Clinical data
Trade names Ixempra
AHFS/Drugs.com Monograph
MedlinePlus a608042
License data
  • US: D (Evidence of risk)
Routes of
Intravenous infusion
ATC code L01DC04 (WHO)
Legal status
Legal status
Pharmacokinetic data
Bioavailability N/A
Protein binding 67 to 77%
Metabolism Extensive, hepatic, CYP3A4-mediated
Biological half-life 52 hours
Excretion Fecal (mostly) and renal
Synonyms Azaepothilone B
CAS Number 219989-84-1 N
PubChem (CID) 6445540
DrugBank DB04845 YesY
ChemSpider 20145579 YesY
UNII K27005NP0A YesY
KEGG D04645 YesY
ECHA InfoCard 100.158.736
Chemical and physical data
Formula C27H42N2O5S
Molar mass 506.698 g/mol
3D model (Jmol) Interactive image
 NYesY (what is this?)  (verify)

Ixabepilone (INN; also known as azaepothilone B, codenamed BMS-247550) is an epothilone B analog[1] developed by Bristol-Myers Squibb as a chemotherapeutic medication for cancer.[2]

It is produced by Sorangium cellulosum.[3]


It acts to stabilize microtubules.[4][5][6] It is highly potent agent, capable of damaging cancer cells in very low concentrations, and retains activity in cases where tumor cells are insensitive to paclitaxel.[7]


On October 16, 2007, the U.S. Food and Drug Administration approved ixabepilone for the treatment of aggressive metastatic or locally advanced breast cancer no longer responding to currently available chemotherapies.[8] In November 2008, the EMEA has refused a marketing authorisation for Ixabepilone.[9]

Ixabepilone is administered through injection, and is marketed under the trade name Ixempra.

Clinical uses

Ixabepilone, in combination with capecitabine, has demonstrated effectiveness in the treatment of metastatic or locally advanced breast cancer in patients after failure of an anthracycline and a taxane.[10]

It has been investigated for use in treatment of non-Hodgkin's lymphoma.[11] In pancreatic cancer phase two trial it showed some promising results (used alone). Combination therapy trials are ongoing.[7]


  1. Goodin S (May 2008). "Novel cytotoxic agents: epothilones". Am J Health Syst Pharm. 65 (10 Suppl 3): S10–5. doi:10.2146/ajhp080089. PMID 18463327.
  2. http://www.cancer.org/Treatment/TreatmentsandSideEffects/GuidetoCancerDrugs/Ixabepilone
  3. Lee FY, Borzilleri R, Fairchild CR, et al. (December 2008). "Preclinical discovery of ixabepilone, a highly active antineoplastic agent". Cancer Chemother. Pharmacol. 63 (1): 157–66. doi:10.1007/s00280-008-0724-8. PMID 18347795.
  4. Lopus, M; Smiyun, G; Miller, H; Oroudjev, E; Wilson, L; Jordan, MA (2015). "Mechanism of action of ixabepilone and its interactions with the βIII-tubulin isotype.". Cancer Chemother Pharmacol. 76: 1013–24. doi:10.1007/s00280-015-2863-z. PMID 26416565.
  5. Denduluri N, Swain SM (March 2008). "Ixabepilone for the treatment of solid tumors: a review of clinical data". Expert Opin Investig Drugs. 17 (3): 423–35. doi:10.1517/13543784.17.3.423. PMID 18321240.
  6. Goodin S (November 2008). "Ixabepilone: a novel microtubule-stabilizing agent for the treatment of metastatic breast cancer". Am J Health Syst Pharm. 65 (21): 2017–26. doi:10.2146/ajhp070628. PMID 18945860.
  7. 1 2 M. Vulfovich; Rocha-Lima, C; et al. (2008). "Novel advances in pancreatic cancer treatment". Expert Rev Anticancer Ther. 8 (6): 993–1002. doi:10.1586/14737140.8.6.993. PMID 18533808.
  8. Medical News Today
  9. London, 20 November 2008 Doc. Ref. EMEA/602569/2008
  10. Thomas ES, Gomez HL, Li RK, et al. (November 2007). "Ixabepilone plus capecitabine for metastatic breast cancer progressing after anthracycline and taxane treatment". J. Clin. Oncol. 25 (33): 5210–7. doi:10.1200/JCO.2007.12.6557. PMID 17968020.
  11. Aghajanian C, Burris HA, Jones S, et al. (March 2007). "Phase I study of the novel epothilone analog ixabepilone (BMS-247550) in patients with advanced solid tumors and lymphomas". J. Clin. Oncol. 25 (9): 1082–8. doi:10.1200/JCO.2006.08.7304. PMID 17261851.
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