Plasma cells develop from B lymphocytes (B cells), a type of white blood cell that is made in the bone marrow. Normally, when bacteria or viruses enter the body, some of the B cells will change into plasma cells. The plasma cells make antibodies to fight bacteria and viruses, to stop infection and disease.
Plasma cell neoplasms are diseases in which abnormal plasma cells form tumors in the bones or soft tissues of the body. The plasma cells also make an antibody protein, called M protein, that is not needed by the body and does not help fight infection. These antibody proteins build up in the bone marrow and can cause the blood to thicken or can damage the kidneys.
Monoclonal gammopathy of undetermined significance (MGUS) is not cancer but can become cancer. The following types of plasma cell neoplasms are cancer:
Plasma cell neoplasms include the following:
In this type of plasma cell neoplasm, less than 10% of the bone marrow is made up of abnormal plasma cells and there is no cancer. The abnormal plasma cells make M protein, which is sometimes found during a routine blood or urine test. In most patients, the amount of M protein stays the same and there are no signs, symptoms, or health problems.
In some patients, MGUS may later become a more serious condition, such as amyloidosis, or cause problems with the kidneys, heart, or nerves. MGUS can also become cancer, such as multiple myeloma, lymphoplasmacytic lymphoma, or chronic lymphocytic leukemia.
In this type of plasma cell neoplasm, the abnormal plasma cells (myeloma cells) are in one place and form one tumor, called a plasmacytoma. Sometimes plasmacytoma can be cured. There are two types of plasmacytoma.
Signs and symptoms depend on where the tumor is.
In multiple myeloma, abnormal plasma cells (myeloma cells) build up in the bone marrow and form tumors in many bones of the body. These tumors may keep the bone marrow from making enough healthy blood cells. Normally, the bone marrow makes stem cells (immature cells) that become three types of mature blood cells:
As the number of myeloma cells increases, fewer red blood cells, white blood cells, and platelets are made. The myeloma cells also damage and weaken the bone.
Sometimes multiple myeloma does not cause any signs or symptoms. This is called smoldering multiple myeloma. It may be found when a blood or urine test is done for another condition. Signs and symptoms may be caused by multiple myeloma or other conditions. Check with your doctor if you have any of the following:
A tumor can damage the bone and cause hypercalcemia (too much calcium in the blood). This can affect many organs in the body, including the kidneys, nerves, heart, muscles, and digestive tract, and cause serious health problems.
Hypercalcemia may cause the following signs and symptoms:
In rare cases, multiple myeloma can cause peripheral nerves (nerves that are not in the brain or spinal cord) and organs to fail. This may be caused by a condition called amyloidosis. Antibody proteins build up and stick together in peripheral nerves and organs, such as the kidney and heart. This can cause the nerves and organs to become stiff and unable to work the way they should.
Amyloidosis may cause the following signs and symptoms:
Anything that increases a person's chance of getting a disease is called a risk factor. Not every person with one or more of these risk factors will develop plasma cell neoplasms, and they will develop in people who don't have any known risk factors. Talk with your doctor if you think you may be at risk.
Plasma cell neoplasms are most common in people who are middle aged or older. For multiple myeloma and plasmacytoma, other risk factors include the following:
Studies about how racial, social, and financial factors affect access to treatment and rates of plasma cell neoplasms are ongoing.
In addition to asking about your personal and family health history and doing a physical exam, your doctor may perform the following tests and procedures:
The prognosis depends on the following:
Treatment options depend on the following:
The process used to find out the amount of cancer in the body is called staging. It is important to know the stage in order to plan treatment.
The following tests and procedures may be used to find out how much cancer is in the body:
Beta-2-microglobulin and albumin are found in the blood. Beta-2-microglobulin is a protein found on plasma cells. Albumin makes up the biggest part of the blood plasma. It keeps fluid from leaking out of blood vessels. It also brings nutrients to tissues, and carries hormones, vitamins, drugs, and other substances, such as calcium, all through the body. In the blood of patients with multiple myeloma, the amount of beta-2-microglobulin is increased and the amount of albumin is decreased.
