A Phase 1/2 interventional study of Atezolizumab - 28 Day Cycle and Bevacizumab in Endometrial Cancer, sponsored by Alliance Foundation Trials, LLC.. Recruiting at 21 sites in United States. Open to female participants aged 18 Years and older. Per ClinicalTrials.gov, last updated 2026-04-01.
Sponsored by Alliance Foundation Trials, LLC. · Phase 1/2, Interventional, and Treatment
This is a Phase IB/II multi-cohort study designed to evaluate the efficacy and safety of targeted agents with or without cancer immune checkpoint therapy with atezolizumab in participant with recurrent and/or persistent endometrial cancer. The main protocol provides a platform for genomic screening with homogeneous basic eligibility criteria in order to direct study participants into biomarker-matched study cohorts consisting of testing targeted agents.
This is a Phase IB/II multi-cohort study designed to evaluate the efficacy and safety of targeted agents with or without cancer immune checkpoint therapy with atezolizumab in participants with recurrent and/or persistent endometrial cancer.
This biomarker-driven study provides a platform whereby participants with persistent/recurrent endometrial cancer will be placed into study cohorts evaluating targeted agents selected on the basis of the tumor's specific genomic profile. Prospective participants with persistent and/or recurrent endometrial cancer will be prescreened within 60 days of treatment assignment to have a tumor tissue sample submitted for next-generation sequencing (NGS) using FoundationOne® companion diagnostic (CDx) testing prior to entering screening. If a participant has FoundationOne® CDx testing within five years of enrollment, the previous tumor tissue may be re-analyzed for use in the study. Non-FMI NGS testing may be submitted if approved.
Depending on the cohort assignment per the tumor's biomarker profile, participants will be assigned to the AFT-50A Protocol (atezolizumab+targeted agent) or the AFT-50B Protocol (non-atezolizumab targeted agents). The current study cohorts are as follows:
AFT-50A Cohorts
AFT-50B Cohorts
It is anticipated that approximately 20 participants will be enrolled in each study cohort in AFT-50A and 24 participants in each study cohort in AFT-50B, unless otherwise specified for a given cohort due to statistical considerations. Each study cohort will open/close independently of other study cohorts. Once a study cohort reaches the prespecified number of participants, it will be closed to further enrollment, unless an expansion phase is planned.
The study is structured to allow for additional cohorts to be added as the study progresses. These additional study cohorts may be proposed by investigators, but requires approval by the Steering Committee in order to be added to the protocol.
1,425 studies on the registry are indexed under Endometrial Neoplasms; 473 are open to participants now.
This study's planned enrollment of 148 is above the median of 71 across 1,026 interventional studies indexed under Endometrial Neoplasms.
Browse Endometrial Neoplasms studies →Alliance Foundation Trials, LLC. is the lead sponsor of 22 studies on the registry; 3 are open to participants now.
Of its 6 completed or terminated interventional studies of FDA-regulated products, 5 (83%) have results posted.
Counted across the registry records on this site, refreshed daily.
Key Inclusion Criteria:
Key Exclusion Criteria:
AFT-50A Specific Exclusion Criteria:
● Prior treatment with T-cell costimulating or immune checkpoint blockade therapies including, but not limited to, CD137 agonists, , anti-PD-L1, and anti-CTLA-4 therapeutic antibodies
Note: Additional study cohort specific inclusion and exclusion criteria may apply based on cohort assignment.
Underlined terms in the criteria open these too. Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
A line of therapy is one course of treatment, which may combine several drugs. First-line is the first course given; second-line follows when that stops working or is not tolerated.
“Two prior lines” means two courses that count separately under the study’s rules — not simply two drugs. Ask the study team if you are unsure how yours are counted.
The amount of disease can be tracked with a defined measurement, so the study can see whether it shrinks or grows. It might be a tumour measured on a scan or, in some blood cancers such as myeloma, a marker measured in blood or urine.
The criteria or the study team say which measurement counts — having no tumour visible on a scan does not by itself rule you out.
The standard rules for measuring tumours on CT or MRI scans, to tell whether a cancer is shrinking, stable or growing during treatment.
“Measurable disease per RECIST 1.1” usually means at least one tumour 10 mm or more at its longest on a CT scan, or a lymph node 15 mm or more across its short axis.
The study doctor’s estimate of how long someone is likely to live. Criteria use it so that people can stay in the study long enough for it to answer its question.
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Neoadjuvant treatment is given before the main treatment (usually surgery), often to shrink a tumour. Adjuvant treatment is given after it, to lower the chance of the cancer coming back.
A condition in which the immune system attacks the body’s own tissues, such as rheumatoid arthritis, lupus, psoriasis, type 1 diabetes or inflammatory bowel disease.
