Recruiting
Phase 2

177Lu-DOTATATE

Sponsor:

OHSU Knight Cancer Institute

Code:

NCT04529044

Conditions

Anatomic Stage IV Breast Cancer AJCC v8

Metastatic Breast Carcinoma

Recurrent Breast Carcinoma

Eligibility Criteria

Sex: All

Age: 18 - 70+

Healthy Volunteers: Not accepted

Interventions

Biopsy

Biospecimen Collection

Computed Tomography

Gallium Ga 68-DOTATATE

Lutetium Lu 177 Dotatate

Study Details

Brief summary:

This phase II trial investigates how well 177Lu-DOTATATE works in treating patients with breast cancer that is stage IV or has come back (recurrent). 177Lu-DOTATATE may shrink or destroy the tumor or circulating breast cancer stem cells if they show evidence of the SSTR2. 177Lu-DOTATATE is a targeted therapy that uses DOTATATE, linked to a radioactive agent called 177Lu. DOTATATE attaches to tumor cells with SSTR2 and delivers 177Lu to kill them. Giving 177Lu-DOTATATE may help decrease the number and size of tumors and the number of circulating cancer stem cells in patient's blood for the treatment of patients with breast cancer positive for SSTR2.

Conditions

Anatomic Stage IV Breast Cancer AJCC v8

Metastatic Breast Carcinoma

Recurrent Breast Carcinoma

Study ID

NCT04529044

Start date

Jun 30, 2026

Status verified date

Jun, 2026

Completion date

Dec 20, 2027

Anticipated

Primary completion date

Dec 20, 2027

Anticipated

Eligibility Criteria

Eligibility Criteria

Sex: All

Age: 18 - 70+

Healthy Volunteers: Not accepted

Inclusion Criteria:

  • Life expectancy of > 6 months, as determined by the investigator
  • Ability to understand and the willingness to sign a written informed consent document
  • Patients aged >= 18-100 years old at time of informed consent
  • Histologically or cytologically confirmed metastatic breast carcinoma
  • Stage IV or recurrent disease with distant metastases
  • Female and male patients with breast cancer will be included in the study
  • Participants must have experienced disease progression after at least two lines of standard treatment modalities and/or one prior line of cytotoxic chemotherapy (not just endocrine therapy). Specifically, patients must have received or declined the following therapies: a) Hormone receptor positive (HR+)/HER2: endocrine therapy and CDK4/6 inhibitor (i); b) HER2+: trastuzumab, pertuzumab, T-DM1 and tucatinib; c) Triple negative breast cancer (TNBC): chemotherapy, immunotherapy (in PD-L1+ tumors). Patients can be consented if they are foregoing treatments known to confer survival advantage
  • Participants must have at least one measurable site of disease as defined by Response Evaluation Criteria in Solid Tumors (RECIST) version (v1).1 that is amendable to biopsy
  • Confirmed presence of SSTR based on > 50% of lesions with DOTATATE uptake of 68Ga DOTATATE equivalent to the liver
  • Participants must have fully recovered from the acute toxic effects of all prior treatment to grade 1 or less, except alopecia and =< grade 2 neuropathy which are allowed
  • Participant must have Eastern Cooperative Oncology Group (ECOG) performance status =< 2
  • Participant must consent to undergo a pre-treatment screening biopsy for enrollment
  • Hemoglobin >= 8.0 g/dL with no blood transfusion in the past 28 days (measured within 28 days prior to administration of study treatment)
  • Absolute neutrophil count (ANC) >= 2.0 x 10\^9/L (measured within 28 days prior to administration of study treatment)
  • Platelet count >= 75 x 10\^9/L (measured within 28 days prior to administration of study treatment)
  • Total bilirubin =< 3 x institutional upper limit of normal (ULN) (measured within 28 days prior to administration of study treatment)
  • Aspartate aminotransferase (AST)/alanine aminotransferase (ALT) =< 2.5 x institutional upper limit of normal (unless liver metastases are present in which case they must be =< 5 x ULN) (measured within 28 days prior to administration of study treatment)
  • Serum albumin >= 3.0 g/L, unless prothrombin time or international normalized ratio (INR) value is within the normal range (measured within 28 days prior to administration of study treatment)
  • Participants must have serum creatinine =< 1.7 mg/dL, or creatinine clearance estimated of >= 51 mL/min using the Cockcroft-Gault equation or based on a 24 hour urine test (measured within 28 days prior to administration of study treatment)
  • Female participants of childbearing potential (FOCBP) must have a negative urine or serum pregnancy test within 72 hours prior to receiving the first dose of study medication. If the urine test is positive or cannot be confirmed as negative, a serum pregnancy test will be required
  • FOCBP agree to use a highly-effective method of contraception starting with the first dose of study therapy up to 7 months after the last dose of study therapy

