A rare case of synchronous appendiceal and cecal cancer.

Primary appendiceal cancer is rare, and difficult to diagnose pre-operatively because lack of specific symptoms. This report presents a rare case of synchronous colon and appendiceal cancer. A 50-year-old man was referred to our hospital due to endoscopic submucosal resection (ESD) for early cecal cancer. ESD was performed, and the pathological examination revealed tubular adenocarcinoma with deep submucosal invasion. Laparoscopic ileocecal resection was performed as additional resection after ESD of cecal cancer. There were no obvious abnormalities around the ileocecal region in the preoperative examination. Postoperative pathological examination incidentally revealed a mucosal papillary adenocarcinoma of the appendix, with no residual lesion in the ESD scar. The patient was discharged on the seventh postoperative day. Synchronous appendiceal and colon cancer is extremely rare in past reports. Here, we report the case details and review previous case reports.

Non-label homogeneous protein detection based on laser interferometric photo-thermal displacement measurement using aptamers.

Photo-thermal displacement measurement by laser interferometry involves the measurement of temperature change caused by illumination of the sample. To develop a system of detecting unlabeled homogeneous proteins based on laser interferometric measurement of photo-thermal displacement, we studied the interaction between aptamers and their target molecules by using thrombin and the thrombin aptamer as a model target and ligand, respectively. Because of the energy consumed by aptamer-thrombin interactions, the signals obtained from solutions containing aptamer-thrombin mixtures varied depending on the thrombin concentration. We propose that this method involving the use of aptamers and photo-thermal displacement measurement will provide a biomolecular detection system for rapid diagnosis.