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STX-478 Targeted Therapy for Advanced HR+, HER2- Breast Cancer with a PI3K Mutation

First-in-Human Study of STX-478, a Mutant-Selective PI3Kα Inhibitor as Monotherapy and in Combination With Other Antineoplastic Agents in Participants With Advanced Solid Tumor

Purpose: To study the safety, best dose, effects (good and bad), and anti-cancer activity of STX-478, an experimental PI3K inhibitor, alone or with fulvestrant (Faslodex®) hormone therapy.

Who is this for?: People with advanced (stage III) or metastatic (stage IV) hormone receptor positive (ER+ and/or PR+), HER2 negative (HER2-) breast cancer with a PI3K mutation. You must not have a PTEN, AKT, or mTOR mutation. View full eligibility criteria

What's involved?

<p class="seamTextPara"> You will be assigned to 1 of 2 groups: </p> <p class="seamTextPara"> <i class="seamTextEmphasis">Group 1</i> </p> <ul class="seamTextUnorderedList"> <li class="seamTextUnorderedListItem">STX-478</li> </ul> <p class="seamTextPara"> <i class="seamTextEmphasis">Group 2</i> </p> <ul class="seamTextUnorderedList"> <li class="seamTextUnorderedListItem">STX-478</li> <li class="seamTextUnorderedListItem">Fulvestrant (Faslodex®)</li> </ul> <p class="seamTextPara"> <i class="seamTextEmphasis">Please contact research site for treatment schedule</i></p>

What's being studied?

<ul class="seamTextUnorderedList"> <li class="seamTextUnorderedListItem">STX-478 is an experimental targeted therapy called a PI3K inhibitor. Blocking the PI3K pathway may slow or stop cancer cells from growing.</li> <li class="seamTextUnorderedListItem">Fulvestrant (Faslodex®) is a type of hormone therapy called a selective estrogen receptor degrader (SERD). SERDs bind to and break down estrogen receptors.</li> <li class="seamTextUnorderedListItem">Targets or mutations: PI3K</li></ul>

How can I learn more?

<ul class='seamTextUnorderedList'><li class='seamTextUnorderedListItem'>View eligibility criteria and additional trial information: <a href='https://clinicaltrials.gov/ct2/show/NCT05768139' target='_blank'>ClinicalTrials.gov</a> </li><li class='seamTextUnorderedListItem'><a href='https://www.scorpiontx.com/pipeline/' target='_blank'>Scorpion Therapeutics: STX-478 Drug Information Page</a> </li><li class='seamTextUnorderedListItem'><a href='https://www.breastcancer.org/treatment/hormonal-therapy/faslodex' target='_blank'>Breastcancer.org: Fulvestrant (Faslodex®)</a> </li></ul>
1

STX-478 Targeted Therapy for Advanced HR+, HER2- Breast Cancer with a PI3K Mutation

First-in-Human Study of STX-478, a Mutant-Selective PI3Kα Inhibitor as Monotherapy and in Combination With Other Antineoplastic Agents in Participants With Advanced Solid Tumor
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Nearest Location:
3 miles
University of California, San Francisco
San Francisco, CA

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Visits:
Number of visits unavailable

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ClinicalTrials.gov: NCT05768139

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Phase I-II

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