  • FOCBP are those who are not proven postmenopausal. Postmenopausal is defined as:

  • Amenorrheic for > 24 consecutive months following cessation of exogenous hormonal treatments
  • Luteinizing hormone (LH) and Follicle stimulating hormone (FSH) levels in the post menopausal range for women under 50 years of age
  • Radiation-induced oophorectomy with last menses > 1 year ago
  • Chemotherapy-induced menopause with > 1 year interval since last menses
  • Surgical sterilization (bilateral oophorectomy or hysterectomy or tubal ligation)

Exclusion Criteria:

  • Currently participating and receiving study therapy or has participated in a study of an investigational agent and received study therapy or used an investigational device within 4 weeks of first dose of 177Lu- DOTATATE treatment

  • Individuals in the follow-up phase of a prior investigational study may participate as long as it has been 4 weeks since last dose of the previous investigational agent or device
  • Prior external beam radiation therapy to more than 25% of the bone marrow
  • Other malignancy unless curatively treated with no evidence of disease for >= 5 years except: adequately treated non-melanoma skin cancer or curatively treated in situ cancer of the cervix
  • Known brain metastases, unless these metastases have been treated and stabilized
  • Peptide receptor radionuclide therapy at any time prior to study enrollment
  • Known hypersensitivity to somatostatin analogues or any component of the 68Ga- DOTATATE or 177Lu- DOTATATE formulations
  • Patients with uncontrolled infection will not be enrolled until infection is treated per provider discretion
  • Uncontrolled intercurrent illness including, but not limited to, symptomatic congestive heart failure, unstable angina pectoris, serious cardiac arrhythmia, myocardial infarction within 6 months prior to enrollment, New York Heart Association (NYHA) class III or IV heart failure
  • Uncontrolled diabetes mellitus as defined by a fasting blood glucose > 2x ULN
  • Any patient receiving treatment with short-acting somatostatin analogs, which cannot be interrupted for both 24 hours before and after the administration of 177Lu, or any patient receiving treatment with long-acting release somatostatin analogs that cannot be interrupted for at least 4 weeks before the administration of 177Lu- DOTATATE
  • Any surgery or radiofrequency ablation within 12 weeks prior to enrollment in the study; or prior radioembolization; chemoembolization; or external beam radiation therapy (EBRT) to > 25% of bone marrow, at any time
  • Any chemotherapy or targeted therapy within 4 weeks prior to enrollment in the study
  • Current spontaneous urinary incontinence making impossible the safe administration of the radioactive study agent
  • Any psychiatric illness that prevents patient from informed consent process
  • Any concurrent condition that, in the Investigator's opinion, would jeopardize the safety of the patient or compliance with the protocol
  • Participant is pregnant or breastfeeding, or expecting to conceive within the projected duration of the trial, starting with the screening visit through 6 months after the last dose of trial treatment

Study Design

Enrollment

10 participants

Anticipated

Intervention Model

Single group

Primary purpose

Treatment

Interventions and Outcome Measures

Arms

experimental: Treatment (177Lu-DOTATATE)

Patients receive 177Lu-DOTATATE IV over 30-40 minutes during weeks 1, 8, 16, and 24 in the absence of disease progression or unacceptable toxicity. Patients also receive Ga 68-DOTATATE and undergo PET/CT during screening, biopsy as clinically-indicated as well as CT and/or MRI and collection of blood samples throughout the study.

Interventions

Biopsy

Undergo biopsy

Biospecimen Collection

Undergo collection of blood samples

Computed Tomography

Undergo PET/CT

Gallium Ga 68-DOTATATE

Receive 68Ga

Lutetium Lu 177 Dotatate

Given IV

Positron Emission Tomography

Undergo PET/CT

Primary outcome measure

  • Objective response rate (ORR) [ Time Frame: Up to 3 months post-therapy ]

Central Contacts and Locations

Central contacts

Kaiya R Kozuma

7024672457kozuma@ohsu.edu

Rodney F Pommier

5034945501pommierr@ohsu.edu

Locations

OHSU Knight Cancer Institute

Recruiting

Portland, Oregon, United States, 97239

Contacts

Rodney Pommier

(503) 494-5501pommierr@ohsu.edu

Principal Investigator:

Rodney Pommier

More Information

Sponsor

OHSU Knight Cancer Institute

Last update posted

Jun 5, 2026

Last verified

Jun, 2026

Trial information was received from ClinicalTrials.gov and was last updated on 2026-09-10. This information was provided to ClinicalTrials.gov by OHSU Knight Cancer Institute on 2026-06-05.