Study of 68Ga-R10602

Phase 1 Imaging Study of 68Ga-R10602-101 in Hormone Receptor-Positive Breast Cancer

A phase 1 imaging study of 68Ga-R10602 in hormone-receptor positive breast cancer.

Study Overview

• Status: Recruiting
• Conditions: Hormone Receptor Positive Breast Adenocarcinoma; Locoregionally Recurrent Hormone-receptor Positive Breast Cancer; Metastatic Hormone Receptor Positive Breast Cancer
• Intervention / Treatment: Drug: 68Ga-R10602 injection

Detailed Description

There are three eligible disease populations for the study. Population 1 are patients with metastatic or locoregionally recurrent, endocrine-resistant, ER+ and/or PR+ breast cancer who have received at least one line of chemotherapy or ADC. Population 2 are patients with ER+ and HER2- locoregional or metastatic non-resectable breast adenocarcinoma with progression on at least one line of prior endocrine therapy in the adjuvant or metastatic setting and starting next line of therapy that will include tamoxifen, fulvestrant, aromatase inhibitor, or elacestrant with or without ovarian suppression. Population 3 are patients with ER+ and/or PR+ and HER2- breast cancer who are ineligible for Population 1 or 2. All disease populations are eligible for both cohorts.

Cohort 1 will consist of three dose de-escalating cohorts with four patients each for a total of twelve patients. Once the twelve patients have completed the dose de-escalation, the three dose levels will be evaluated, and additional subjects may be enrolled into Cohort 1 at the single chosen dose. All patients will undergo imaging at a single timepoint and no dosimetry will be performed.

In Cohort 2, approximately six to eight patients will receive the single chosen dose followed by imaging at five timepoints and blood dosimetry at seven timepoints.

• Study Type: Interventional
• Enrollment (Estimated): 36
• Phase: Phase 1

Contacts and Locations

• Study Contact: Name: Yael Cohen-Arazi; Phone Number: 858-218-6617; Email: R10602-101@radionetics.com
• Study Contact Backup: Name: Kristrun Stardal; Phone Number: 858-218-6617; Email: R10602-101@radionetics.com

Study Locations

• United States
  • California
    • Los Angeles, California, United States, 90095
      • Recruiting
      • UCLA Department of Medicine - Hematology/Oncology
      • Contact: Bhavisha Tailor; Phone Number: 424-402-9520; Email: btailor@mednet.ucla.edu
      • Principal Investigator: Nicolaos Palaskas, MD, PhD
  • Indiana
    • Indianapolis, Indiana, United States, 46202
      • Recruiting
      • Indiana University Melvin and Bren Simon Cancer Center
      • Principal Investigator: Kathy Miller, MD
      • Contact: Xin Bryan; Phone Number: 317-274-5495; Email: zhongx@iu.edu
  • Iowa
    • Iowa City, Iowa, United States, 52242
      • Recruiting
      • University of Iowa
      • Contact: Shannon Lehman; Phone Number: 319-356-2259; Email: shannon-lehman@uiowa.edu
      • Principal Investigator: Parren McNeely, MD
  • Michigan
    • Ann Arbor, Michigan, United States, 48109
      • Recruiting
      • University of Michigan Medicine
      • Contact: James Pool; Phone Number: 734-615-9016; Email: jampool@med.umich.edu
      • Contact: Benjamin Viglianti, MD; Phone Number: 734-615-9016; Email: bviglia@med.umich.edu
      • Principal Investigator: Benjamin Viglianti, MD
      • Sub-Investigator: Monika Burness, MD
  • Texas
    • Houston, Texas, United States, 77030
      • Recruiting
      • MD Anderson Cancer Center
      • Principal Investigator: Sanjit Tewari, MD
      • Contact: Edsel Esquivel; Phone Number: 832-794-1665; Email: efesquivel@mdanderson.org
      • Contact: Jorge Bellido; Phone Number: 713-501-0379; Email: jabellido@mdanderson.org
      • Sub-Investigator: Ajit Bisen, MD
  • Utah
    • Salt Lake City, Utah, United States, 844112
      • Recruiting
      • University of Utah, Huntsman Cancer Institute
      • Contact: Sam Mitchell; Phone Number: 801-213-6110; Email: sam.mitchell@hci.utah.edu
      • Principal Investigator: Jeffrey Yap, PhD

