video of scan on small bowel GEP-NETSurgery plays a primary role in the field of cancer treatment. One problem of this treatment is the fact that a high percentage of tumor remains after the operation, since more residual remains, higher is the possibility of regeneration of the tumor.
The radio-guided surgery is a surgical technique developed to help the surgeon to perform a complete tumor resection. The radio-marked tracer is administered to the patient before the surgical operation and it is preferentially taken up by the tumor. During the operation, surgeon can search the residuals using a probe system that detects the tracer. Today it is a standard technique, but it is based on gamma emitting radio tracer (and so gamma probe). The drawback of using photons relies in the gamma’s high penetration power. The consequence of this is a high background from the nearby healthy tissue that have taken up small dose of the tracer. So the gamma probes can be used only for a limited numbers of tumors.
Our idea is to extend this technique to a large number of tumors by using beta minis radio tracers. Electrons have lower penetration power so we can achieve a higher spatial resolution. We have built a first prototype of beta minus probe, and tested it. Two are the points that guided us in the creation of the prototype: dimension and time
The probe must be handled by the surgeon; it must be compact (pen size). Surgeon must use it during operations, so we need an high efficiency in order to detect even small concentrations with low acquisition time. We have created a compact probe using as detector an active volume of para-therphenyl, a material with a very high light yield (30k gamma/MeV) linked by optical fibre to a photomultiplier. We have tested it and with the information acquired we have created different prototypes (crystal dimension and different read-out).
We have identified meningioma as the proof of principle and glioma and GEP-NETs as the first clinical trials to perform. We have performed ex-vivo tests on meningioma patients with the Ist. Neurologico Besta and the IEO of Milan, and we are planning more tests.
In the meanwhile, in collaboration with the Univ. Cattolica del Sacro Cuore, the Istituto Superiore di Sanita' and the Chemical departments of "La Sapienza" we are investigating the use and the development of new radio-tracers.
V. Bocci, F. Collamati, R. Faccini, S. Morganti, A. Pepe, L. Recchia, A. Russomando, E. Solfaroli
- Univ. degli Studi and INFN Perugia, Perugia.
- Dip. Bioingegneria, Milan
- Istituto Neurologico Carlo Besta, Milan
- Istituto Europeo di Oncologia, Milan
- Policlinico Gemelli, Rome
- Arcispedale S.Maria Nuova, Reggio Emilia
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Italian patent application (RM2013A000053) entitled ‘‘Utilizzo di radiazione b- per la identificazione intraoperatoria di residui tumorali e la corrispondente sonda di rivelazione’’
PCT patent application (PCT/IT2014/000025) entitled ‘‘Intraoperative detection of tumor residues using beta- radiation and corresponding probes’’
- Italian patent application (180321AE80) entitles "Radiofarmaco per utilizzo diagnostico terapeutico in medicina nucleare e medicina radioguidata"