Ignite Creation Date:
2025-12-24 @ 6:50 PM
Ignite Modification Date:
2026-01-02 @ 9:36 AM
Study NCT ID:
NCT06607757
Status:
RECRUITING
Last Update Posted:
2025-04-02
First Post:
2024-06-14
Is NOT Gene Therapy:
True
Has Adverse Events:
False
Brief Title:
Capivasertib Plus Fulvestrant vs. Fulvestrant in Primary High-risk Lobular Breast Cancer
Sponsor:
GBG Forschungs GmbH
Organization:
Study Overview
Official Title:
Phase II Neoadjuvant Study Evaluating Capivasertib Plus Fulvestrant vs Fulvestrant in Patients With Primary High-risk Lobular Breast Cancer- LOBSTER
Status:
RECRUITING
Status Verified Date:
2025-03
Last Known Status:
None
Delayed Posting:
No
If Stopped, Why?:
Not Stopped
Has Expanded Access:
False
If Expanded Access, NCT#:
N/A
Has Expanded Access, NCT# Status:
N/A
Acronym:
None
Brief Summary:
This is a multicenter, prospective, open-label, randomized phase II study to evaluate the CCCA assessed by Ki67 drop below \<2.7% from baseline to week 2 (window of opportunity) and to week 10 with capivasertib plus fulvestrant compared with fulvestrant alone as neoadjuvant treatment for primary high-risk lobular breast cancer patients.
120 patients will be randomized to receive:
\- Capivasertib (400 mg po twice daily d1-4 followed by 3 days off) for 2 weeks followed by capivasertib (400 mg po twice daily d1-4 followed by 3 days off) and fulvestrant (500 mg i.m. q28d, with an additional 500 mg dose given two weeks after the initial dose) for additional 8 weeks (overall 4 administrations of fulvestrant)
or
\- Fulvestrant (500mg i.m. q28d, with an additional 500 mg dose given two weeks after the core biopsy and the initial dose) for 10 weeks (overall 4 administrations) Treatment will be given until surgery/core-biopsy, disease progression, unacceptable toxicity, or withdrawal of consent of the patient.
All patients will undergo core-biopsies, under treatment and after completing study therapy in order to assess Ki67%. Further treatment including surgery, (neo)adjuvant chemotherapy, radiotherapy, and (neo)adjuvant endocrine therapy will be administered at the discretion of the investigator and according to standard of care outside the clinical trial.
120 patients will be randomized to receive:
\- Capivasertib (400 mg po twice daily d1-4 followed by 3 days off) for 2 weeks followed by capivasertib (400 mg po twice daily d1-4 followed by 3 days off) and fulvestrant (500 mg i.m. q28d, with an additional 500 mg dose given two weeks after the initial dose) for additional 8 weeks (overall 4 administrations of fulvestrant)
or
\- Fulvestrant (500mg i.m. q28d, with an additional 500 mg dose given two weeks after the core biopsy and the initial dose) for 10 weeks (overall 4 administrations) Treatment will be given until surgery/core-biopsy, disease progression, unacceptable toxicity, or withdrawal of consent of the patient.
All patients will undergo core-biopsies, under treatment and after completing study therapy in order to assess Ki67%. Further treatment including surgery, (neo)adjuvant chemotherapy, radiotherapy, and (neo)adjuvant endocrine therapy will be administered at the discretion of the investigator and according to standard of care outside the clinical trial.
Detailed Description:
The evaluation of CCCA in the HR+/HER2- invasive lobular breast cancer patient population allows assessment of treatment efficacy with an achievable sample size of HR+/HER2- breast cancer patients within an acceptable and scientifically meaningful duration of recruitment. CCCA can be assessed immediately after last patients end of treatment. Central blinded pathological assessment of CCCA is planned in this study as a standardized preparation of the sampled tissue by the central pathologist. This pathologist is blinded regarding the study therapy administered, i. e. with or without capivasertib.
The addition of capivasertib to fulvestrant in many clinical trials correlates with an improvement in PFS compared to fulvestrant alone in patients with HR+/HER2- locally advanced or metastatic breast cancer. This effect was observed regardless of a PI3K/AKT/mTOR pathway activation. None of the ongoing studies investigate the effects of the combined treatment in invasive lobular breast cancer. Given that these tumors are less likely to respond to chemotherapy, identification of patients that can be spared from chemotherapy is desirable. On the other hand, it is important to identify patients with invasive lobular breast cancer not responding to neoadjuvant ET who might be at increased risk for recurrence, who would therefore potentially benefit from further adjuvant therapies including chemotherapy.
Given the high rates of PI3K pathway alterations in such tumors, it is expected that the CCCA rate could be increased by adding capivasertib to fulvestrant. GBG expect that the potential benefit of improved CCCA rate with a combination treatment compared to fulvestrant monotherapy would outweigh the potential risks due to added toxicity, which has already been shown in clinical trials to be well tolerated by patients.
The addition of capivasertib to fulvestrant in many clinical trials correlates with an improvement in PFS compared to fulvestrant alone in patients with HR+/HER2- locally advanced or metastatic breast cancer. This effect was observed regardless of a PI3K/AKT/mTOR pathway activation. None of the ongoing studies investigate the effects of the combined treatment in invasive lobular breast cancer. Given that these tumors are less likely to respond to chemotherapy, identification of patients that can be spared from chemotherapy is desirable. On the other hand, it is important to identify patients with invasive lobular breast cancer not responding to neoadjuvant ET who might be at increased risk for recurrence, who would therefore potentially benefit from further adjuvant therapies including chemotherapy.
Given the high rates of PI3K pathway alterations in such tumors, it is expected that the CCCA rate could be increased by adding capivasertib to fulvestrant. GBG expect that the potential benefit of improved CCCA rate with a combination treatment compared to fulvestrant monotherapy would outweigh the potential risks due to added toxicity, which has already been shown in clinical trials to be well tolerated by patients.
Study Oversight
Has Oversight DMC:
True
Is a FDA Regulated Drug?:
False
Is a FDA Regulated Device?:
False
Is an Unapproved Device?:
None
Is a PPSD?:
None
Is a US Export?:
None
Is an FDA AA801 Violation?:
Secondary ID Infos
| Secondary ID | Type | Domain | Link | View |
|---|---|---|---|---|
| 2023-509292-17-00 | CTIS | None | View |