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Colony stimulating factor 1 receptor (CSF1R, c-Fms, CD115) is a tyrosine kinase transmembrane receptor for a cytokine called colony stimulating factor 1 (CSF-1). CSF-1R and its ligands, CSF-1 and interleukin 34 (IL-34), regulate the function and survival of tumor-associated macrophages, which are involved in tumorigenesis and in the suppression of antitumor immunity.

In solid tumors, targeting CSF-1R via either small molecules or antibodies has shown interesting results in vitro but limited antitumor activity in vivo. Blocking CSF-1/CSF-1R signaling represents a promising immunotherapy approach and several new potential combination therapies for future clinical testing.

PLX-3397 (pexidartinib) is an oral, potent, multi-target receptor tyrosine kinase inhibitor of CSF-1R, Kit, and Flt3 and is the most advanced selective CSF-1R inhibitor under clinical development. ABT-869 (linifanib) is an oral inhibitor of CSF-1R tyrosine kinase conducted a phase II trial in which ABT869 was administered to patients with hepatocellular carcinoma. BLZ-945 is another orally active, bioavailable, potent, and selective inhibitor of CSF-1R, which is currently being assessed in a first-in-man phase I/II study as a single agent or in combination with PDR-001 (anti-PD-1 antibody) in several advanced solid tumors. Besides, multiple anti-CSF-1R monoclonal antibodies have also entered clinical trials, including FPA-008 (cabiralizumab), RG-7155 (RO5509554), IMC-CS4 (LY3022855) and AMG-820.

The development of new CSF-1R/CSF-1 axis inhibitors represents an attractive method for managing patients with metastatic solid tumors refractory to the standards of care or with diffuse/relapsed TGCT. Recent clinical trials testing CSF-1R inhibitors as monotherapies have shown encouraging results in the management of PVNS but disappointing outcomes for the treatment of solid tumors.

 

References:

1. Peyraud F, et al. Curr Oncol Rep. 2017 Sep 5;19(11):70.

2. Pyonteck SM, et al. Nat Med. 2013 Oct;19(10):1264-72.

3. Kogan M, et al. Anticancer Res. 2012 Mar;32(3):893-9.

4. Albert DH, et al. Mol Cancer Ther. 2006 Apr;5(4):995-1006.

 

Cat. No. Product Name Information
PC-63412

JNJ-28312141 hydrochloride

JNJ-28312141 is a potent, orally active CSF-1 receptor (CSF-1R) kinase inhibitor with IC50 of 0.69 nM.
PC-63411

JNJ-28312141

JNJ-28312141 is a potent, orally active CSF-1 receptor (CSF-1R) kinase inhibitor with IC50 of 0.69 nM.
PC-43376

c-FMS-IN-8

c-FMS-IN-8 is a potent, selective c-FMS kinase inhibitor with IC50 of 0.8 nM, shows activity in collagen-induced model of arthritis in mice..
PC-62826

CSF1R-IN-22

CSF1R-IN-22 is a potent, cellular active and orally bioavailable CSF1R inhibitor with IC50 of 0.5 nM, displays 120-fold selectivity over c-Kit.
PC-42568

Ki20227

A potent, selective, orally active c-Fms inhibitor with IC50 of 2 nM.
PC-42737

GW2580

A potent, selective c-Fms (CSF1R) inhibitor that completely inhibits human cFMS kinase in vitro at 60 nM.

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