Last update 24 May 2025

H3B-6545

Overview

Basic Info

Drug Type
Small molecule drug
Synonyms
H3B 6545
Target
Action
antagonists
Mechanism
ERα antagonists(Estrogen receptor alpha antagonists)
Inactive Indication-
Originator Organization
Active Organization
Inactive Organization-
License Organization-
Drug Highest PhasePhase 1/2
First Approval Date-
Regulation-
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Structure/Sequence

Molecular FormulaC30H29F4N5O2
InChIKeyJPFTZIJTXCHJNE-HMOQVRKWSA-N
CAS Registry2052130-80-8

R&D Status

10 top R&D records.
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IndicationHighest PhaseCountry/LocationOrganizationDate
Estrogen receptor positive breast cancerPhase 2
United States
23 Aug 2017
Estrogen receptor positive breast cancerPhase 2
France
23 Aug 2017
Estrogen receptor positive breast cancerPhase 2
United Kingdom
23 Aug 2017
ER-positive/HER2-negative Breast CancerPhase 1
United States
01 Apr 2020
ER-positive/HER2-negative Breast CancerPhase 1
United Kingdom
01 Apr 2020
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Clinical Result

Indication
Phase
Evaluation
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Study
Phase
PopulationAnalyzed EnrollmentGroupResultsEvaluationPublication Date
Phase 1/2
151
(Phase 1: Dose Escalation: H3B-6545 100 mg)
fvdbopbtil = kxmtfyaqfn tuzwzgqijk (oviqvcroyl, tohzltpdir - xxnvnhrpsj)
-
25 Feb 2025
(Phase 1: Dose Escalation: H3B-6545 200 mg)
fvdbopbtil = ahkxspwscc tuzwzgqijk (oviqvcroyl, srduykmiyh - afkivjasmq)
Phase 1
ER-positive/HER2-negative Breast Cancer
Second line
HER2 Negative | ER Positive
31
czrkgfznru(moywcufpqh) = hbuwrybtvk lhfbvsybta (bwiibuuqbs, 9.0–43.6)
Positive
24 May 2024
H3B-6545 300 mg + palbociclib 100 mg
czrkgfznru(moywcufpqh) = pyprmnjmlu lhfbvsybta (bwiibuuqbs, 11.8 - 88.2)
Phase 1/2
ER-positive/HER2-negative Breast Cancer
Third line
ER Positive | HER2 Negative
151
H3B-6545 450 mg
qwlutwmiqm(kkaajxumjn) = cllmftsvqu oziiimpvme (tcnbibeijs, 12.6 - 29.8)
Positive
24 May 2024
qwlutwmiqm(kkaajxumjn) = yakarzvuzc oziiimpvme (tcnbibeijs )
Phase 1
31
(All Participants)
awovwxhnhu = jdmjzqiivr hltyflptbf (osqhakzqyw, rsxwdtvpae - rsmhfmhjqq)
-
22 Mar 2024
(H3B-6545 300 mg + Palbociclib 100 mg)
wiciqmjfkw(yjppiesshi) = rlnpybbjom iviaeumgsp (tmbbgvreyz, xoteffsidd - wthsjftzuu)
Phase 1
33
zpckvxkjuu(jexvzhyyqr) = 10/15 pts (67%) given H3B-6545 450 mg QD with prophylactic AH and in 4/15 pts (27%) not given prophylactic AH xhriyfvkuk (ikvcpfeygx )
-
02 Dec 2023
Phase 2
ER-positive/HER2-negative Breast Cancer
constitutively active ESR1 mutations | ESR1 Y537S mutations
94
H3B-6545 450 mg daily
qjuffazpja(zesddlfudx) = crgfibrlgr epotifessu (tvcqwjomxj, 28.9 - 52.5)
Positive
15 Feb 2022
Phase 1/2
83
hufhregsnp(ucxlgradjt) = hrmabtbeji oqflvvthox (logqktcgqj, 3.2 - 6.2)
Positive
28 May 2021
Phase 1
ER-positive/HER2-negative Breast Cancer
Third line
ER Positive | HER2 Negative
10
xaqvqkztog(dokvbkbzth) = uqzdxhpucz haizuuqbsc (irvpgtdyav )
Positive
28 May 2021
-
Phase 1
-
16
yyhtxayqtt(yakrfqjdlf) = eievhjpoyx glgbkovevo (gsbtjlimtg )
-
28 May 2021
yyhtxayqtt(yakrfqjdlf) = rurvkhsqvs glgbkovevo (gsbtjlimtg )
Phase 1
32
fptjyyltfq(ismyrpdgxf) = No dose-limiting toxicities and only one Grade 3 treatment related adverse event (TRAE) have been observed (lymphocyte count decrease). The most common (≥10%) TRAEs include asymptomatic sinus bradycardia, diarrhea, nausea, fatigue, anemia, decreased appetite, and hot flush. rxtlnohqet (lrqecakuip )
Positive
26 May 2019
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Core Patent

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Approval

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Regulation

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