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Combination External Radiation and PRRT for Large GI Neuroendocrine Tumors.

Combination External Radiation and 177Lu-DOTATATE for Large Gastrointestinal Neuroendocrine Tumors: A Single Arm Pilot Clinical Trial

Who can join

Ages 18 and older · All sexes

Inclusion Criteria:

* Male or female
* Age ≥ 18 years
* Patient must be able to provide study specific informed consent
* Pathologically confirmed neuroendocrine tumor fulfilling all of the following criteria
* Well-differentiated, grade 1-2
* Unresectable (prior resection is allowable), verified by tumor board or surgical oncology (surg onc)
* Progression after one or two prior lines of systemic therapy
* Somatostatin-receptor positive disease as determined by positive radiotracer-labeled DOTATATE PET/CT scan (modified Krenning score 3+)
* One or more large lesions measuring 3 or more cm on contrast-enhanced CT or MRI
* Eastern Cooperative Oncology Group (ECOG) performance status 0-2
* Estimated glomerular filtration rate (GFR) \> 30 mL/min (within 90 days prior to study registration)
* Total bilirubin ≤ 3 x upper limit of normal (within 90 days prior to study registration)
* Albumin \> 30 g/L (within 90 days prior to study registration)
* White blood cell (WBC) ≥ 2,000 cells/mm\^3 (within 90 days prior to study registration)
* Platelets ≥ 70000 cells/mm\^3 (within 90 days prior to study registration)
* Hemoglobin ≥ 8.0 g/dl (Note: The use of transfusion or other intervention to achieve hemoglobin \[Hgb\] ≥ 8.0 g/dl is acceptable.) (within 90 days prior to study registration)

Exclusion Criteria:

* Any prior radiation therapy including prior PRRT, external radiation, or Yttrium-90 radioembolization to the same site/region
* Contraindications to radiation therapy including inflammatory bowel disease, systemic sclerosis, etc.
* Brain metastases or any metastases extending into the spinal canal
* Unable to obtain confirmation of payment coverage for any planned radiation treatment

About the study

This phase I trial tests the safety and effectiveness of stereotactic body radiation therapy (SBRT) followed by 177Lu-DOTATATE peptide receptor radionuclide therapy (PRRT) in treating patients with large well-differentiated grade 1-2 digestive system neuroendocrine tumors that cannot be removed by surgery (unresectable). SBRT is a type of external radiation therapy that uses special equipment to position a patient and precisely deliver radiation to tumors in the body. The total dose of radiation is divided into smaller doses given over several days. This type of radiation therapy helps spare normal tissue. 177Lu-DOTATATE is a radioactive drug. It binds to a protein called somatostatin receptor, which is found on some neuroendocrine tumor cells. 177Lu-DOTATATE builds up in these cells and gives off radiation that may kill them. It is a type of radioconjugate and a type of somatostatin analog. Giving PRRT after SBRT may reduce the chances of the disease returning or getting worse, compared to the standard treatment of PRRT alone.

What is being tested

• Stereotactic Body Radiation Therapy (radiation)
• Lutetium Lu 177 Dotatate (drug)
• Computed Tomography (procedure)
• Magnetic Resonance Imaging (procedure)
• Gallium Ga 68-DOTATATE (radiation)
• Positron Emission Tomography (procedure)

Sponsor: Emory University · Participants: 15 · Started: Oct 14, 2025

Contact the study team

• Pretesh Patel, MD · Phone: 404-778-3473

Official record on ClinicalTrials.gov — NCT07150546

Locations in the U.S.

Conditions

• Gastro-enteropancreatic neuroendocrine tumor

From ClinicalTrials.gov, data retrieved Oct 2, 2026. Each study sets its own eligibility; the study team decides who can join.