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1.
Rev Esp Med Nucl ; 21(1): 17-23, 2002 Feb.
Article in Spanish | MEDLINE | ID: mdl-11820997

ABSTRACT

A pilot study was carried out in the Nuclear Medicine Department of the National Institute of Oncology and Radiobiology to learn the diagnostic efficacy of the 99mTc-HMPAO scintigraphy in the detection of cutaneous melanoma, distant and local metastases, in patients with a confirmed histological diagnosis. The planar and/or SPECT scintigraphy was performed in 17 patients and revealed 90% sensitivity for the detection of the disease. We calculated the tumor/background index in all the images obtained and found a value greater than 1 in every case. Thus, we can affirm that the 99mTc-HMPAO accumulation in tumors was higher than the background in all cases. We recommend that this procedure be considered in the follow up of these patients as a new diagnostic method which is very useful in the determination of the patient stage and prognostic evaluation.


Subject(s)
Melanoma/diagnostic imaging , Neoplasm Metastasis/diagnostic imaging , Neoplasm Recurrence, Local/diagnostic imaging , Radiopharmaceuticals , Skin Neoplasms/diagnostic imaging , Technetium Tc 99m Exametazime , Tomography, Emission-Computed, Single-Photon , Adult , Aged , Aged, 80 and over , False Negative Reactions , False Positive Reactions , Female , Follow-Up Studies , Humans , Male , Melanoma/pathology , Melanoma/surgery , Middle Aged , Pilot Projects , Sensitivity and Specificity , Skin Neoplasms/pathology , Skin Neoplasms/surgery
2.
Rev Esp Med Nucl ; 17(2): 82-8, 1998.
Article in Spanish | MEDLINE | ID: mdl-9611277

ABSTRACT

A new Monoclonal Antibody (AcMo) ior-C5, highly specific for the most part of colorectal adenocarcinomas has been developed. The AcMo was labeled with 99mTc by the Schwarz's direct method using molar ratios MAb: reductant of 1:1,000 and 1:2,000. The first molar ratio was the most adequate for the preparation of the radiopharmaceutical. A labeling yield greater than 95% was obtained. Several <> assays were carried out in order to evaluate the stability of the preparation, whose results reflected the presence of the stable complex 99mTc-IgG. The biodistribution patterns for both preparations were similar. The excreting organs behaved like normal. Nevertheless, a greater renal excretion was observed for the preparation of the molar ratio of 1:2.000, which could be due to the presence of low affinity sites observed in this preparation. They are vulnerable to the trans-chelation of the 99mTc toward cysteine or glutathione present in plasma and tissues.


Subject(s)
Adenocarcinoma/diagnostic imaging , Antibodies, Monoclonal , Colorectal Neoplasms/diagnostic imaging , Immunoconjugates , Radioimmunodetection , Radiopharmaceuticals , Technetium , Animals , Antibodies, Monoclonal/pharmacokinetics , Blood Proteins/metabolism , Cysteine/chemistry , Drug Stability , Humans , Immunoconjugates/chemistry , Immunoconjugates/pharmacokinetics , Kidney/metabolism , Male , Mercaptoethanol/pharmacology , Mice , Mice, Inbred BALB C , Oxidation-Reduction , Radiopharmaceuticals/pharmacokinetics , Reducing Agents/pharmacology , Technetium/pharmacokinetics , Tissue Distribution
3.
Rev. cuba. cir ; 22(1): 40-43, ene.- feb. 1983. tab
Article in Spanish | CUMED | ID: cum-8750

ABSTRACT

Se realizó un estudio comparativo en 106 pacientes con tumor maligno primitivo conocido, entre la tomografía hepática de emisión y la ecografía, y esta última tuvo una sensibilidad, especificidad y exactitud discretamente más elevada. Son analizadas las causas que motivaron errores en el diagnóstico. Se concluye que ambas técnicas se complementan, no se excluyen (AU)


Subject(s)
Tomography, Emission-Computed , Liver Neoplasms/diagnosis , Ultrasonography
4.
Rev. cuba. cir ; 21(6): 595-604, nov. - dic. 1982. tab
Article in Spanish | CUMED | ID: cum-8735

ABSTRACT

Se realiza el estudio de 504 pacientes con nódulos de la tiroides, diagnosticándose 66 cánceres del tiroides (13,1 porciento). No se obtienen diferencias marcadas en la incidencia de neoplasia maligna entre ambos sexos. El resultado gammagráfico más frecuente fue el nódulo "frio" con 224 nódulos, de ellos 43 cánceres (19,2 porciento). Cuando el nódulo "frio" fue intrínseco la positividad del mismo aumentó al 32, 0 porciento. La mayor incidencia del nódulo fue en los polos inferiores, ofreciendo el polo inferior derecho un porciento de malignidad mayor que el resto de las localizaciones (AU)


Subject(s)
Thyroid Diseases , Thyroid Neoplasms
5.
Rev. cuba. cir ; 17(1): 51-60, ene.-feb. 1978. ilus, tab
Article in Spanish | CUMED | ID: cum-15335

ABSTRACT

Se presentan los resultados obtenidos en el Instituto Nacional de Oncología y Radiobiología, Ciudad de la Habana, Cuba, en el estudio de pacientes con afecciones cerebrales expansivas primitivas o metastásicas. Se obtuvo un 87,4 por ciento de lesiones supratentoriales positivas en sus pacientes. Se comentan y discuten los resultados obtenidos y se comparan con los de otros autores. Por último se expresa que la gammagrafía cerebral es de gran utilidad en el diagnóstico onconeurológico para decidir la conducta terapéutica a seguir en cada situación específica (AU)


Subject(s)
Radionuclide Imaging
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