What is myeloma?

Normally, new plasma cells are produced to replace old, worn-out cells in an orderly, controlled way. However, in myeloma the process gets out of control and large numbers of abnormal plasma cells (myeloma cells) are produced. These fill up the bone marrow| and interfere with the production of normal white cells, red cells and platelets.

The myeloma cells usually produce a large amount of a single type of abnormal antibody. This is known as a paraprotein or M protein. It can’t fight infection effectively and often reduces the production of normal antibodies. Myeloma cells can spread throughout the bone marrow| and into the bone, causing thinning of the bone, pain and sometimes fractures.

Types of myeloma

There are different types of myeloma, which are classified depending on the type of immunoglobulin (Ig) produced by the myeloma cells. The most common type of myeloma is IgG, where the heavy chain of the immunoglobulin is G. Around six out of ten (60%) people with myeloma have IgG and three out of ten (30%) have IgA. IgD, IgE and IgM are rarer types. The type of myeloma you have doesn’t usually affect the treatment you’re offered but it can influence how the disease will affect you.

Around 1 in 3 people have a type of myeloma that produces light chains only. This is called light chain or Bence Jones myeloma. A rare type of myeloma called non-secretory myeloma produces little or no immunoglobulin.

Myeloma is one type of disorder of the plasma cells. Some other conditions of the plasma cells can develop into myeloma but may not necessarily do so. The two most common of these are monoclonal gammopathy of uncertain significance (MGUS)| and smouldering myeloma, which is also known as indolent or asymptomatic myeloma.

If you’re diagnosed with either of these conditions, you’ll be monitored with blood tests|, but may not need to have any treatment| unless the condition progresses.

Sometimes abnormal plasma cells are found in a bone in only one area of the body. This condition is known as a solitary plasmacytoma. It’s treated with radiotherapy|. Some people with solitary plasmacytoma may go on to develop multiple myeloma, so you’ll be regularly monitored with blood tests.