Extensión tumoral intraoperatoria radioguiada en cáncer gastrointestinal con alta expresión de receptor del factor de crecimiento epidérmico / Tumor Extent during Radioguided Surgery in Gastrointestinal Cancer with High Expression of Epidermal Growth Factor Receptor

RESUMEN Con el auge contemporáneo de novedosos paradigmas en las ciencias médicas, como la Medicina personalizada, se busca una resección oncológica más eficaz, con nuevos márgenes quirúrgicos de acuerdo al estadio tumoral. Para alcanzar estos resultados, se abren paso técnicas como la cirugía radioinmunoguiada. En Cuba, los adelantos biotecnológicos han permitido el desarrollo de fármacos líderes en el mundo, como el Nimotuzumab, un anticuerpo monoclonal dirigido contra el receptor del factor de crecimiento epidérmico, sobrexpresado en múltiples tumores malignos de origen epitelial. Al marcarlo con un radioisótopo puede auxiliar al cirujano en la determinación precisa de la extensión tumoral (radioguiada) de estas neoplasias durante el acto quirúrgico(AU)

ABSTRACT The contemporary rise of new paradigms within medical sciences, such as personalized medicine, a more effective oncological resection is pursued, with new surgical margins based on tumor stage. To achieve these outcomes, some techniques, such as radioimmunoguided surgery, are expanding. In Cuba, biotechnological advances have allowed the development of world-leading drugs, such as nimotuzumab, a monoclonal antibody directed against the epidermal growth factor receptor, overexpressed in multiple malignant tumors of epithelial origin. Marking it with a radioisotope can help the surgeon in the precise determination of tumor extent (radioguided) of these malignancies during the surgical act(AU)

Radioimmunoscintigraphy Using (99m)Tc-anti-CEA F(ab')(2) Fragment in Rectal Cancer and a Pilot Study for Radioimmunoguided Surgery / 대한핵의학회잡지

PURPOSE: This prospective study was performed to evaluate the usefulness of preoperative radioimmu-noscintigraphy and intraoperative scintimetric examination (radioimmunoguided surgery: RIGS) using (99m)Tc-anti-CEA F(ab')(2), fragment. MATERIALS AND METHODS: Nineteen patients with rectal cancer underwent preoperative whole body planar scintigraphy at 4 hours after injection of (99m)Tc-anti-CEA F(ab')(2), fragment and SPECT imaging at 18 hours. Surgical operation was performed at 24 hours after injection. During laparotomy, radioactivities from intraabdominal viscera were measured by gamma probe. The radioac-tivities from excised tumor and lymph nodes were also measured and compared with pathology. RESULTS: All nineteen patients were confirmed to have adenocarcinomas in the rectum. Twenty-seven of 97 excised lymph node groups had metastasis and 2 patients had liver metastasis in pathology. Preoperative radioim- munoscintigraphy detected primary tumors in 11 patients (sensitivity 55%) and it couId not detect any lymph nodes or liver metastasis. All patients showed high radioactivity in the kidneys, liver, spleen, and major vessels in intraoperative measurement by gamma probe, and tumor activity was not discriminated from background activity. However, ra4ioactivity from excised tumor was higher than normal rectum (T/B ratio; 3.47+/-2.25). When excised lymph node activity/background activity ratio > 1,5 was considered as positive criteria of metastasis, sensitivity, specificity, positive and negative predictive values were 78.6%, 73.9%, 55.0% and 89.5%, respectively. CONCLUSION: Radioimmunoscintigraphy using (99m)Tc-anti-CEA F(ab')(2). has no additional value for preoperative staging and use of early RIGS using (99m)Tc-anti-CEA F(ab')(2)is inappropriate. For early RIGS using (99m)Tc labeled antibodies in rectal cancer patients, further development of more specific antibodies and methods to reduce background activity are needed.

Application of the Monoclonal Antibody 3H11 Against Gastric Cancer / 中国肿瘤生物治疗杂志

A monoclonal antibody (McAb) 3H11 against gastric cancer with high positive rate, high selectivity and high affinity was obtained. 131 I Labeled McAb 3H11 was injected into gastric cancer-bearing nude mice, and the tumor/liver ratio, localization index, ID%/g could reach 8.26?1.26, 6.08 + 1.51, 11.00?2.62, respectively. Moreover, McAb 3H11 conjugated with 131 I could increase the cytotoxicity to tumor xenografts and decrease the side effects. The radioimmunoimage was carried out in 19 cases with gastric cancer, and positive image was obtained in 16 cases (84.2%). The radioimmunoguided surgery of gastric cancer was successfully done by submucous injection of labeled McAb 3H11 through endoscope. The sensitivity, specificity and accuracy for evaluation of tumor infiltrated gastric walls were 94.6%, 96.7% and 95.9%, respectively. The sensitivity, specificity and accuracy for identification of metastatic lymph nodes were 99.2% ,97.7% and 98.8%, respectively.