succimer and Carcinoid-Tumor

For this study, 24 patients with medullary thyroid cancer (MTC) and 10 with carcinoid-/GEP-tumours underwent scintigraphy with 123I-Tyr3-octreotide or 111In-DTPA-D-Phe1-octreotide (Octreoscan) or 99mTc-V-DMSA. Calcitonin and CEA were elevated in MTC patients, the other had tumour lesions on CT. Octreoscan-scintigraphy was positive in 68% of all suspicious cases. On the other hand, 123I-Tyr3-octreotide showed only rarely positive results. 99mTc-V-DMSA-scans in MTC patients were positive in 23%. Liver metastases could be seen only with Octreoscan in the non-MTC-group. These results showed better sensitivity of 111In-labelled octreotide.

Topics: Adult; Aged; Calcitonin; Carcinoembryonic Antigen; Carcinoid Tumor; Carcinoma, Medullary; False Positive Reactions; Female; Gastrointestinal Neoplasms; Humans; Indium Radioisotopes; Iodine Radioisotopes; Liver Neoplasms; Male; Middle Aged; Octreotide; Organotechnetium Compounds; Pancreatic Neoplasms; Pentetic Acid; Radionuclide Imaging; Receptors, Somatostatin; Sensitivity and Specificity; Succimer; Technetium Tc 99m Dimercaptosuccinic Acid; Thyroid Neoplasms

A primary carcinoid tumor of the thymus showing ectopic ACTH syndrome was evaluated scintigraphically with four radiopharmaceuticals and a fluorescence method. Iodine-123-MIBG and 201Tl-Cl scintigraphy clearly demonstrated the tumor. Gallium-67-citrate and 99mTc(V)-DMSA showed no tumor uptake. The fluorescence method confirmed numerous storage granules of norepinephrine. Iodine-123-MIBG scintigraphy could be useful in the presurgical diagnosis of carcinoid tumors of the thymus.

Topics: 3-Iodobenzylguanidine; Aged; Carcinoid Tumor; Citrates; Citric Acid; Humans; Iodine Radioisotopes; Iodobenzenes; Male; Microscopy, Fluorescence; Organotechnetium Compounds; Radionuclide Imaging; Succimer; Technetium Tc 99m Dimercaptosuccinic Acid; Thallium Radioisotopes; Thymus Gland; Thymus Neoplasms

The aim of this study was to evaluate the effectiveness of a recently developed radiolabelled somatostatin analog (111In-pentetreotide) for the detection and localization of both medullary thyroid carcinoma (MTC) and carcinoid tumors, and to compare the results obtained with the results of 99mTc(V)-DMSA, and radioiodinated MIBG imaging. 111In-pentetreotide scintigraphy was performed in 9 patients with MTC and in 9 patients with carcinoid tumor. Whole body and SPECT studies were performed at 4 and 24 hours post-injection. SMS scintigraphy gave a positive result in 5 out of 7 patients with proven MTC lesions, and in 7 out of 9 patients with known lesions of carcinoid tumor. It gave a negative result in 2 MTC patients with high levels of calcitonin but with no evidence of disease at conventional diagnostic modalities. The scintigraphic results were comparable with those obtained with 99mTc(V)-DMSA in MTC and were superior to those of radioiodinated MIBG in both MTC and carcinoid tumors. When compared with the modifications of calcitonin levels brought about by the acute administration of octreotide ("Octeotride test"), these correlated well in 8 out of 9 patients studied.

Topics: 3-Iodobenzylguanidine; Adult; Aged; Antineoplastic Agents, Hormonal; Calcitonin; Carcinoid Tumor; Carcinoma, Medullary; Female; Follow-Up Studies; Humans; Indium Radioisotopes; Iodine Radioisotopes; Iodobenzenes; Male; Middle Aged; Octreotide; Organotechnetium Compounds; Radiopharmaceuticals; Somatostatin; Succimer; Technetium Tc 99m Dimercaptosuccinic Acid; Thyroid Neoplasms; Tomography, Emission-Computed, Single-Photon