68Ga-DOTATOC Radio-Guided Surgery With β-Probe in GEP-NET

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68Ga-DOTATOC Radio-Guided Surgery With β-Probe in GEP-NET

Study Purpose

In gastro-entero-pancreatic neuroendocrine tumors (GEP-NETs), radical surgery provides good long-term outcome and low recurrence rates. In GEP-NETs the actual surgical planning is established on the ground of preoperative morphology images (CT scan), and functional imaging using CT/PET with 68Ga-DOTA-TOC, since the high expression of somatostatin receptors (SSR) of these tumors. RGS in GEP-NETs, mainly with gamma-probes, has been not widely accepted since the low rates of sensitivity and, in particular, specificity, in discriminating tumoral/ non tumoral tissue and background ratio. This is a relevant issue in particular in detecting metastatic lymph-nodes both for small-intestine neuroendocrine tumors (SI-NETs) and pancreatic neuroendocrine tumors (Pan-NETs), where the presence of lymph-node metastases has been associated with worse long-term outcome. At present, it is not possible to distinguish whether a small lymph-node is site of metastases or not without performing frozen sections. In a previous study ex-vivo from European Institute of Oncology SI-NET presented a high uptake of a beta-emitting radiotracer, 90Y-DOTA-TOC. Five SI-NET showing SSR positivity at PET with 68Ga DOTA-TOC received 5 mCi of 90Y-DOTA-TOC the day before surgery. All the tumor samples showed high counts of radioactivity with a sensitivity of 96% and a specificity of 100%. These results allowed the investigators to develop a probe, which is now approved for in-vivo employment within the operating theatre. The objective of the present study is to verify in-vivo within the abdominal cavity the capability of the probe to detect 68-Ga activity within tumoral tissue thus favouring radical surgery and avoiding unnecessary demolition, in the near future. However, in the present protocol the entity of surgery will not be modified by intraoperative findings of the probe. It is reasonable to assume that results from 68Ga-DOTA-TOC might be comparable to 90Y-DOTA-TOC as radiotracer, and the detection efficacy of the probe for 68Ga could be not inferior compared to the isotope 90Y. However, while 90Y-DOTA-TOC is used as investigational drug for therapy purposes only within clinical research protocol, 68Ga-DOTA-TOC is a diagnostic radiotracer broadly used in day-to-day clinical practice since many years. Furthermore, the administration of 68Ga-DOTA-TOC can be directly injected in surgery room and thus does not require patients' admission the day before surgery.

Recruitment Criteria

Accepts Healthy Volunteers Healthy volunteers are participants who do not have a disease or condition, or related conditions or symptoms	No
Study Type An interventional clinical study is where participants are assigned to receive one or more interventions (or no intervention) so that researchers can evaluate the effects of the interventions on biomedical or health-related outcomes. An observational clinical study is where participants identified as belonging to study groups are assessed for biomedical or health outcomes. Searching Both is inclusive of interventional and observational studies.	Observational
Eligible Ages	18 Years and Over
Gender	All

More Inclusion & Exclusion Criteria

Inclusion Criteria:

- Histologically proven GEP-NET.

- Patients undergoing primary tumor and/or lymph-node dissection after discussion at IEO NET tumor board.

- 68Ga-DOTA-TOC PET/CT performed within 12 weeks prior to surgery.

- DOTA-TOC positive tumors 68Ga-DOTA-TOC PET/CT.

- Age >18 years old.

- Willing to sign informed consent.

Exclusion Criteria:

- Patient unfit for surgery.

- Patients negative to 68Ga-DOTA-TOC PET/CT.

- Unable to tolerate PET scan

Trial Details

Trial ID: This trial id was obtained from ClinicalTrials.gov, a service of the U.S. National Institutes of Health, providing information on publicly and privately supported clinical studies of human participants with locations in all 50 States and in 196 countries.	NCT05448157
Phase Phase 1: Studies that emphasize safety and how the drug is metabolized and excreted in humans. Phase 2: Studies that gather preliminary data on effectiveness (whether the drug works in people who have a certain disease or condition) and additional safety data. Phase 3: Studies that gather more information about safety and effectiveness by studying different populations and different dosages and by using the drug in combination with other drugs. Phase 4: Studies occurring after FDA has approved a drug for marketing, efficacy, or optimal use.
Lead Sponsor The sponsor is the organization or person who oversees the clinical study and is responsible for analyzing the study data.	European Institute of Oncology
Principal Investigator The person who is responsible for the scientific and technical direction of the entire clinical study.	Emilio Bertani
Principal Investigator Affiliation	IRCCS Istituto Europeo di Oncologia S.r.l.
Agency Class Category of organization(s) involved as sponsor (and collaborator) supporting the trial.	Other
Overall Status	Active, not recruiting
Countries	Italy
Conditions The disease, disorder, syndrome, illness, or injury that is being studied.	Neuroendocrine Tumor Carcinoid, Neuroendocrine Tumor of Pancreas, Gep Net

