user: What are the treatments for Polycythemia Vera ?

assistant: Polycythemia vera (PV) doesn't have a cure. However, treatments can help control the disease and its complications. PV is treated with procedures, medicines, and other methods. You may need one or more treatments to manage the disease.
                
Goals of Treatment
                
The goals of treating PV are to control symptoms and reduce the risk of complications, especially heart attack and stroke. To do this, PV treatments reduce the number of red blood cells and the level of hemoglobin (an iron-rich protein) in the blood. This brings the thickness of your blood closer to normal.
                
Blood with normal thickness flows better through the blood vessels. This reduces the chance that blood clots will form and cause a heart attack or stroke.
                
Blood with normal thickness also ensures that your body gets enough oxygen. This can help reduce some of the signs and symptoms of PV, such as headaches, vision problems, and itching.
                
Studies show that treating PV greatly improves your chances of living longer.
                
The goal of treating secondary polycythemia is to control its underlying cause, if possible. For example, if the cause is carbon monoxide exposure, the goal is to find the source of the carbon monoxide and fix or remove it.
                
Treatments To Lower Red Blood Cell Levels
                
Phlebotomy
                
Phlebotomy (fle-BOT-o-me) is a procedure that removes some blood from your body. For this procedure, a needle is inserted into one of your veins. Blood from the vein flows through an airtight tube into a sterile container or bag. The process is similar to the process of donating blood.
                
Phlebotomy reduces your red blood cell count and starts to bring your blood thickness closer to normal.
                
Typically, a pint (1 unit) of blood is removed each week until your hematocrit level approaches normal. (Hematocrit is the measure of how much space red blood cells take up in your blood.)
                
You may need to have phlebotomy done every few months.
                
Medicines
                
Your doctor may prescribe medicines to keep your bone marrow from making too many red blood cells. Examples of these medicines include hydroxyurea and interferon-alpha.
                
Hydroxyurea is a medicine generally used to treat cancer. This medicine can reduce the number of red blood cells and platelets in your blood. As a result, this medicine helps improve your blood flow and bring the thickness of your blood closer to normal.
                
Interferon-alpha is a substance that your body normally makes. It also can be used to treat PV. Interferon-alpha can prompt your immune system to fight overactive bone marrow cells. This helps lower your red blood cell count and keep your blood flow and blood thickness closer to normal.
                
Radiation Treatment
                
Radiation treatment can help suppress overactive bone marrow cells. This helps lower your red blood cell count and keep your blood flow and blood thickness closer to normal.
                
However, radiation treatment can raise your risk of leukemia (blood cancer) and other blood diseases.
                
Treatments for Symptoms
                
Aspirin can relieve bone pain and burning feelings in your hands or feet that you may have as a result of PV. Aspirin also thins your blood, so it reduces the risk of blood clots.
                
Aspirin can have side effects, including bleeding in the stomach and intestines. For this reason, take aspirin only as your doctor recommends.
                
If your PV causes itching, your doctor may prescribe medicines to ease the discomfort. Your doctor also may prescribe ultraviolet light treatment to help relieve your itching.
                
Other ways to reduce itching include:
                
Avoiding hot baths. Cooler water can limit irritation to your skin.
                
Gently patting yourself dry after bathing. Vigorous rubbing with a towel can irritate your skin.
                
Taking starch baths. Add half a box of starch to a tub of lukewarm water. This can help soothe your skin.
                
Experimental Treatments
                
Researchers are studying other treatments for PV. An experimental treatment for itching involves taking low doses of selective serotonin reuptake inhibitors (SSRIs). This type of medicine is used to treat depression. In clinical trials, SSRIs reduced itching in people who had PV.
                
Imatinib mesylate is a medicine that's approved for treating leukemia. In clinical trials, this medicine helped reduce the need for phlebotomy in people who had PV. This medicine also helped reduce the size of enlarged spleens.
                
Researchers also are trying to find a treatment that can block or limit the effects of an abnormal JAK2 gene. (A mutation, or change, in the JAK2 gene is the major cause of PV.)