at an interval of a week.
The platelet and white blood cells count may drop after each cycle of chemotherapy, which usually recovers on its own if proper diet is maintained. Some patients may experience loss of appetite. It is important for them and all other patients to take plenty of fluids and plain water to recover after chemotherapy. This will reduce fatigue, weakness, and joint pain while restoring the platelet and WBC count.
Patients are advised to take the emergency medicine prescribed by the doctor in case they experience pain, vomiting, nausea, or general sickness. Inform the specialist immediately in case of any adverse reactions.
Q: What is the cost of chemotherapy?
A: The average chemotherapy cost may vary from $1000 to $30,000. The average cost of chemotherapy varies depending on the mode of drug administration, the number of cycles conducted, and the dosage of drugs used.
Q: Can I fight the side effects of chemotherapy?
A: Yes with palliative care, now it is possible to fight the side effects to a large extent associated with chemotherapy.
Q: What are the side effects of chemotherapy?
A: Nausea, general fatigue, diarrhea, constipation, weakness, and hair loss are some of the side effects of chemotherapy that a patient may experience.
Q: How long do side effects of chemotherapy last?
A: However normal cells have the ability to repair themselves and replace the cells that have been damaged by the chemotherapy drugs. So the effect of damage will not last for very long and will disappear once the treatment is over. Specific types of side effects such as diarrhea will occur only during the time when drugs are being administered.
Doctors around the world have been advising chemotherapy to patients since... Read More
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