Clinical data
Synonyms 2-Methoxyestra-1,3,5(10)-triene-3,17β-diol
CAS Number
PubChem CID
ECHA InfoCard 100.164.606
Chemical and physical data
Formula C19H26O3
Molar mass 302.408 g/mol
3D model (JSmol)
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2-Methoxyestradiol (2-ME2) is a natural metabolite of estradiol. As an experimental drug candidate, it is being developed under the tradename of Panzem.[1] It prevents the formation of new blood vessels that tumors need in order to grow (angiogenesis), hence it is an angiogenesis inhibitor.[2]

It also acts as a vasodilator.

2-ME2 is derived from estradiol, although it binds poorly (2000-fold lower activational potency) to known estrogen receptors.[3] However, 2-ME2 retains activity as a high-affinity agonist of the GPER (GPR30).[4]

It induces apoptosis in some cancer cell lines.[5]

It has undergone Phase 1 clinical trials against breast cancer.

A phase II trial of 18 advanced ovarian cancer patients reported encouraging results in October 2007.[6]

Preclinical models also suggest that 2-ME2 could also be effective against inflammatory diseases such as rheumatoid arthritis. Several studies have been conducted showing 2-ME2 is a microtubule-inhibitor[7] and effective against prostate cancer in rodents.

As of 2015, all clinical development of 2-ME2 has been suspended or discontinued.[8]

See also


  1. EntreMed's Product Information Site Archived May 4, 2005, at the Wayback Machine.
  2. Pribluda VS, Gubish ER, Lavallee TM, Treston A, Swartz GM, Green SJ (2000). "2-Methoxyestradiol: an endogenous antiangiogenic and antiproliferative drug candidate". Cancer Metastasis Reviews. 19 (1-2): 173–9. doi:10.1023/a:1026543018478. PMID 11191057.
  3. Sibonga JD, Lotinun S, Evans GL, Pribluda VS, Green SJ, Turner RT (March 2003). "Dose-response effects of 2-methoxyestradiol on estrogen target tissues in the ovariectomized rat". Endocrinology. 144 (3): 785–92. doi:10.1210/en.2002-220632. PMID 12586754.
  4. Thekkumkara T, Snyder R, Karamyan VT (2016). "Competitive Binding Assay for the G-Protein-Coupled Receptor 30 (GPR30) or G-Protein-Coupled Estrogen Receptor (GPER)". Methods in Molecular Biology. 1366: 11–7. doi:10.1007/978-1-4939-3127-9_2. PMID 26585123.
  5. LaVallee TM, Zhan XH, Johnson MS, Herbstritt CJ, Swartz G, Williams MS, Hembrough WA, Green SJ, Pribluda VS (January 2003). "2-methoxyestradiol up-regulates death receptor 5 and induces apoptosis through activation of the extrinsic pathway". Cancer Research. 63 (2): 468–75. PMID 12543804.
  6. "EntreMed Presents Results for Panzem® NCD Phase 2 Ovarian Cancer Study". Archived from the original on July 17, 2012.
  7. Lakhani NJ, Sarkar MA, Venitz J, Figg WD (February 2003). "2-Methoxyestradiol, a promising anticancer agent". Pharmacotherapy. 23 (2): 165–72. doi:10.1592/phco. PMID 12587805.
  8. "2-Methoxyestradiol - CASI Pharmaceuticals". Adis Insight. Retrieved 2 March 2017.
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