Which is a malignant disorder of mature antibody-secreting b lymphocytes or plasma cells?

The malignant disorder of mature antibody-secreting b lymphocytes or plasma cells is called the Multiple Myeloma. 
Multiple Myeloma is a cancer of plasma cells in the bone marrow.  The condition features abnormal proliferation of plasma cells in the bone marrow, destructive bone lesions, and the production of abnormal proteins, specifically antibodies. Its symptoms may include, fatigue, bone pain, bone fracture, kidney failure among other symptoms.  

That is true tge cactus as a structural adaptation to its envirinment has it leaves reduced to spines. but this doesnt mean it cant produce food it produces food because of the presence of chlorophyll in its stem