Multiple Myeloma

Multiple Myeloma is a type of bone marrow cancer characterised by abnormal expansion of malignant plasma cells in the bone marrow. It is the second most common type of blood cancer and afflicts more than 100 patients in Singapore a year. It has a rising incidence in Asia, the reason for which is still elusive. These tumours 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:​

• Red blood cells that carry oxygen and other substances to all tissues of the body
• White blood cells that fight infection and disease
• Platelets that form blood clots to help prevent bleeding

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.

In time, Myeloma cells collect in the bone marrow. They may damage the solid part of the bone. When Myeloma cells collect in several of your bones, the disease is called "Multiple Myeloma". This disease may also harm other tissues and organs, such as the kidneys.

Myeloma cells make antibodies called "M proteins". These proteins can collect in the blood, urine and organs.

Eventually, Myeloma causes anaemia, lytic bone lesions which may cause bone pain or fractures, renal impairment and hypercalcaemia.

There is currently no way to prevent Multiple Myeloma.

The symptoms are as follows:

• Bone Pain - Mostly in the back and the rib cage
• Anaemia - This can cause fatigue, dizziness and shortness of breath
• Hypercalcaemia - High levels of calcium in the blood may result in muscle weakness, increased thirst, nausea, loss of appetite, constipation as well as mental confusion
• Kidney Problems - Damage to the kidneys will impair the body's ability to remove excess salt, fluid and waste, resulting in the swelling of the lower limbs and weakness
• Recurrent infections and fevers

Consult your doctor if you experience these symptoms.

If you have a symptom that suggests Multiple Myeloma, your doctor must find out whether it is due to cancer or some other cause. Your doctor may ask about your personal and family medical history. You may also have one or more of the following tests.

Your doctor checks general signs of health, including checking for signs of disease, such as lumps or anything else that seems unusual. A history of the patient's health habits and past illnesses and treatments will also be taken.

Your doctor may order blood tests. The lab may check the level of many different proteins, including M protein and other immunoglobulins (antibodies), albumin, and beta-2-microglublin as Multiple Myeloma causes high levels of proteins in the blood. The lab may also do a complete blood count to check the number of white blood cells, red blood cells, and platelets as Myeloma may also cause anaemia and low levels of white blood cells and platelets. The lab may also check for high calcium levels or perform creatinine tests.

The lab may test for Bence Jones protein, a type of M protein, in urine. The lab measures the amount of Bence Jones protein in urine collected over a 24-hour period. If the lab finds a high level of Bence Jones protein in your urine sample, doctors may monitor your kidneys as Bence Jones protein can clog the kidneys and damage them.

This test is used to identify lytic lesions in the bones caused by Myeloma. In addition, this test can also detect any weakened bone areas or fractures that may require surgery.

A procedure that uses magnet, radio waves, and a computer to make a series of detailed pictures of areas inside the body. This procedure is called nuclear magnetic resonance imaging (MRI). An MRI may be used to find areas where the bone is damaged.

The Doctor may remove tissues to look for cancer cells. A biopsy is the only sure way to know whether Myeloma cells are in your bone marrow. Before the sample is taken, local anaesthesia is used to numb the area to help reduce the pain. The doctor then removes some bone marrow from your hip bone or another large bone. A pathologist uses a microscope to check the tissue for Myeloma cells. There are two ways the doctor can obtain bone marrow. Some patients may encounter both procedures during the same visit.

• Bone Marrow Aspiration - The doctor uses a thick, hollow needle to remove samples of bone marrow.
• Bone Marrow Biopsy - The doctor uses a thick, hollow needle to remove samples of bone marrow.

The following people may be at risk of Multiple Myeloma:

• Those over 55 years of age. The risk increases with age
• Men more susceptible to Multiple Myeloma
• Personal history of monoclonal gammopathy of undetermined significance (MGUS)
• Family history of Multiple Myeloma (the risk is higher if a close relative is a victim of the disease)

There are different treatments available for Multiple Myeloma depending on the stage of Multiple Myeloma. Factors other than the stage of cancer that might have an impact on your treatment decision include your age, your overall health, and your own preferences. The three main types of treatment include:

People with smoldering Myeloma may be able to put off having cancer treatment. By delaying treatment, you can avoid the side effects of treatment until you have symptoms.​

If you and your doctor agree that watchful waiting is a good idea, you may have regular checkups (such as every three months) and receive treatment if symptoms occur.​

Although watchful waiting avoids or delays the side effects of cancer treatment, this choice has risks. In some cases, it may reduce the chance to control Myeloma before it gets worse.​

You may decide against watchful waiting if you don’t want to live with untreated Myeloma. If you choose watchful waiting but grow concerned later, you should discuss your feelings with your doctor.​

Many different types of drugs are used to treat Myeloma. People often receive a combination of drugs, and many different combinations are used to treat Myeloma.​

Each type of drug kills cancer cells in a different way:​

• Chemotherapy: Chemotherapy kills fast-growing Myeloma cells, but the drug can also harm normal cells that divide rapidly
• Targeted therapy: Targeted therapies use drugs that block the growth of Myeloma cells. The targeted therapy blocks the action of an abnormal protein that stimulates the growth of Myeloma cells.
• Steroids: Some steroids have antitumor effects. It is thought that steroids can trigger the death of Myeloma cells. A steroid may be used alone or with other drugs to treat Myeloma.

You may receive the drugs orally or through a vein (IV). The treatment usually takes place in an outpatient part of the hospital, at the doctor’s office, or at home. Some people may need to stay in the hospital for treatment.

Many people with Multiple Myeloma may get a stem cell transplant. A stem cell transplant allows you to be treated with high doses of drugs. The high doses destroy both Myeloma cells and normal blood cells in the bone marrow. After you receive high-dose treatment, you receive healthy stem cells through a vein. New blood cells develop from the transplanted stem cells so they can replace the one that were destroyed by treatment.

Stem cell transplants may take place in the hospital or in the outpatient setting. Patients will be assessed individually for suitability for either setting. Some people with Myeloma have two or more transplants.

Stem cells may come from you or from someone who donates their stem cells to you:

• From you: An autologous stem cell transplant uses your own stem cells. Before you get the high-dose chemotherapy, your stem cells are removed. The cells may be treated to kill any Myeloma cells present. Your stem cells are frozen and stored. After you receive high-dose chemotherapy, the stored stem cells are thawed and returned to you.
• From a family member or another donor: An allogeneic stem cell transplant uses healthy stem cells from a donor. Your brother, sister, or parent may be the donor. Sometimes the stem cells come from a donor who isn’t related. Doctors use blood tests to be sure the donor’s cells match your cells. Allogeneic stem cell transplants are under study for the study for the treatment of Multiple Myeloma.

There are two ways to get stem cells for people with Myeloma. They usually come from the blood (peripheral blood stem cell transplant). They can also come from the bone marrow (bone marrow transplant).

After a stem cell transplant, you may stay in the hospital for several weeks or months. You will be at risk of infections because of the large doses of chemotherapy you received. In time, the transplanted cells will begin to produce healthy blood cells.