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Abnormal free light chain production has also been reported to be prognostic of a worse outcome in multiple myeloma [36] [37] [38] and chronic lymphocytic leukaemia. [39] An abnormal light-chain ratio has been defined as a kappa to lambda chain ratio of less than 0.26 or more than 1.65. [32]
Light chain multiple myeloma is diagnosed in patients who have: a) the criteria for diagnosis of multiple myeloma except having a serum free light chain ratio outside the normal range of 0.26 to 1.65 without evidence of an intact immunoglobulin or free heavy chain; or b) an extreme free light chain ratio, i.e. outside the range of 0.02 to 100 ...
MDX-1097 (formerly called IST-1097, now called KappaMab) is a monoclonal antibody therapy that in 2023 has been assessed in a Phase IIb clinical trial in conjunction with lenalidomide and dexamethasone as a treatment for multiple myeloma, a type of white blood cell cancer.
Multiple myeloma (MM), also known as plasma cell myeloma and simply myeloma, is a cancer of plasma cells, a type of white blood cell that normally produces antibodies. [6] Often, no symptoms are noticed initially. [10] As it progresses, bone pain, anemia, renal insufficiency, and infections may occur. [10]
Once set, light chain class remains fixed for the life of the B lymphocyte. In a healthy individual, the total kappa-to-lambda ratio is roughly 2:1 in serum (measuring intact whole antibodies) or 1:1.5 if measuring free light chains, with a highly divergent ratio indicative of neoplasm. The free light chain ratio ranges from 0.26 to 1.65. [1]
Bence Jones proteins are present in 2/3 of multiple myeloma cases. [3] The proteins are immunoglobulin light chains (paraproteins) and are produced by neoplastic plasma cells. They can be kappa (most of the time) or lambda. [3] The light chains can be immunoglobulin fragments or single homogeneous immunoglobulins.
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