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Abstract
Abstract
High dose melphalan (HDM) followed by reinfusion of autologous blood stem cells (ASCT) has been applied in AL amyloidosis. Vincristine, doxorubicin, and dexamethasone (VAD) rapidly decrease light chain production in multiple myeloma.
In a Phase I/II study of VAD followed by HDM and ASCT in AL amyloidosis, toxicity, feasibility, and response to this regimen were evaluated. Over a 5-year period 38 patients with AL amyloidosis were seen of which 12 out of 18 eligible patients participated in the study.
VAD induced a distinct clonal response in 50% (6/12) of the patients, but without clinical improvement. In 11 patients HDM and ASCT was applied. Six months after ASCT 78% (7/9) of the surviving patients showed partial clonal response and none responded completely. Clinical condition evidently improved in 67% (6/9) of survivors, whereby clinical response, clinical response, performance score, and SAP scintigraphs were concordant. Therefore a complete clonal response is not a prerequisite for clinical improvement.
With median follow-up after ASCT of 25 months, 75% of the study group patients were alive. Mortality was strongly depending on the number of organs involved. Patients treated with HDM and ASCT had better survival than those not eligible (P < 0.0005).