In stage I multiple myeloma, the blood levels are as follows:
In stage II multiple myeloma, the blood levels are in between the levels for stage I and stage III.
In stage III multiple myeloma, the blood level of beta-2-microglobulin is 5.5 mg/L or higher and the patient also has one of the following:
Plasma cell neoplasms are called refractory when the number of plasma cells keeps going up even though treatment is given. Plasma cell neoplasms are called relapsed when they have come back after treatment.
Different types of treatments are available for patients with plasma cell neoplasms. Some treatments are standard (the currently used treatment), and some are being tested in clinical trials. A treatment clinical trial is a research study meant to help improve current treatments or obtain information on new treatments for patients with cancer. When clinical trials show that a new treatment is better than the standard treatment, the new treatment may become the standard treatment. Patients may want to think about taking part in a clinical trial. Some clinical trials are open only to patients who have not started treatment.
Chemotherapy is a cancer treatment that uses drugs to stop the growth of cancer cells, either by killing the cells or by stopping them from dividing. When chemotherapy is taken by mouth or injected into a vein or muscle, the drugs enter the bloodstream and can reach cancer cells throughout the body (systemic chemotherapy).
See Drugs Approved for Multiple Myeloma and Other Plasma Cell Neoplasms.
Corticosteroids are steroids that have antitumor effects in multiple myeloma.
Targeted therapy is a type of treatment that uses drugs or other substances to identify and attack specific cancer cells. Several types of targeted therapy may be used to treat multiple myeloma and other plasma cell neoplasms. There are different types of targeted therapy:
See Drugs Approved for Multiple Myeloma and Other Plasma Cell Neoplasms.
High doses of chemotherapy are given to kill cancer cells. Healthy cells, including blood-forming cells, are also destroyed by the cancer treatment. Stem cell transplant is a treatment to replace the blood-forming cells. Stem cells (immature blood cells) are removed from the blood or bone marrow of the patient (autologous) or a donor (allogeneic) and are frozen and stored. After the patient completes chemotherapy, the stored stem cells are thawed and given back to the patient through an infusion. These reinfused stem cells grow into (and restore) the body's blood cells.
Immunotherapy is a treatment that uses the patient's immune system to fight cancer. Substances made by the body or made in a laboratory are used to boost, direct, or restore the body's natural defenses against cancer. This cancer treatment is a type of biologic therapy.
See Drugs Approved for Multiple Myeloma and Other Plasma Cell Neoplasms.
Radiation therapy is a cancer treatment that uses high-energy x-rays or other types of radiation to kill cancer cells or keep them from growing. External radiation therapy uses a machine outside the body to send radiation toward the area of the body with cancer.
Surgery to remove the tumor may be done. After the doctor removes all the cancer that can be seen at the time of the surgery, some patients may be given radiation therapy after surgery to kill any cancer cells that are left. Treatment given after the surgery, to lower the risk that the cancer will come back, is called adjuvant therapy.
Watchful waiting is closely monitoring a patient’s condition without giving any treatment until signs or symptoms appear or change.
This summary section describes treatments that are being studied in clinical trials. It may not mention every new treatment being studied. Information about clinical trials is available from the NCI website.
Clinical trials are studying different combinations of immunotherapy, chemotherapy, steroid therapy, and drugs. New treatment regimens using selinexor are also being studied.
For information about side effects caused by treatment for cancer, visit our Side Effects page.
This therapy controls problems or side effects caused by the disease or its treatment, and improves quality of life. Supportive care is given to treat problems caused by multiple myeloma and other plasma cell neoplasms.
Supportive care may include the following:
For some patients, taking part in a clinical trial may be the best treatment choice. Clinical trials are part of the cancer research process. Clinical trials are done to find out if new cancer treatments are safe and effective or better than the standard treatment.