Additional Details

Radical surgery is one of the most important way of treatment for solid tumors. In gastro-entero-pancreatic neuroendocrine tumors (GEP-NETs), it provides good long-term outcome and low recurrence rates. For breast cancer radio-guided surgery (RGS), using gamma radiations, is a well standardised methods because it aids to remove non-palpable lesions. In GEP-NETs the actual surgical planning is established on the ground of preoperative morphology images (CT scan), and functional imaging using CT/PET with 68Ga-DOTA-TOC, since the high expression of somatostatin receptors (SSR) of these tumors. RGS in GEP-NETs, mainly with gamma-probes, has been not widely accepted since the low rates of sensitivity and, in particular, specificity, in discriminating tumoral/ non tumoral tissue and background ratio. This is a relevant issue in particular in detecting metastatic lymph-nodes both for small-intestine neuroendocrine tumors (SI-NETs) and pancreatic neuroendocrine tumors (Pan-NETs), where the presence of lymph-node metastases has been associated with worse long-term outcome. At present, it is not possible to distinguish whether a small lymph-node is site of metastases or not without performing frozen sections. In a previous study ex-vivo from our Institute SI-NET presented a high uptake of a beta-emitting radiotracer, 90Y-DOTA-TOC. Five SI-NET showing SSR positivity at PET with 68Ga DOTA-TOC received 5 mCi of 90Y-DOTA-TOC the day before surgery. All the tumor samples showed high counts of radioactivity with a sensitivity of 96% and a specificity of 100%. These results allowed us to develop a probe, which is now approved for in-vivo employment within the operating theatre. The objective of this study is to verify in-vivo within the abdominal cavity the capability of the probe to detect 68-Ga activity within tumoral tissue thus favouring radical surgery and avoiding unnecessary demolition, in the near future. However, in the present protocol the entity of surgery will not be modified by intraoperative findings of the probe. It is reasonable to assume that results from 68Ga-DOTA-TOC might be comparable to 90Y-DOTA-TOC as radiotracer, and the detection efficacy of the probe for 68Ga could be not inferior compared to the isotope 90Y. However, while 90Y-DOTA-TOC is used as investigational drug for therapy purposes only within clinical research protocol, 68Ga-DOTA-TOC is a diagnostic radiotracer broadly used in day-to-day clinical practice since many years. Furthermore, the administration of 68Ga-DOTA-TOC can be directly injected in surgery room and thus does not require patients' admission the day before surgery. The Primary objectives are to evaluate the diagnostic accuracy of the combined approach with β-probe and 68Ga-68 DOTA-TOC PET/CT in the correct identification of primary tumor and lymph-node metastases, patients with gastro-entero-pancreatic neuroendocrine tumors (GEP-NET) undergoing surgery. The histopathological analysis of the surgical specimens will be considered the standard of reference and diagnostic accuracy will be evaluated in terms of sensitivity and specificity. The secondary objectives are:

- the identification of the most appropriate tumor-to-background ratio (TBR) able to correctly locate the signal emitted by DOTA-TOC-positive tumors or lymph nodes compared with the signal derived by the background rumor.

- safety and toxicity analysis regarding the intraoperative application of the β-probe.

- the comparison between the signal detected by the β-probe and 68Ga-DOTA-TOC PET/CT images.

- the correlation of the signal detected by the β-probe with the DOTA-TOC expression (DOTA-TOC staining) in tumors AND lymph node metastases assessed by immuno-histochemical analysis on the surgical specimens.

The pathology assessment will be assessed with Immune-histo-chemical (IHC) analysis performed on surgical specimens obtained during surgery to assess the presence of neuroendocrine tumor localizations

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