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Prepublished online as a Blood First Edition Paper on February 6, 2003; DOI 10.1182/blood-2002-06-1925.

Submitted July 11, 2002
Accepted January 23, 2003
Idiotype vaccination in multiple myeloma induced a reduction of circulating clonal tumor B cells
Thomas Rasmussen, Lotta Hansson, Anders Osterborg, Hans Erik Johnsen, and Hakan Mellstedt*
Herlev Hospital, University of Copenhagen, Herlev, Denmark
Department of Oncology (Radiumhemmet) and Hematology, Karolinska Hospital, Stockholm, Sweden
* Corresponding author; email: hakan.mellstedt{at}ks.se.
Myeloma cells express the idiotype (Id)-specific antigen that may be targeted by idiotype vaccination. Six stage I IgG myeloma patients were immunized with the autologous purified M-component together with the ajuvant cytokines IL-12 alone or in combination with GM-CSF. The effect of Id vaccination on circulating clonal tumor B cells was monitored by a real-time allele-specific oligonucleotides PCR method. No other treatment was given. Blood tumor mass reduction was observed in 4/6 patients, with one patient achieving a complete molecular remission in blood. In 3 of these 4 patients an idiotype specific T cell response was induced. In the remaining two patients with an unchanged level of blood tumor cells, one patient mounted a T cell response while the other did not. No significant change in the serum M-comp. conc. was noted. Id vaccination may target clonal B cells suggesting that this strategy might be complementary to achieve tumor control. The clinical significance of these findings remains to be established.

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