Many of today's standard treatments for cancer are based on earlier clinical trials. Patients who take part in a clinical trial may receive the standard treatment or be among the first to receive a new treatment.
Patients who take part in clinical trials also help improve the way cancer will be treated in the future. Even when clinical trials do not lead to effective new treatments, they often answer important questions and help move research forward.
Some clinical trials only include patients who have not yet received treatment. Other trials test treatments for patients whose cancer has not gotten better. There are also clinical trials that test new ways to stop cancer from recurring (coming back) or reduce the side effects of cancer treatment.
Clinical trials are taking place in many parts of the country. Information about clinical trials supported by NCI can be found on NCI’s clinical trials search webpage. Clinical trials supported by other organizations can be found on the ClinicalTrials.gov website.
As you go through treatment, you will have follow-up tests or check-ups. Some tests that were done to diagnose or stage the cancer may be repeated to see how well the treatment is working. Decisions about whether to continue, change, or stop treatment may be based on the results of these tests.
Some of the tests will continue to be done from time to time after treatment has ended. The results of these tests can show if your condition has changed or if the cancer has recurred (come back).
For information about the treatments listed below, see the Treatment Option Overview section.
Treatment of monoclonal gammopathy of undetermined significance (MGUS) is usually watchful waiting. Regular blood tests to check the level of M protein in the blood and physical exams to check for signs or symptoms of cancer will be done.
Use our clinical trial search to find NCI-supported cancer clinical trials that are accepting patients. You can search for trials based on the type of cancer, the age of the patient, and where the trials are being done. General information about clinical trials is also available.
For information about the treatments listed below, see the Treatment Option Overview section.
Treatment of isolated plasmacytoma of bone is usually radiation therapy to the bone lesion.
Use our clinical trial search to find NCI-supported cancer clinical trials that are accepting patients. You can search for trials based on the type of cancer, the age of the patient, and where the trials are being done. General information about clinical trials is also available.
For information about the treatments listed below, see the Treatment Option Overview section.
Treatment of extramedullary plasmacytoma may include the following:
Use our clinical trial search to find NCI-supported cancer clinical trials that are accepting patients. You can search for trials based on the type of cancer, the age of the patient, and where the trials are being done. General information about clinical trials is also available.
For information about the treatments listed below, see the Treatment Option Overview section.
Patients without signs or symptoms may not need treatment. These patients can have watchful waiting until signs or symptoms appear.
When signs or symptoms appear, there are two categories for patients receiving treatment:
Patients younger than 65 years are usually considered younger and fit. Patients older than 75 years are usually not eligible for a stem cell transplant. For patients between the ages of 65 and 75 years, fitness is determined by their overall health and other factors.
The treatment of multiple myeloma is usually done in phases:
Use our clinical trial search to find NCI-supported cancer clinical trials that are accepting patients. You can search for trials based on the type of cancer, the age of the patient, and where the trials are being done. General information about clinical trials is also available.
For information about the treatments listed below, see the Treatment Option Overview section.
Treatment of relapsed or refractory multiple myeloma may include the following:
Drugs used may include the following:
Use our clinical trial search to find NCI-supported cancer clinical trials that are accepting patients. You can search for trials based on the type of cancer, the age of the patient, and where the trials are being done. General information about clinical trials is also available.
For more information from the National Cancer Institute about multiple myeloma and other plasma cell neoplasms, see the following:
For general cancer information and other resources from the National Cancer Institute, visit:
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PDQ® Adult Treatment Editorial Board. PDQ Plasma Cell Neoplasms (Including Multiple Myeloma) Treatment. Bethesda, MD: National Cancer Institute. Updated <MM/DD/YYYY>. Available at: https://www.cancer.gov/types/myeloma/patient/myeloma-treatment-pdq. Accessed <MM/DD/YYYY>. [PMID: 26389437]
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