Participation Criteria

Eligibility Criteria

• Ages Eligible for Study: Adult; Older Adult
• Accepts Healthy Volunteers: No

Description

Inclusion Criteria:

1. Breast Cancer Eligibility:

   • Population 1: Pathologically confirmed ER and/or PR positive, locoregionally recurrent or metastatic breast cancer that is refractory to endocrine therapy (progression on at least one line of endocrine therapy and determined by the investigator that Study Participant would not benefit from additional endocrine therapy) who have received at least one line of chemotherapy or antibody drug conjugate in the metastatic setting (recurrence within 6 months of adjuvant chemotherapy counts as one line of therapy). There is no limit on prior number of lines of endocrine therapy. Prior treatment with CDK4/6, AKT, PI3K and/or mTOR inhibitors is permitted.
   • Population 2: Pathologically confirmed ER positive and HER2 negative locoregional or metastatic breast adenocarcinoma that is not amenable to resection, with progression on at least one line of prior endocrine therapy in the adjuvant or metastatic setting and starting next line of therapy that will include endocrine therapy, such as tamoxifen, fulvestrant, aromatase inhibitor, or elacestrant with or without ovarian suppression.
   • Population 3: Study Participants with pathologically confirmed, estrogen and/or progesterone receptor (ER and/or PR) positive and HER2 negative breast adenocarcinoma who are ineligible for Population 1 or 2.
2. At least one target or non-target lesion per RECIST 1.1

3. Male or non-pregnant, non-lactating female Study Participant age ≥18 years. Female Study Participant of child-bearing potential and male Study Participant (if sexually active) must agree to use adequate method(s) of effective contraception during their participation in the study.

   1. Medically acceptable adequate contraception for sexually active females with child-bearing potential include: 1) surgical sterilization (such as tubal ligation or hysterectomy), 2) approved hormonal contraceptives, 3) barrier method (such as condom or diaphragm) used with a spermicide, or 4) intrauterine device (IUD).
   2. Medically acceptable adequate contraception for sexually active males include: 1) surgical sterilization (such as vasectomy), 2) a condom used with a spermicide.
4. Eastern Cooperative Oncology Group (ECOG) Performance Status ≤2.

5. Adequate hepatic function as defined below (within 28 days of dosing with 68Ga R10602):

   1. Serum alanine aminotransaminase (ALT)/ aspartate aminotransaminase (AST) ≤3 × upper limit of normal (ULN) or ≤5 × ULN if liver metastases are present, and
   2. Serum bilirubin: total ≤1.5 × ULN (unless due to Gilbert's syndrome or hemolysis in which case total ≤3.0 × ULN).
6. Adequate renal function as measured by creatinine clearance calculated by the Cockcroft-Gault formula (≥60 mL/minute), determined within 28 days of dosing with 68Ga-R10602.
7. Able to understand and willing to sign an informed consent form (ICF).

Exclusion Criteria:

1. Received a radionuclide within a period of less than 10 physical half-lives of the administered radionuclide prior to dosing with 68Ga-R10602.
2. Radiotherapy ≤14 days prior to dosing with 68Ga-R10602.
3. Major surgery ≤21 days prior to dosing with 68Ga-R10602 or has not recovered from adverse effects of such procedure.
4. Severe or unstable medical condition, such as congestive heart failure (New York Heart Association [NYHA] Class III or IV), ischemic heart disease, uncontrolled hypertension, uncontrolled diabetes mellitus, as well as an uncontrolled cardiac arrhythmia requiring medication (≥Grade 2, according to NCI-CTCAE Version 5.0), myocardial infarction within 6 months prior to starting Investigational Product, or any other significant or unstable concurrent cardiac illness. Note: Stable chronic atrial fibrillation is allowed.
5. History of cerebrovascular accident within 6 months or that resulted in ongoing neurologic instability.
6. Major active infection requiring antibiotics.
7. Known active human immunodeficiency virus infection or active infection with Hepatitis B or C.
8. Acute illness within 14 days prior to dosing with 68Ga-R10602 unless mild in severity, as assessed by the Investigator.
9. Any other condition that in the opinion of the Investigator would place the Study Participant at an unacceptable risk or cause the Study Participant to be unlikely to fully participate or comply with study procedures.

