Bence jones proteins are -
About two-third cases of multiple myeloma excrete Bence Jones peotein i.e, light chain Ig G in the urine. Bence Jones proteins are paraproteins or abnormal immunoglobulins or their pas circulating in plasma & excreted in urine.Reference :Harsh mohan textbook of pathology sixth edition pg no 383.
Heavy chain IgG
Present in bone marrow
Seen in lymphoma
Light chain IgG
Haematology