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2016 ; 5
(8
): e1208875
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Targeting CD73 in the tumor microenvironment with MEDI9447
#MMPMID27622077
Hay CM
; Sult E
; Huang Q
; Mulgrew K
; Fuhrmann SR
; McGlinchey KA
; Hammond SA
; Rothstein R
; Rios-Doria J
; Poon E
; Holoweckyj N
; Durham NM
; Leow CC
; Diedrich G
; Damschroder M
; Herbst R
; Hollingsworth RE
; Sachsenmeier KF
Oncoimmunology
2016[Aug]; 5
(8
): e1208875
PMID27622077
show ga
MEDI9447 is a human monoclonal antibody that is specific for the ectoenzyme CD73
and currently undergoing Phase I clinical trials. Here we show that MEDI9447 is a
potent inhibitor of CD73 ectonucleotidase activity, with wide ranging immune
regulatory consequences. MEDI9447 results in relief from adenosine monophosphate
(AMP)-mediated lymphocyte suppression in vitro and inhibition of mouse syngeneic
tumor growth in vivo. In contrast with other cancer immunotherapy agents such as
checkpoint inhibitors or T-cell agonists, MEDI9447 drives changes in both myeloid
and lymphoid infiltrating leukocyte populations within the tumor microenvironment
of mouse models. Changes include significant alterations in a number of tumor
micro-environmental subpopulations including increases in CD8(+) effector cells
and activated macrophages. Furthermore, these changes correlate directly with
responder and non-responder subpopulations within animal studies using syngeneic
tumors. Combination data showing additive activity between MEDI9447 and anti-PD-1
antibodies using human cells in vitro and mouse tumor models further demonstrate
the potential value of relieving adenosine-mediated immunosuppression. Based on
these data, a Phase I study to test the safety, tolerability, and clinical
activity of MEDI9447 in cancer patients was initiated (NCT02503774).