NCT05477576 · RayzeBio, Inc.
Study of RYZ101 Compared With SOC in Pts w Inoperable SSTR+ Well-differentiated GEP-NET That Has Progressed Following 177Lu-SSA Therapy
(ACTION-1)
What this study is about
This study aims to determine the safety, how the drug moves through the body (PK) and recommended Phase 3 dose (RP3D) of RYZ101 in Part 1, and the safety, effectiveness, and PK of RYZ101 compared with investigator-selected the usual treatment (SoC) therapy in Part 2 in subjects with inoperable, advanced, well-differentiated, somatostatin receptor expressing (SSTR+) gastroenteropancreatic neuroendocrine tumors (GEP-NETs) that have progressed following treatment with Lutetium 177-labelled somatostatin analogue (177Lu-SSA) t
View original scientific description
This study aims to determine the safety, pharmacokinetics (PK) and recommended Phase 3 dose (RP3D) of RYZ101 in Part 1, and the safety, efficacy, and PK of RYZ101 compared with investigator-selected standard of care (SoC) therapy in Part 2 in subjects with inoperable, advanced, well-differentiated, somatostatin receptor expressing (SSTR+) gastroenteropancreatic neuroendocrine tumors (GEP-NETs) that have progressed following treatment with Lutetium 177-labelled somatostatin analogue (177Lu-SSA) t
Interventions
DRUG
RYZ101
RP3D as determined in Phase 1b
DRUG
Everolimus
Everolimus
DRUG
Sunitinib
Sunitinib
DRUG
Octreotide
High-dose octreotide
DRUG
Lanreotide
Lanreotide
Primary outcome measures
Phase 1b: RP3D
Time frame: 56 days of study treatment
Incidence of DLTs during the first 56 days of study treatment will be assessed.
Phase 3: PFS as determined by BICR
Time frame: After the target number of 143 PFS events have occurred
PFS will be defined as the time from the date of randomization until the date of progression (as determined by BICR from tumor assessments using RECIST v1.1) or death due to any cause, whichever occurs earlier.
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 proven, Grade 1-2 well differentiated, inoperable, advanced GEP-NETs (Ki67 ≤20%) Eastern Cooperative Oncology Group (ECOG) status 0-2
- Progressive, SSTR-PET positive (i.e., Krenning score 3 or 4) GEP-NET (GI or pancreas) following 2-4 cycles of treatment with 177Lu-labeled SSA. Must have achieved disease control for at least 6 months following Lu-177 SSA. No time limit is defined between 177Lu-SSA treatment and randomization. There must be at least 1 SSTR-PET imaging-positive measurable site of disease (according to RECIST v1.1) and no RECIST v1.1 measurable metastatic lesions that are SSTR imaging-negative.
- Adequate renal function, as evidenced by estimated glomerular filtration rate (eGFR) ≥60 mL/min/1.73 m2 (calculated using the Chronic Kidney Disease Epidemiology Collaboration \[CKD-EPI\]) (Levey et al. 2009)
- Adequate hematologic function, defined by the following laboratory results:
- Part 2: Hemoglobin concentration ≥5.0 mmol/L (≥8.0 g/dL); ANC ≥
Where
- Phoenix, Arizona
- Duarte, California
- Irvine, California
- Los Angeles, California
- Palo Alto, California
- San Francisco, California
- New Haven, Connecticut
- Washington D.C., District of Columbia
- Jacksonville, Florida
- Miami, Florida
- Tampa, Florida
- Atlanta, Georgia
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 Mar 30, 2026 · Source of record for eligibility and locations