Efficacy of endoscopic papillectomy for tumors of major duodenal papilla and literature review / 中国内镜杂志

Objective To evaluate and analyze the efficacy and safety of endoscopic papillectomy for tumors of major duodenal papilla. Methods The clinical data of three patients with tumors of major duodenal papilla who were treated by endoscopic papillectomy were retrospectively reviewed, and the clinical outcome was summarized. Results The success rate of endoscopic papillectomy was 100.0% (3/3), and the complete resection was 100.0% (3/3). No short-term complication occurred in 3 cases. The recurrence rate was 0.0% (0/3). Conclusion Endoscopic papillectomy is an effective method for treating tumors of major duodenal papilla.

Radiosynthesis of peripheral benzodiazepine receptor radioligand N-methyl-(11)CPK 11195 as an imaging agent for positron emission tomography / 南方医科大学学报

<p><b>OBJECTIVE</b>To establish a protocol of automated synthesis of 1-(2-chlorophenyl)-N-[(11)C]methyl-N-(1-methylpropyl)-3-isoquinoline carboxamide ((11)C-PK11195) as the positron-emitter-labeled ligand for peripheral benzodiazepine receptor (PBR) using a commercial synthesizer and explore the quality control methods for the resulting product.</p><p><b>METHODS</b>(11)C-methyl iodide ((11)C-CH(3)I) was synthesized via liquid-phase distillation approach using a (11)C-iodomethane synthesizer. (11)C-PK11195 was prepared by (11)C-methylation of 1-(2-chlorophenyl)-N-(1-methylpropyl)-3-isoquinoline carboxamide (N-demethyl-PK 11195) as the precursor with (11)C-CH(3)I and purified by semi-preparative reversed phase high performance liquid chromatography (HPLC). The radiochemical purity, chemical purity and stability of the product were evaluated by HPLC, and the toxicity was assessed in normal mice. The factors that affected (11)C-PK11195 synthesis were also studied.</p><p><b>RESULTS</b>(11)C-PK11195 was successfully synthesized using the TracerLab FX(F-N) synthesizer. The synthesis time was about 35 min from the end of (11)C-carbon dioxide production by cyclotron to the end of (11)C-PK11195 synthesis (EOS), with a (11)C-methylation reaction time of 3-4 min. The uncorrected radiochemical yield for (11)C-methylation was (33-/+5)%. Analysis with radio-analytical HPLC showed a radiochemical purity and chemical purity of the product both exceeding 99%, with a specific radioactivity of 30-65 GBq/micromol at EOS (from the end of radionuclide production). The (11)C-PK11195 synthesized was radiochemically stable at room temperature and showed low toxicity in normal mice.</p><p><b>CONCLUSION</b>The (11)C-PK11195 injection can be conveniently prepared using an automated synthesizer for clinical use in positron emission tomography.</p>