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

NCT ID: NCT05448157

Last Updated: 2023-09-22

Basic Information

• Recruitment Status: UNKNOWN
• Total Enrollment: 20 participants
• Study Classification: OBSERVATIONAL
• Study Start Date: 2022-05-12
• Study Completion Date: 2023-12-12

Brief Summary

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.

Detailed Description

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

Conditions

Neuroendocrine Tumor Carcinoid; Neuroendocrine Tumor of Pancreas; Gep Net

Study Design

• Observational Model Type: OTHER
• Study Time Perspective: PROSPECTIVE

Eligibility 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

• Minimum Eligible Age: 18 Years
• Eligible Sex: ALL
• Accepts Healthy Volunteers: No

Sponsors

European Institute of Oncology

OTHER

Sponsor Role: lead

Responsible Party

Emilo Bertani

Director - surgeon

Responsibility Role: PRINCIPAL_INVESTIGATOR

Principal Investigators

Emilio Bertani

Role: PRINCIPAL_INVESTIGATOR

IRCCS Istituto Europeo di Oncologia S.r.l.

Locations

IRCCS Istituto Europeo di Oncologia S.r.l.

Milan, , Italy

Countries

Italy

References

Bertani E, Mattana F, Collamati F, Ferrari ME, Bagnardi V, Frassoni S, Pisa E, Mirabelli R, Morganti S, Fazio N, Fumagalli Romario U, Ceci F. Radio-Guided Surgery with a New-Generation beta-Probe for Radiolabeled Somatostatin Analog, in Patients with Small Intestinal Neuroendocrine Tumors. Ann Surg Oncol. 2024 Jul;31(7):4189-4196. doi: 10.1245/s10434-024-15277-x. Epub 2024 Apr 23.

Reference Type: DERIVED

PMID: 38652200 (View on PubMed)

Other Identifiers

IEO 1740

Identifier Type: -

Identifier Source: org_study_id