Question: Asking about Hairy cell leukemia I get report for my father from hospital it is saying that he have Hairy cell leukemia i am here to ask if this dissease dangerous and there is treatment for it  Also if The one who have it will live for long or not ?  My father age is 55  We discover the dissease by blood test

Reference:
 Hairy cell leukemia Overview Hairy cell leukemia is a rare, slow-growing cancer of the blood in which your bone marrow makes too many B cells (lymphocytes), a type of white blood cell that fights infection. These excess B cells are abnormal and look "hairy" under a microscope. As the number of leukemia cells increases, fewer healthy white blood cells, red blood cells and platelets are produced. Hairy cell leukemia affects more men than women, and it occurs most commonly in middle-aged or older adults. Hairy cell leukemia is considered a chronic disease because it may never completely disappear, although treatment can lead to a remission for years. Symptoms Some people have no signs or symptoms of hairy cell leukemia, but a blood test for another disease or condition may inadvertently reveal hairy cell leukemia. Other times people with hairy cell leukemia experience signs and symptoms common to a number of diseases and conditions, such as: - A feeling of fullness in your abdomen that may make it uncomfortable to eat more than a little at a time - Fatigue - Easy bruising - Recurring infections - Weakness - Weight loss When to see a doctor Make an appointment with your doctor if you have any persistent signs and symptoms that worry you. Causes It's not clear what causes hairy cell leukemia. Doctors know that cancer occurs when cells develop errors in their DNA. In the case of hairy cell leukemia, mutations in the DNA cause your bone marrow stem cells to create too many white blood cells that don't work properly. Doctors don't know what causes the DNA mutations that lead to hairy cell leukemia. Risk factors Certain factors may increase your risk of developing hairy cell leukemia. Not all research studies agree on what factors increase your risk of the disease. Some research indicates that your risk of hairy cell leukemia increases based on your: - Exposure to radiation. People exposed to radiation, such as those who work around X-ray machines or those who received radiation treatment for cancer, may have a higher risk of developing hairy cell leukemia, but the evidence is inconclusive. - Exposure to chemicals. Industrial and agricultural chemicals could play a role in hairy cell leukemia development. However, some studies have found this not to be the case. - Exposure to sawdust. Some studies have found a link between working with wood and sawdust and an increased risk of hairy cell leukemia. But this connection hasn't been proved conclusively. - Ethnicity. Hairy cell leukemia affects men of Ashkenazi Jewish ancestry more frequently than men of other ethnic groups. Diagnosis To diagnose hairy cell leukemia, your doctor may recommend tests and procedures that include: - Physical exam. By feeling your spleen - an oval-shaped organ on the left side of your upper abdomen - your doctor can determine if it's enlarged. An enlarged spleen may cause a sensation of fullness in your abdomen that makes it uncomfortable to eat. Your doctor may also check for enlarged lymph nodes that may contain leukemia cells. - Blood tests. Your doctor uses blood tests, such as the complete blood count, to monitor the levels of blood cells in your blood. People with hairy cell leukemia have low levels of all three types of blood cells - red blood cells, white blood cells and platelets. Another blood test called a peripheral blood smear looks for hairy cell leukemia cells in a sample of your blood. - Bone marrow biopsy. During a bone marrow biopsy, a small amount of bone marrow is removed from your hip area. This sample is used to look for hairy cell leukemia cells and to monitor your healthy blood cells. - Computerized tomography (CT) scan. A CT scan shows detailed images of the inside of your body. Your doctor may order a CT scan to detect enlargement of your spleen and your lymph nodes. Treatment Treatment isn't always necessary for people with hairy cell leukemia. Because this cancer progresses very slowly and sometimes doesn't progress at all, some people prefer to wait to treat their cancer only if it causes signs and symptoms. The majority of people with hairy cell leukemia eventually need treatment. If your hairy cell leukemia causes signs and symptoms, you may decide to undergo treatment. There is no cure for hairy cell