Immunotherapy studies often leave out active autoimmune disease, and some name exceptions, such as thyroid disease on replacement hormone. Check the exceptions this study lists.
Vaccines made with a weakened form of the germ, such as measles–mumps–rubella (MMR), chickenpox and yellow fever. They can be risky when the immune system is weakened. Flu injections are not live; the nasal flu spray is.
Stem cell (bone marrow) transplants. Allogeneic uses cells from a donor; autologous uses your own cells, collected earlier and given back.
A weakened immune system. It can come from an illness, such as HIV or some blood cancers, or from medicines that turn the immune system down, for example after an organ transplant or for an autoimmune disease; steroids at higher doses count.
Read whether the line is about a condition or about medicines, and which medicines and doses it means.
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
Chronic obstructive pulmonary disease: long-term lung disease that makes it hard to breathe out, including emphysema and chronic bronchitis.
A “mini-stroke”: temporary stroke-like symptoms caused by reduced blood flow to part of the brain, spinal cord or eye, without signs of a new stroke on a scan.
Stroke symptoms need emergency care at once, even if they go away.
PD-1, PD-L1 and CTLA-4 are proteins that act as brakes on the immune system. Checkpoint inhibitors, such as pembrolizumab or nivolumab, block them so the immune system can attack a cancer.
PD-L1 can also be measured in a tumour sample. Some scores count stained tumour cells only (TPS); others also count certain immune cells (CPS). The study names the score and the minimum it uses.
Line of therapy
A line of therapy is one course of treatment, which may combine several drugs. First-line is the first course given; second-line follows when that stops working or is not tolerated.
“Two prior lines” means two courses that count separately under the study’s rules — not simply two drugs. Ask the study team if you are unsure how yours are counted.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Measurable disease
The amount of disease can be tracked with a defined measurement, so the study can see whether it shrinks or grows. It might be a tumour measured on a scan or, in some blood cancers such as myeloma, a marker measured in blood or urine.
The criteria or the study team say which measurement counts — having no tumour visible on a scan does not by itself rule you out.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
RECIST
The standard rules for measuring tumours on CT or MRI scans, to tell whether a cancer is shrinking, stable or growing during treatment.
“Measurable disease per RECIST 1.1” usually means at least one tumour 10 mm or more at its longest on a CT scan, or a lymph node 15 mm or more across its short axis.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Life expectancy
The study doctor’s estimate of how long someone is likely to live. Criteria use it so that people can stay in the study long enough for it to answer its question.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Cancer (malignancy)
Malignancy means cancer. Criteria about another or earlier malignancy ask whether you have had a different cancer, usually within a set number of years.
Some are commonly allowed, such as treated skin cancers other than melanoma and early cancers removed completely — check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Adjuvant and neoadjuvant
Neoadjuvant treatment is given before the main treatment (usually surgery), often to shrink a tumour. Adjuvant treatment is given after it, to lower the chance of the cancer coming back.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Autoimmune disease
A condition in which the immune system attacks the body’s own tissues, such as rheumatoid arthritis, lupus, psoriasis, type 1 diabetes or inflammatory bowel disease.
Immunotherapy studies often leave out active autoimmune disease, and some name exceptions, such as thyroid disease on replacement hormone. Check the exceptions this study lists.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Live vaccines
Vaccines made with a weakened form of the germ, such as measles–mumps–rubella (MMR), chickenpox and yellow fever. They can be risky when the immune system is weakened. Flu injections are not live; the nasal flu spray is.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Allogeneic and autologous transplant
Stem cell (bone marrow) transplants. Allogeneic uses cells from a donor; autologous uses your own cells, collected earlier and given back.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Immunosuppression
A weakened immune system. It can come from an illness, such as HIV or some blood cancers, or from medicines that turn the immune system down, for example after an organ transplant or for an autoimmune disease; steroids at higher doses count.
Read whether the line is about a condition or about medicines, and which medicines and doses it means.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Corticosteroids (steroids)
Anti-inflammatory medicines such as prednisone, prednisolone and dexamethasone — not the anabolic steroids used for muscle.
Studies differ in what they allow: check which steroid medicines, routes (tablets, injections, creams, inhalers, eye drops) and doses this study accepts.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
COPD
Chronic obstructive pulmonary disease: long-term lung disease that makes it hard to breathe out, including emphysema and chronic bronchitis.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
TIA (transient ischaemic attack)
A “mini-stroke”: temporary stroke-like symptoms caused by reduced blood flow to part of the brain, spinal cord or eye, without signs of a new stroke on a scan.
Stroke symptoms need emergency care at once, even if they go away.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
PD-1, PD-L1 and checkpoint inhibitors
PD-1, PD-L1 and CTLA-4 are proteins that act as brakes on the immune system. Checkpoint inhibitors, such as pembrolizumab or nivolumab, block them so the immune system can attack a cancer.
