Bortezomib in Late Antibody-mediated Kidney Transplant Rejection
Status:
Completed
Trial end date:
2017-02-28
Target enrollment:
Participant gender:
Summary
Late antibody-mediated rejection (AMR) after kidney transplantation is defined as a separate
rejection entity. So far, no appropriate treatment has been established for this rejection
type. One promising strategy could be the targeting of alloantibody-producing plasma cells.
There is now accumulating evidence that the proteasome inhibitor Bortezomib may substantially
affect the function and integrity of non-malignant alloantibody-secreting plasma cells. The
impact of this compound on the course of late AMR , however, has not yet been systematically
investigated. In the planned phase IIa study we will examine the effect of Bortezomib on late
AMR after kidney transplantation. We plan an initial cross-sectional HLA antibody screening
of 1000 kidney transplant recipients to identify patients with detectable donor-specific
antibodies (DSA). DSA-positive recipients will be subjected to kidney allograft biopsy to
detect morphological features consistent with AMR. Forty-four patients with late AMR will be
included in a randomized double-blind placebo-controlled parallel-group intervention trial.
Patients in the active group will receive two cycles of Bortezomib (4 x 1.3 mg/m2). The
primary end point will be the course of estimated GFR over 24 months after randomization.
Secondary endpoints are the course of DSA levels and protein excretion, measured GFR after 24
months, transplant and patient survival, and the development of acute and chronic
morphological lesions in 24-month protocol biopsies. Our study will clarify the impact of an
innovative anti-humoral strategy on the deleterious effects of late AMR processes.