leukemia. But treatments are effective at putting hairy cell leukemia in remission for years. Chemotherapy Doctors consider chemotherapy drugs the first line of treatment for hairy cell leukemia. The great majority of people will experience complete or partial remission through the use of chemotherapy. Two chemotherapy drugs are used in hairy cell leukemia: - Cladribine. Treatment for hairy cell leukemia typically begins with cladribine. You receive a continuous infusion of the drug into a vein over several days. Most people who receive cladribine experience a complete remission that can last for several years. If your hairy cell leukemia returns, you can be treated with cladribine again. Side effects of cladribine may include infection and fever. - Pentostatin (Nipent). Pentostatin causes remission rates similar to cladribine, but it's given on a different schedule. People who take pentostatin receive infusions every other week for three to six months. Side effects of pentostatin may include fever, nausea and infection. Biological treatments Biological therapy attempts to make cancer cells more recognizable to your immune system. Once your immune system identifies cancer cells as intruders, it can set about destroying your cancer. Two types of biological treatments are used in hairy cell leukemia: - Interferon. Currently, the role of interferon in hairy cell leukemia treatment is limited. You might receive interferon if chemotherapy hasn't been effective or if you can't take chemotherapy. Most people experience partial remission with interferon, which is taken for a year. Side effects include flu-like symptoms, such as fever and fatigue. - Rituximab (Rituxan). Rituximab is a monoclonal antibody approved to treat non-Hodgkin lymphoma and chronic lymphocytic leukemia, though it's sometimes used in hairy cell leukemia. If chemotherapy drugs haven't worked for you or you can't take chemotherapy, your doctor might consider rituximab. Side effects of rituximab include fever and infection. Surgery Surgery to remove your spleen (splenectomy) might be an option if your spleen ruptures or if it's enlarged and causing pain. Though removing your spleen can't cure hairy cell leukemia, it can usually restore normal blood counts. Splenectomy isn't commonly used to treat hairy cell leukemia, but it may be helpful in certain situations. Any surgery carries a risk of bleeding and infection. Alternative medicine Some people with cancer find that complementary and alternative treatments can help them cope with side effects of cancer treatment. Complementary and alternative medicine can't cure your hairy cell leukemia, but it may offer helpful ways to cope during and after treatment. Talk to your doctor if you're interested in trying: - Acupuncture. A practitioner inserts tiny needles into your skin at precise points during an acupuncture session. Acupuncture may help relieve nausea and vomiting caused by chemotherapy. Acupuncture can be safe when done by a certified practitioner. Your doctor may be able to recommend a practitioner in your community. Acupuncture isn't safe if you have low blood counts or if you're taking blood thinners. - Aromatherapy. Aromatherapy uses fragrant oils that give off pleasant scents, such as lavender. Oils can be massaged into your skin, added to bath water or heated to release their scents. Aromatherapy may help improve your mood and relieve stress. Aromatherapy is safe, but oils applied to your skin can cause allergic reactions, so check the ingredients first. - Massage. A massage therapist uses his or her hands to knead your muscles and soft tissues. Massage may help relieve anxiety and fatigue. Many cancer centers have massage therapists who work with people who have cancer. People with cancer shouldn't have a massage if their blood counts are low. Ask the massage therapist to avoid using deep pressure. A massage shouldn't hurt, so speak up if you feel pain during a massage. - Mind-body therapies. Mind-body therapies may help you relax, and they may help reduce pain. Mind-body therapies include meditation and relaxation techniques, such as guided imagery. Mind-body therapies are generally safe. A therapist can help you with these therapies or you can do them on your own. 

Answer: Hairy cell leukemia progresses slowly and might not require treatment if it does not cause any symptoms. Although there is no treatment, chemotherapy or biological treatment that stimulates the immune system to fight cancer cells  could put hairy cell leukemia in remission for years. Sometimes, removal of the spleen restores normal blood counts.