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Clinical Trial Summary

The study is a nationwide, multicenter single-arm phase 2 study. The current phase 2 study investigates the efficacy of the combination of fulvestrant and alpelisib directly after progression on fulvestrant (either in first or second line, with or without previous use of CDK4/6-inhibitor) in patients with HR+ HER2- advanced breast cancer with PIK3CA mutated tumors. All eligible patients must have progressive disease on fulvestrant as latest treatment line. Previous treatment with a CDK4/6 inhibitor in first or second line is obligatory. After progressive disease is confirmed, it is important to continue fulvestrant (without CDK4/6 inhibition) during the screening period awaiting study enrollment. After study enrollment all participants will be treated with alpelisib and fulvestrant beyond progression. Follow-up time will be until progression or death or until a different oncolytic treatment has started (in case no progressive disease during previous fulvestrant and alpelisib treatment has been documented). Should participants discontinue due to reasons other than progression or death (e.g. toxicity), then they should still be evaluated for disease progression every 8 weeks as per protocol until progression, unless they do not wish to proceed with these screenings, or receive a different oncolytic treatment.


Clinical Trial Description

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Study Design


Related Conditions & MeSH terms


NCT number NCT05392608
Study type Interventional
Source Borstkanker Onderzoek Groep
Contact Annemarie C.A.M. Almekinders, MD
Phone 020 512 2439
Email sequel@nki.nl
Status Recruiting
Phase Phase 2
Start date June 2, 2022
Completion date March 2028

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