Gamma heavy chain disease: rapid, sustained response to cyclophosphamide
and prednisone
RM Lyons, H Chaplin, TW Tillack and PW Majerus
A patient, CAL, with gamma heavy chain disease is presented who has had a
complete remission lasting over 2 yr with combination chemotherapy
consisting of pulsatile cyclophosphamide and prednisone. The patient
exhibited many features of an atuoimmune process including a vasculitis,
low serum complement levels, a positive antiglobulin (Coombs) test,
Raynaud's phenomenon, and keratoconjunctivitis sicca. The CAL paraprotein
was found to have several previously undescribed characteristics. It
reacted with antisera to Fd, Fab, and Fab', suggesting that most of the Fd
portion of the molecule was intace. CAL protein consists of two polypeptide
chains of molecular weight 49,000 covalently linked to form a dimer of
95,000 molecular weight. The covalent linkage suggests that the hinge
region of this gamma heavy chain is intact.
Volume 46,
Issue 1,
pp. 1-9,
07/01/1975
Copyright © 1975 by The American Society of Hematology