Rintodestrant (G1T48) is an orally bioavailable selective estrogen receptor degrader (SERD) discovered in Greg Thatcher's lab at UIC[1] and developed by G1 Therapeutics for the treatment of estrogen receptor-positive (ER+) breast cancer.[2] Structurally inspired by the 6-OH-benzothiophene scaffold used in arzoxifene and raloxifene, rintodestrant selectively binds to the estrogen receptor and inhibits ER signaling, demonstrating efficacy in endocrine-resistant tumors.[3]

Rintodestrant
Clinical data
Other namesG1T48
Identifiers
  • (E)-3-[4-[2-(4-fluoro-2,6-dimethyl-benzoyl)-6-hydroxy-benzothiophen-3-yl]oxyphenyl]prop-2-enoic acid
CAS Number
PubChem CID
ChemSpider
UNII
KEGG
ChEMBL
Chemical and physical data
FormulaC26H19FO5S
Molar mass462.49 g·mol−1
3D model (JSmol)
  • CC1=CC(=CC(=C1C(=O)C2=C(C3=C(S2)C=C(C=C3)O)OC4=CC=C(C=C4)/C=C/C(=O)O)C)F
  • InChI=InChI=1S/C26H19FO5S/c1-14-11-17(27)12-15(2)23(14)24(31)26-25(20-9-6-18(28)13-21(20)33-26)32-19-7-3-16(4-8-19)5-10-22(29)30/h3-13,28H,1-2H3,(H,29,30)/b10-5+
  • Key:KOAITBOFZOEDOC-BJMVGYQFSA-N

A phase I clinical trial evaluated rintodestrant as monotherapy and in combination with the CDK4/6 inhibitor palbociclib in patients with ER+/HER2- advanced breast cancer.[4]

References

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  1. Xiong R, Zhao J, Gutgesell LM, Wang Y, Lee S, Karumudi B, et al. (February 2017). "Novel Selective Estrogen Receptor Downregulators (SERDs) Developed against Treatment-Resistant Breast Cancer". Journal of Medicinal Chemistry. 60 (4): 1325–1342. doi:10.1021/acs.jmedchem.6b01355. PMC 5786431. PMID 28117994.
  2. Andreano KJ, Wardell SE, Baker JG, Desautels TK, Baldi R, Chao CA, et al. (April 2020). "G1T48, an oral selective estrogen receptor degrader, and the CDK4/6 inhibitor lerociclib inhibit tumor growth in animal models of endocrine-resistant breast cancer". Breast Cancer Research and Treatment. 180 (3): 635–646. doi:10.1007/s10549-020-05575-9. PMC 7103015. PMID 32130619.
  3. Gheysen M, Punie K, Wildiers H, Neven P (November 2024). "Oral SERDs changing the scenery in hormone receptor positive breast cancer, a comprehensive review". Cancer Treatment Reviews. 130 102825. doi:10.1016/j.ctrv.2024.102825. PMID 39293125.
  4. Clinical trial number NCT03455270 for "G1T48, an Oral SERD, Alone and in Combination With Palbociclib in ER-Positive, HER2-Negative Advanced Breast Cancer" at ClinicalTrials.gov