A selective and sensitive competitive enzyme-linked immunosorbent assay (ELISA) method was developed and validated for the quantification of erlotinib in 50μL of samples of human serum. Anti-erlotinib serum was obtained by immunizing mice with an antigen conjugated with bovine serum albumin and 3,4-bis(2-methoxyethoxy)benzoic acid using the N-succinimidyl ester method. Enzyme labeling of erlotinib with horseradish peroxidase was similarly performed using 3,4-bis(2-methoxyethoxy)benzoic acid. A simple competitive ELISA for erlotinib was developed using the principle of direct competition between erlotinib and the enzyme marker for anti-erlotinib antibody, which had been immobilized on the plastic surface of a microtiter plate. Serum erlotinib concentrations lower than 40 ng/mL were reproducibly measurable using the ELISA. This ELISA was specific to erlotinib and showed very slight cross-reactivity (6.7％) with a major metabolite, O-desmethyl erlotinib. Using this assay, drug levels were easily measured in the blood of mice after oral administration of erlotinib at a single dose of 30 mg/kg. ELISA should be used as a valuable tool for therapeutic drug monitoring and in pharmacokinetic studies of erlotinib.

Objective: The objective of this study was to validate the Japanese version of the STOP-Bang test for risk assessment of obstructive sleep apnea syndrome (OSAS).Methods: We retrospectively evaluated inpatients who underwent nocturnal pulse oximetry for OSAS screening at the internal medical wards.Results: One hundred and forty-four subjects were included the study, and 57 subjects who had a 3% oxygen desaturation index ≥10/hr underwent polysomnography. Seventeen and 29 subjects were diagnosed with moderate and severe OSAS, respectively. According to the receiver operating characteristic (ROC) curve analysis, the STOP-Bang test had a higher diagnostic value using a cutoff of 30 kg/m2 for BMI than using a cutoff of 35 kg/m2. A STOP-Bang score of 3 or greater had a sensitivity of 95.7% and specificity of 42.9% for detecting moderate-to-severe OSAS.Conclusion: The STOP-Bang test is a simple and useful tool for the risk assessment of OSAS.

BACKGROUND/AIMS: Gastrointestinal stromal tumor (GIST) is one of the most common types of submucosal tumors (SMTs). Because of GIST's malignant potential, it is crucial to differentiate it from other SMTs. The present study aimed to identify characteristic endoscopic findings of GISTs in the small intestine. METHODS: We reviewed the clinicopathological and endoscopic findings of 38 patients with endoscopically or surgically resected SMTs in the small intestine. SMTs were classified into GIST and non-GIST groups, and clinicopathological and endoscopic findings were compared between the 2 groups. RESULTS: Fifteen patients had GIST and 23 patients had other types of SMTs in the small intestine. Comparison of the endoscopic findings between the 2 groups revealed that dilated vessels in the surrounding mucosa were significantly more in number in the GIST group than in the non-GIST group (P<0.05). However, there were no other differences in endoscopic findings between the 2 groups. Among patients with GISTs, the presence of dilated vessels in the surrounding mucosa was not associated with bleeding risk, tumor size, or metastasis rate at diagnosis. CONCLUSIONS: Dilated vessels in the surrounding mucosa, identified during balloon-assisted endoscopy, may be a diagnostic indicator for GIST in the small intestine. However, its clinical significance should be further analyzed.
Diagnosis ; Endoscopy ; Gastrointestinal Stromal Tumors ; Hemorrhage ; Humans ; Intestine, Small ; Mucous Membrane ; Neoplasm Metastasis

Purpose：A new simple and noninvasive stretch sensor (STR) has been developed to detect chest wall motion for respiratory rehabilitation. The purpose of this study was to investigate the validity of chest wall motion measurements obtained using the new stretch sensor.Methods：Twelve healthy male volunteers wore three different sensors (STR, respiratory inductance plethysmography [RIP], and flowmeter) while they performed the testing protocol, which included natural breathing (120 s), deep breathing (60 s), and polypneic (60 s) and apneic (30 s) conditions in the upright stance. The STR was implemented in two bands for the participant's chest and abdominal measurements. The ability of the three sensors to measure respiration and chest wall motion was analyzed.Results：The output signals from the STR showed significant correlation with the flow and RIP signals (r＝0.5-1.00, p＜0.05). The total number of breaths obtained from the STR signals showed no significant difference from the reference values obtained from the flowmeter signals (p＞0.05). The amplitude of the STR output signals changed significantly according to the respiratory maneuver used. Specifically, it increased from apnea, polypnea, and natural breathing to deep breathing (p＜0.05).Conclusion：The newly developed stretch sensor is capable of measuring chest wall motion in various breathing maneuvers in young men.

An 81-year-old woman sustained a fracture of the vertebra, resulting in grace deformation. After surgery for the spinal fixation, she suffered from left femoral neuropathic pain and motor weakness of both lower extremities. Daily repetitive transcranial magnetic stimulation (rTMS) of the lower extremity area in the right motor cortex was applied using a figure-8 coil connected to a magnetic stimulator (MagPro R30；Nagventure)．One thousand pulses per session were delivered (10 trains of 10Hz for 10 seconds with 25-seconds intertrain interval) in one day, and this treatment continued for 2 weeks except Sunday. The intensity of rTMS was set at the resting motor threshold for that day. rTMS together with physical therapy resulted in a remarkable amelioration of the femoral pain and motor weakness of both lower extremities. Pain on a Visual Analogue Scale dropped from 70％ to 22％, and walking speed and walking rate increased. Functional Independence Measure score increased from 58 to 79, and Euro QOL 5 score increased from 0.419 to 0.768. As previously reported in cases of post-stroke pain and motor weakness, rTMS together with physical therapy exerted measurable beneficial effects on intractable pain and motor weakness caused by spinal orthodontic fixation.