Study Plan

How is the study designed?

Design Details

• Primary Purpose: Diagnostic
• Allocation: Non-Randomized
• Interventional Model: Sequential Assignment
• Masking: None (Open Label)

Number of Arms

2

Arms and Interventions

Participant Group / Arm	Intervention / Treatment
Other: 68Ga-R10602 Imaging Optimization Portion (Cohort 1); 68Ga-R10602 injection at pre-defined dose levels. PET/CT imaging at pre-defined timepoints.	Drug: 68Ga-R10602 injection; 68Ga-R10602 is a gallium-labeled small molecule radioligand that is designed to localize tumor lesions in hormone receptor positive breast cancer
Other: 68Ga-R10602 Imaging Confirmation Portion (Cohort 2); 68Ga-R10602 injection at the selected dose level. PET/CT imaging at a single timepoint.	Drug: 68Ga-R10602 injection; 68Ga-R10602 is a gallium-labeled small molecule radioligand that is designed to localize tumor lesions in hormone receptor positive breast cancer

What is the study measuring?

Primary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Incidence of adverse events	Number of participants with adverse events as assessed by NCI-CTCAE v5.0, including grade	Day 1 to Day 7
Incidence of Serious Adverse Events	Number of participants with serious adverse events	Day 1 to Day 7
Incidence of Clinically Significant Lab Changes	Number of participants with clinically significant change in clinical laboratory parameters	Day 1 to Day 7

Secondary Outcome Measures

Outcome Measure	Measure Description	Time Frame
Number and location of tumors identified by 68Ga-R10602 PET/CT	Number of tumors identified by 68Ga-PET/CT per participant	1 day
Number and location of tumors identified by 68Ga-R10602 PET/CT	Location of tumors identified by 68Ga-10602 PET/CT per participants	1 Day
Number and location of tumors identified by 68Ga-R10602 PET/CT	SUV max of tumor lesions per participant	1 Day
Number and location of tumors identified by 68Ga-R10602 PET/CT	Ratio of tumor SUV over reference regions SUV	1 Day
Number and location of tumor lesions identified by 68Ga-R10602 PET/CT versus standard of care imaging	Number and location of tumor lesions identified by 68Ga-R10602 PET/CT and by standard of care imaging (e.g. contrast enhanced diagnostic CT) and concordance rate between 68Ga-R10602 PET/CT and standard of care images.	1 day
Image quality	Image quality as assessed by a 5-point Likert scale by central review	1 day
Absorbed dose coefficients and total body effective dose	Absorbed dose coefficients (milliGray [mGy]/megabecquerel [MBq]) in organs.	1 day
Absorbed dose coefficients and total body effective dose	The total body effective dose (milliSievert [mSv]/MBq).	1 Day
PK parameters	PK parameters, including Cmax	1 day
PK parameters	PK parameters including area under the curve (AUC).	1 Day
PK parameters	PK parameters including half-life (T1/2) in blood samples.	1 Day
PK parameters	Other pharmacokinetic (PK) parameters may also be evaluated as needed to support the outcome measure.	1 Day

Collaborators and Investigators

• Sponsor: Radionetics Oncology

Study record dates

Study Major Dates

• Study Start (Actual): December 10, 2024
• Primary Completion (Estimated): July 1, 2026
• Study Completion (Estimated): July 1, 2026

Study Registration Dates

• First Submitted: December 9, 2024
• First Submitted That Met QC Criteria: December 17, 2024
• First Posted (Actual): December 20, 2024

Study Record Updates

• Last Update Posted (Actual): March 13, 2026
• Last Update Submitted That Met QC Criteria: March 11, 2026
• Last Verified: March 1, 2026

More Information

Terms related to this study

• Keywords: Hormone Receptor Positive Breast Cancer; Endocrine resistant; Radioisotope
• Additional Relevant MeSH Terms: Neoplasms by Site; Neoplasms; Skin Diseases; Breast Diseases; Breast Neoplasms
• Other Study ID Numbers: R10602-101

Plan for Individual participant data (IPD)

• Plan to Share Individual Participant Data (IPD)?: NO

Drug and device information, study documents

• Studies a U.S. FDA-regulated drug product: Yes
• Studies a U.S. FDA-regulated device product: No
• product manufactured in and exported from the U.S.: No