NCT06757634 · Celcuity Inc
Phase 3 Study of Gedatolisib as First-Line Treatment for Patients With HR-Positive, HER2-Negative Advanced Breast Cancer (VIKTORIA-2)
What this study is about
This is a Phase 3, where both patients and doctors know the treatment given, randomly assigned, clinical trial evaluating the effectiveness and safety of gedatolisib plus fulvestrant and CDK4/6 Inhibitors for the treatment of patients with locally advanced or metastatic HR+/HER2- advanced breast cancer.
View original scientific description
This is a Phase 3, open-label, randomized, clinical trial evaluating the efficacy and safety of gedatolisib plus fulvestrant and CDK4/6 Inhibitors for the treatment of patients with locally advanced or metastatic HR+/HER2- advanced breast cancer.
Interventions
DRUG
Arm A: Gedatolisib + Palbociclib + Fulvestrant
Drug: Gedatolisib Participants will receive intravenous (IV) gedatolisib once weekly for 3 weeks (Days 1, 8, 15) followed by 1 week off Other Names: • PF-05212384 Drug: Palbociclib Participants will receive oral palbociclib on days 1-21 of each 28-day cycle. Other Names: • IBRANCE Drug: Fulvestrant Participants will receive intramuscular (IM) fulvestrant every 2 weeks during Cycle 1 and then every 4 weeks Other Names: • Faslodex
DRUG
Arm B: Ribociclib + Fulvestrant
Drug: Ribociclib Participants will receive oral ribociclib on Days 1-21 of each 28-day cycle Other Names: • KISQALI® Drug: Fulvestrant Participants will receive intramuscular (IM) fulvestrant approximately every 2 weeks during Cycle 1 then approximately every 4 weeks Other Names: • Faslodex
DRUG
Arm C: Gedatolisib + Palbociclib + Letrozole
Drug: Gedatolisib Participants will receive intravenous (IV) gedatolisib once weekly for 3 weeks (Days 1, 8, 15) followed by 1 week off Drug: Palbociclib Participants will receive oral palbociclib on days 1-21 of each 28-day cycle. Drug: Letrozole Participants will receive oral letrozole daily.
DRUG
Arm D: Ribociclib + Letrozole
Drug: Ribociclib Participants will receive oral ribociclib on Days 1-21 of each 28-day cycle Drug: Letrozole Participants will receive oral letrozole daily.
Primary outcome measures
Progression Free Survival (PFS)
Time frame: From date of randomization to the date of death due to any cause, up to approximately 48 months
PFS is defined as the time from randomization to death or the first documented progression, whichever occurs first, confirmed by Response Evaluation Criteria in Solid Tumors (RECIST) v1.1 criteria, as determined based on blinded independent central review (BICR)
Who can participate
This study lists these criteria on ClinicalTrials.gov. A study coordinator reviews eligibility during screening — this page does not determine whether you qualify.
Inclusion criteria
- Histologically or cytologically confirmed diagnosis of metastatic or locally advanced HR+/HER2- breast cancer
- Adult females, pre- and/or post-menopausal, and adult males. Pre-menopausal (and peri-menopausal) women can be enrolled if amenable to treatment with an LHRH agonist. Patients are to have commenced concomitant treatment with LHRH agonist prior to or on Cycle 1, Day 1 and must be willing to continue for the duration of the study.
- Negative pregnancy test for females of childbearing potential. Female subjects who are not surgically sterile must use a medically effective contraceptive method from screening until 2 years after the last dose of study treatment.
- Progression of disease during or within 12 months of completing (neo)adjuvant endocrine therapy (ET) or progression of disease after 12 months of completing (neo)adjuvant ET.
- Adequate archival, fresh tumor tissue, or liquid biopsy for the analysis of PIK3CA mutational status.
- Permitted prior therapies:
- (neo)adjuvant fulvestrant only if the treatment duration \< 6 months
- (neo)adjuvant chemotherapy
- (neo)adjuvant CDK4/6 inhibitor, unless PD was on or within 6 months of discontinuation of CDK4/6i i. Study 1: if disease progression was on or within event occurred \>6 months of discontinuation after completion of CDK4/6 inhibitor portion of treatment. ii. Study 2: if disease progression event occurred \>12 months after completion of CDK4/6 inhibitor portion of treatment.
- Subject has radiologically measurable disease according to RECIST v1.1, per local assessment. Patients with nonmeasurable bone-only disease are not eligible. Patients with bone-only disease that has lytic or mixed lytic/blastic lesions and at least one measurable soft tissue component per RECIST v1.1 may be eligible.
- Eastern Cooperative Oncology Group (ECOG) performance status of 0-2.
- Life expectancy of at least \>6 months.
- Adequate bone marrow, hepatic, renal and coagulation function.
Exclusion criteria
- Concurrent malignancies other than adequately treated non-melanoma skin cancer. Previous malignancies in remission but curatively treated with no evidence of disease progression and judged by local Investigator to be at low risk of impacting health or survival while on study.
- Prior treatment with a phosphoinositide 3-kinase (PI3K) inhibitor, a protein kinase B (Akt) inhibitor, or a mechanistic target of rapamycin (mTOR) inhibitor or any other selective estrogen receptor degrader (SERD), except fulvestrant, used in (neo)adjuvant setting.
- Prior treatment with systemic anticancer therapy for ABC
- Subjects with type 1 diabetes, or uncontrolled type 2 diabetes requiring daily insulin therapy.
- Known and untreated, or active, brain or leptomeningeal metastases
- History of clinically significant cardiovascular abnormalities
- Known, clinically significant ophthalmic conditions
- History of drug-induced symptomatic interstitial lung disease (pneumonitis) or hepatitis
Where
- Jonesboro, Arkansas
- Little Rock, Arkansas
- Duarte, California
- Fullerton, California
- Los Angeles, California
- Redondo Beach, California
- San Diego, California
- Aurora, Colorado
- Plantation, Florida
- Tamarac, Florida
- Westwood, Kansas
- Paducah, Kentucky
And 18 more locations — see the full list below.
Related conditions & keywords
Frequently asked questions
What is a clinical trial?
A clinical trial is a research study that tests new medical treatments, drugs, devices, or procedures to determine their safety and effectiveness. Trials are carefully designed and monitored to protect participants while advancing medical knowledge.
Is it safe to participate?
Clinical trials follow strict safety guidelines and ethical standards. Trials must be reviewed and approved, and participants are closely monitored by medical professionals throughout the study. You can withdraw at any time if you choose.
Will I be compensated?
Many clinical trials offer compensation for your time, travel expenses, and inconvenience. The specific compensation varies by study and will be discussed during the screening process. All study-related medical care is typically provided at no cost to participants.
Will I receive a placebo instead of treatment?
When effective treatment exists, participants typically receive either the standard treatment plus the study intervention, or the standard treatment plus placebo. You would not be denied effective care. Placebos are primarily used when no proven treatment is available, or in addition to standard care. Your trial consent form will clearly explain what treatments you may receive.
Can I leave a trial if I change my mind?
Absolutely. Participation in clinical trials is completely voluntary. You have the right to withdraw from the study at any time, for any reason, without penalty or loss of benefits to which you are otherwise entitled.
How long does a clinical trial last?
Trial duration varies widely depending on the study design and purpose. Some trials last just a few weeks, while others may continue for months or years. The study coordinator will provide specific timeline information during your screening call.
Data: ClinicalTrials.gov · synced Oct 9, 2026 · Source of record for eligibility and locations