Ans. Plasma cell diseases can be studied as a type of blood cancer that causes plasma cells to become cancerous/malignant and can lead to serious harm to the bones, kidneys, bone marrow, heart, and immune system, causing patients to become ill. Systemic light-chain (AL) amyloidosis, Multiple myeloma, and monoclonal immunoglobulin deposition disease are plasma cell diseases. Plasma cell diseases such as mouldering multiple myeloma and monoclonal gammopathy of undetermined significance (MGUS) are the ones where patients are not yet infected because they tend to have very little organ damage.