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2018 ; 2
(14
): 1738-1749
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English Wikipedia
CLT030, a leukemic stem cell-targeting CLL1 antibody-drug conjugate for treatment
of acute myeloid leukemia
#MMPMID30037800
Jiang YP
; Liu BY
; Zheng Q
; Panuganti S
; Chen R
; Zhu J
; Mishra M
; Huang J
; Dao-Pick T
; Roy S
; Zhao X
; Lin J
; Banik G
; Hsi ED
; Mandalam R
; Junutula JR
Blood Adv
2018[Jul]; 2
(14
): 1738-1749
PMID30037800
show ga
The current standard of care for acute myeloid leukemia (AML) is largely
ineffective with very high relapse rates and low survival rates, mostly due to
the inability to eliminate a rare population of leukemic stem cells (LSCs) that
initiate tumor growth and are resistant to standard chemotherapy. RNA-sequencing
analysis on isolated LSCs confirmed C-type lectin domain family 12 member A
(CLL1, also known as CLEC12A) to be highly expressed on LSCs but not on normal
hematopoietic stem cells (HSCs) or other healthy organ tissues. Expression of
CLL1 was consistent across different types of AML. We developed CLT030
(CLL1-ADC), an antibody-drug conjugate (ADC) based on a humanized anti-CLL1
antibody with 2 engineered cysteine residues linked covalently via a cleavable
linker to a highly potent DNA-binding payload, thus resulting in a site-specific
and homogenous ADC product. The ADC is designed to be stable in the bloodstream
and to release its DNA-binding payload only after the ADC binds to
CLL1-expressing tumor cells, is internalized, and the linker is cleaved in the
lysosomal compartment. CLL1-ADC inhibits in vitro LSC colony formation and
demonstrates robust in vivo efficacy in AML cell tumor models and tumor growth
inhibition in the AML patient-derived xenograft model. CLL1-ADC demonstrated a
reduced effect on differentiation of healthy normal human CD34(+) cells to
various lineages as observed in an in vitro colony formation assay and in an in
vivo xenotransplantation model as compared with CD33-ADC. These results
demonstrate that CLL1-ADC could be an effective ADC therapeutic for the treatment
of AML.