PD-L1 can also be measured in a tumour sample. Some scores count stained tumour cells only (TPS); others also count certain immune cells (CPS). The study names the score and the minimum it uses.
Explained by clinicaltrials.gg, not part of the registry record. The study team decides who can take part.
Following the submission of tumor tissue for the FoundationOne® companion diagnostic (F1CDx) test, participants with no specified gene signatures will be enrolled in this cohort. Twenty participants will be enrolled. Once twenty participants are enrolled, the cohort will be closed to further enrollment. Participants in this study cohort will commence treatment as specified on Day 1 of each cycle.
Drug: Atezolizumab - 28 Day Cycle · Drug: Bevacizumab
Following the submission of tumor tissue for the FoundationOne® companion diagnostic (F1CDx) test, participants with PIK3CA/AKT1/PTEN-altered tumors will be enrolled in this cohort. Twenty participants will be enrolled. Once twenty participants are enrolled, the cohort will be closed to further enrollment. Participants in this study cohort will commence treatment as specified on Day 1 of each cycle.
Drug: Atezolizumab - 28 Day Cycle · Drug: Ipatasertib
Following the submission of tumor tissue for the FoundationOne® companion diagnostic (F1CDx) test, participants with tumors that have a ≥16%genomic loss of heterozygosity (LOH) will be assigned to this cohort. Twenty participants will be enrolled. Once twenty participants are enrolled, the cohort will be closed to further enrollment. Participants in this study cohort will commence treatment as specified on Day 1 of each cycle.
Drug: Atezolizumab - 28 Day Cycle · Drug: Talazoparib
Following the submission of tumor tissue for the FoundationOne® companion diagnostic (F1CDx) test, participants with tumors that with an amplification of ERBB2/HER2 will be assigned to this cohort. Twenty participants will be enrolled. Once twenty participants are enrolled, the cohort will be closed to further enrollment. Participants in this study cohort will commence treatment as specified on Day 1 of each cycle.
Drug: Trastuzumab emtansine · Drug: Atezolizumab - 21 Day Cycle
Following the submission of tumor tissue for the FoundationOne® companion diagnostic (F1CDx) test, participants with tumor type MSI-H and/or tTMB \>=10 mut/mb will be assigned to this cohort. Twenty participants will be enrolled initially. Once twenty participants are enrolled, the cohort may be expanded if a positive signal is shown. Participants in this study cohort will commence treatment as specified on Day 1 of each cycle.
Drug: Atezolizumab - 28 Day Cycle · Drug: Tiragolumab
Following the submission of tumor tissue for the FoundationOne® companion diagnostic (F1CDx) test, participants with tumors that with PIK3CA activating mutations in the absence of PTEN loss-of-function alterations or AKT1 activating mutations will be assigned to this cohort. Twenty-four participants will be enrolled. Once twenty-four participants are enrolled, the cohort will be closed to further enrollment. Participants in this study cohort will commence treatment as specified on Day 1 of each cycle.
Drug: Inavolisib · Drug: Letrozole
Following the submission of tumor tissue for the FoundationOne® companion diagnostic (F1CDx) test, participants with tumors that are RB1 intact with a local grade 1-2 estrogne receptor positive (ER+) are assigned to this cohort. Twenty-four participants will be enrolled. Once twenty-four participants are enrolled, the cohort will be closed to further enrollment. Participants in this study cohort will commence treatment as specified on Day 1 of each cycle.
Drug: Giredestrant · Drug: Abemaciclib
Atezolizumab will be given to participants intravenously at a dosage of 1680 mg on day 1 of each 28-day cycle.
Also known as: Tecentriq, L01XC32
Bevacizumab will be given to participants intravenously at a dosage of 10mg per participant kilogram every 2 weeks of the 28-day cycle.
Also known as: Avastin, L01XC07
Ipatasertib will be given as an orally at a dosage of 400 mg once daily for 21 days of each 28-day cycle.
Also known as: RG7440, GDC-0068
Talazoparib will be given in an orally at a dosage of 1 mg once daily for each day of the 28-day cycle.
Also known as: Talzenna, L01XX60
Trastuzumab emtansine be given to participants intravenously at a dosage of 3.6 mg per participant kilogram, on day 1 of each 21-day cycle.
Also known as: T-DM1, Kadcyla
Tiragolumab will be given to participants intravenously at a dosage of 840 mg on day 1 of each 28-day cycle.
Atezolizumab will be given to participants intravenously at a dosage of 1200 mg on day 1 of each 21-day cycle.
Also known as: Tecentriq, L01XC32
Inavolisib will be given in an orally at a dosage of 9 mg once daily for each day of the 28-day cycle.
Also known as: GDC-0077
Letrozole will be given orally at a dosage of 2.5 mg once daily for each day of the 28-day cycle.
