Multiple myeloma (MM, also known as Kahler's disease) is a blood
cancer whereby the plasma cells in the bone marrow start proliferating
malignantly. MM cannot be cured and is most common among older people.
Various treatments exist to temporarily suppress the disease, but the
challenge is determining to which treatment the patient will respond
20 to 40% of the patients with multiple myeloma - a type of leukemia - have a defect in the ribosome, the protein factory of the cell. These patients have a poorer prognosis than patients with intact ribosomes. At the same time, they respond better to a drug that already exists. These are the findings of a study by the Laboratory for Disease Mechanisms in Cancer at KU Leuven (University of Leuven), Belgium.
Doctoral student Isabel Hofman (KU Leuven) discovered defects in the ribosome of MM patients. "The ribosome is the protein factory of a cell. In MM patients, one part of the ribosome is produced less in 20 to 40% of the patients, depending on how aggressive the cancer is. We suspect that their cells are still producing protein, but that the balance is somewhat disrupted. In any case, we found that these people have a poorer prognosis than MM patients with an intact ribosome," explains Professor Kim De Keersmaecker, head of the KU Leuven Laboratory for Disease Mechanisms in Cancer.
The notion that cancer is related to ribosome defects is a relatively new concept in science. "A few years ago, we discovered defects in the ribosome of patients with acute lymphatic leukaemia. Now we know that the same applies to MM. In all likelihood, this will also hold true for other types of cancer. Our next research goal is finding out for which cancers this is the case, how the link between ribosome and proteasome works, and what the possibilities are of drugs that target the ribosome itself."