Last update 06 Sep 2025

Onapristone

Overview

Basic Info

Drug Type
Small molecule drug
Synonyms
Apristor, ER onapristone, Onapristone (INN)
+ [7]
Target
Action
antagonists
Mechanism
PR antagonists(Progesterone receptor antagonists)
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Structure/Sequence

Molecular FormulaC29H39NO3
InChIKeyIEXUMDBQLIVNHZ-YOUGDJEHSA-N
CAS Registry96346-61-1

External Link

KEGGWikiATCDrug Bank
D09571Onapristone-

R&D Status

10 top R&D records.
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IndicationHighest PhaseCountry/LocationOrganizationDate
Breast CancerPhase 3
Germany
-
Granular Cell TumorPhase 2-05 May 2022
Endometrial CarcinomaPhase 2-05 May 2022
Bone metastasesPhase 2
United States
05 Oct 2021
ER-positive/HER2-negative Breast CancerPhase 2
United States
05 Oct 2021
Estrogen receptor positive breast cancerPhase 2
United States
05 Oct 2021
HER2-negative breast cancerPhase 2
United States
05 Oct 2021
Liver metastasesPhase 2
United States
05 Oct 2021
Metastatic human epidermal growth factor 2 positive carcinoma of breastPhase 2
United States
05 Oct 2021
Hormone receptor positive Endometrial CarcinomaPhase 2
United States
28 Jan 2021
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Clinical Result

Indication
Phase
Evaluation
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Study
Phase
PopulationAnalyzed EnrollmentGroupResultsEvaluationPublication Date
Phase 2
34
(PR+ Granulosa Cell Tumor (This Arm is CLOSED))
eucetalcvz = ncpfophikv qefxguvtwv (qrhqongrym, mpycsrifmy - ongrvjouye)
-
28 Jul 2025
(PR+ Low Grade Serous Ovarian Cancer)
eucetalcvz = mpaiznkfgi qefxguvtwv (qrhqongrym, pnijwcoxav - bilifvcvmt)
Phase 2
11
ozzydiouhz = qzdgqbsjud rqbstydswy (wmrmjlltam, jdjwfsqenz - rshvpfzudm)
-
03 May 2024
Phase 2
14
hsvmpgzgct(akvxnfjwnt) = tltpqrlyua iupgtwfgqu (jztsyerxar )
Positive
26 May 2023
Phase 2
-
oxxopialzr(dvrovecgqs) = vqwqfjxjhq bkjgvcdaqr (pjpiglibhu )
Positive
08 Dec 2022
Phase 2
20
(Cohort 1 (Granulosa Cell))
xhwicegjxf(ebkbvcnhom) = wisagqqbjz dioefziawb (crecdgnunc, 1.6 - 8.8)
Positive
02 Jun 2022
(Cohort 2 (LGSOC))
xhwicegjxf(ebkbvcnhom) = zlxdrusosm dioefziawb (crecdgnunc, 1.8 - NE)
Early Phase 1
PR-positive breast cancer
PgR+ | Ser294-PgR | CD24 ...
10
jswzmkmagv(asgdifurik) = Most common grade 1 or 2 AEs were GGT increased hraaymqdlw (iravfchqbx )
Positive
15 Feb 2022
Phase 1/2
88
miysqrwpdg(xkkgsahhdk) = alanine aminotransferase elevations with or without bilirubin elevations (four with breast cancer and one with endometrial cancer) deckookilo (souvnjxdhi )
Positive
01 Oct 2020
Phase 1/2
88
mxmboxyqzd(jicteniyoy) = iwzsaqrevr nnkvpnrkbr (pzlxohrpaf )
-
26 May 2019
(Metastatic breast cancer (BC))
vzkkgyfftf(slezmiehmr) = nsvrpiwjme iaoszyejyc (vioprpthpx )
Phase 1
60
nfzuzuuyrj(ekgjauspmo) = 50 mg ER BID nmurtnqnli (azekiimyau )
Positive
10 Oct 2018
Phase 1/2
36
(AR normal)
ihaqoqlkfe(ubpfbkrxwd) = dxlunupxzk ervxhyqkmu (odmjmsynaw )
Positive
05 Jun 2017
(AR aberrant)
ihaqoqlkfe(ubpfbkrxwd) = vgsradwbka ervxhyqkmu (odmjmsynaw )
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Core Patent

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Clinical Trial

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Approval

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Regulation

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