Also known as: Femara
Giredestrant will be given orally at a dosage of 30 mg once daily for each day of the 28-day cycle.
Also known as: GDC-9545
Giredestrant will be given orally at a dosage of 150 mg twice daily for each day of the 28-day cycle.
Also known as: Verzenio
Investigator-assessed overall response rate (ORR) of each biomarker cohort
AFT-50A Protocol: Overall response rate for each biomarker cohort is defined as the proportion of participants achieving a complete (CR) or partial (PR) response on two consecutive occasions at least 4 weeks apart, as determined by the investigator from AFT50A Protocol: Tumor assessments per RECIST v1.1.
Time frame: 48 Months
The proportion of participants in each biomarker cohort who remain alive and progression-free for at least 6 months
AFT-50B Protocol: Progression free survival rate at 6 months is defined as the proportion of participants who have not experienced disease progression or death from any cause at 6 months, as determined by the investigator according to RECIST v1.1
Time frame: 6 Months
Relative proportion of participants in each biomarker cohort who remain progression-free for at least 6 months compared to that from historical control studies
AFT-50A Protocol: PFS rate at 6 months is defined as the proportion of participants who have not experienced disease progression or death from any cause at 6 months, as determined by the investigator according to RECIST v1.1
Time frame: 6 Months per cohort
Investigator assessed disease-control rate of each biomarker cohort
AFT-50A Protocol: Disease-control rate is defined as the proportion of participants achieving either stable disease, complete response, or partial response.
Time frame: 48 Months
Duration of response for participants in each biomarker cohort who achieve a complete or partial response.
AFT-50A Protocol: Duration of response is defined as the time from the first occurrence of a documented objective response to disease progression or death from any cause (whichever occurs first), as determined by the investigator according to RECIST v1.1.
Time frame: 48 Months
Overall survival (OS) rates of participants in each biomarker cohort after 24 months
AFT-50A Protocol: 24-month overall survival rate is defined as the proportion of participants who have not experienced death from any cause at 24 months.
Time frame: 24 Months per cohort
Investigator assessed disease-control rate of each biomarker cohort
AFT-50B Protocol: Disease control rate is defined as the proportion of participants achieving either stable disease, complete response, or partial response at any time.
Time frame: 48 Months
Duration of response for participants in each biomarker cohort who achieve a confirmed response (complete or partial)
AFT-50B Protocol: Duration of response is defined as the time from the first occurrence of a documented objective response (complete or partial) to disease progression or death from any cause (whichever occurs first), as determined by the investigator according to RECIST v1.1
Time frame: 48 Months
Overall survival rates of participants in each biomarker cohort
AFT-50B Protocol: 24-month overall survival rate is defined as the proportion of participants who have not experienced death from any cause at 24 months.
Time frame: 24 Months
Safety of each biomarker cohort: adverse events
AFT-50A Protocol: The incidence and severity of adverse events, with severity determined according to National Cancer Institute (NCI) Common Terminology Criteria for Adverse Events, Version 5.0 (NCI CTCAE v5.0), as well as summaries of changes in clinically relevant laboratory test results, changes in vital signs, and study treatment exposures for each biomarker cohort
Time frame: 48 Months
The safety of each biomarker cohort: Adverse Events
AFT-50B Protocol: The incidence and severity of adverse events, with severity determined according to National Cancer Institute (NCI) Common Terminology Criteria for Adverse Events, Version 5.0 (NCI CTCAE v5.0). Summaries of changes in clinically relevant laboratory test results, changes in vital signs, and study treatment exposures for each biomarker cohort
Time frame: 48 Months
Assess exploratory biomarkers in tumor tissue and peripheral blood, and their association with other molecular characteristics, disease status and/or participant response to study treatment
AFT-50A and AFT-50B Protocols: Association of exploratory biomarkers with clinical outcomes, including but not limited to molecular analysis of tumor tissue and peripheral blood, as well as cytokine/chemokine and cellular analysis of peripheral blood.
Time frame: 48 Months
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Plan to share: No
Started Oct 2021 (actual). Primary completion is estimated for Oct 2026, 59 months after the start.
Of 79 phase 1/2 interventional studies under Endometrial Neoplasms, half reached primary completion within 69 months of starting (the median), counting those still running; a quarter within 54 and three quarters within 106. This study's planned 59 months is below that.
How these figures are worked out, and which studies are left out of them.
Eligibility is decided by the study team. Share this record with your doctor or contact the team directly.
Contact study teamGet an email when the registry record changes — status, dates, results — or when someone posts here.
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Studies of the drugs tested here: Atezolizumab · Bevacizumab · Ipatasertib · Talazoparib · Ado-Trastuzumab Emtansine · Tiragolumab · Inavolisib · Giredestrant
Alliance Foundation Trials, LLC.