Clinical data
AHFS/ International Drug Names
Routes of
s.c. injection only, premedication with H1 and H2 antihistamines and beta-receptor agonists for bronchodilation
ATC code L03AA12 (WHO)
Pharmacokinetic data
Biological half-life 2.5 h
Excretion renal: 90%
CAS Number 163545-26-4 N
ChemSpider none
KEGG D02937 YesY
 NYesY (what is this?)  (verify)

Ancestim is a recombinant methionyl human stem cell factor, branded by Amgen as StemGen. It was developed by Amgen and sold to Biovitrium, now Swedish Orphan Biovitrum, in December, 2008.[1]

It is a 166 amino acid protein produced by E. coli bacteria into which a gene has been inserted for soluble human stem cell factor.[2] It has a monomeric molecular weight of approximately 18,500 daltons and normally exists as a noncovalently associated dimer. The protein has an amino acid sequence that is identical to the natural sequence predicted from human DNA sequence analysis, except for the addition of an N-terminal methionine retained after expression in E. coli. Because Ancestim is produced in E. coli, it is nonglycosylated. Ancestim is supplied as a sterile, white, preservative-free, lyophilised powder for reconstitution and administration as a subcutaneous (SC) injection and is indicated for use in combination with filgrastim for mobilizing peripheral hematopoietic stem cells for later transplanation in certain cancer patients.[3]


  1. Amgen press office. Biovitrum Closes Product Acquisition Deal with Amgen Archived July 3, 2012, at the Wayback Machine.
  2. da Silva MG, Pimentel P, Carvalhais A, et al. (2004). "Ancestim (recombinant human stem cell factor, SCF) in association with filgrastim does not enhance chemotherapy and/or growth factor-induced peripheral blood progenitor cell (PBPC) mobilization in patients with a prior insufficient PBPC collection". Bone Marrow Transplant. 34 (8): 683–91. doi:10.1038/sj.bmt.1704602. PMID 15322567.
  3. Sobi's StemGen page]

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