<prompt> True regarding multiple myeloma are all exceptPlasmacytosis less than 10increased IgGANA antibodyIncrased M spikes  <response>: In multiple myeloma , marrow plasmacytosis will be more than 10.On serum electrophoresis ,the paraprotein usually appears as a single narrow homogenous M-band component. Most frequent paraprotein is IgG seen in about 50 cases of myeloma. Reactive plasmacytosis can occur in disorders such as aplastic anemia, rheumatoid ahritis ,SLE,cirrhosis of liver,metastatic cancer chronic inflammation infection such as tuberculosis .So ANA antibody may become positive .Reference :Harsh mohan textbook of pathology 6th edition pg no 382. 