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2016 ; 55
(5
): 525-50
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Pharmacokinetics, Pharmacodynamics and Pharmacogenomics of Immunosuppressants in
Allogeneic Haematopoietic Cell Transplantation: Part I
#MMPMID26563168
McCune JS
; Bemer MJ
Clin Pharmacokinet
2016[May]; 55
(5
): 525-50
PMID26563168
show ga
Although immunosuppressive treatments and target concentration intervention (TCI)
have significantly contributed to the success of allogeneic haematopoietic cell
transplantation (alloHCT), there is currently no consensus on the best
immunosuppressive strategies. Compared with solid organ transplantation, alloHCT
is unique because of the potential for bidirectional reactions
(i.e. host-versus-graft and graft-versus-host). Postgraft immunosuppression
typically includes a calcineurin inhibitor (cyclosporine or tacrolimus) and a
short course of methotrexate after high-dose myeloablative conditioning, or a
calcineurin inhibitor and mycophenolate mofetil after reduced-intensity
conditioning. There are evolving roles for the antithymyocyte globulins (ATGs)
and sirolimus as postgraft immunosuppression. A review of the pharmacokinetics
and TCI of the main postgraft immunosuppressants is presented in this two-part
review. All immunosuppressants are characterized by large intra- and
interindividual pharmacokinetic variability and by narrow therapeutic indices. It
is essential to understand immunosuppressants' pharmacokinetic properties and how
to use them for individualized treatment incorporating TCI to improve outcomes.
TCI, which is mandatory for the calcineurin inhibitors and sirolimus, has become
an integral part of postgraft immunosuppression. TCI is usually based on trough
concentration monitoring, but other approaches include measurement of the area
under the concentration-time curve (AUC) over the dosing interval or limited
sampling schedules with maximum a posteriori Bayesian personalization approaches.
Interpretation of pharmacodynamic results is hindered by the prevalence of
studies enrolling only a small number of patients, variability in the allogeneic
graft source and variability in postgraft immunosuppression. Given the curative
potential of alloHCT, the pharmacodynamics of these immunosuppressants deserves
to be explored in depth. Development of sophisticated systems pharmacology models
and improved TCI tools are needed to accurately evaluate patients' exposure to
drugs in general and to immunosuppressants in particular. Sequential studies,
first without and then with TCI, should be conducted to validate the clinical
benefit of TCI in homogenous populations; randomized trials are not feasible,
because there are higher-priority research questions in alloHCT. In Part I of
this article, we review the alloHCT process to facilitate optimal design of
pharmacokinetic and pharmacodynamics studies. We also review the pharmacokinetics
and TCI of calcineurin inhibitors and methotrexate.