<prompt> Beta-2 microglobulin is a marker for?Multiple MyelomaMycosis fungoidesB-Cell lymphomaMantle cell lymphoma  <response>: Ans. is a i.e., Multiple myeloma Serum b2 microglobulin is increased in multiple myeloma and is the most important prognostic factor and can substitute for staging. b2 Microglobulin level:a .004gL - Median survival of 43 months.b .004 gL - Median survival of only 12 months. 