Benzotrithiophene-based covalent organic frameworks for real-time visual onsite assays of enrofloxacin.

Enrofloxacin (ENR) is a fluoroquinolone antibiotic that has been used to treat bacterial diseases in aquaculture extensively. ENR might accumulate in the body and cause severe liver damage. Therefore, it is necessary to develop a method for rapid detection of ENR. Herein, amine monomers with different numbers of amino groups, charge and length (1,3-diaminoguanidine monohydrochloride: DMGH, triaminoguanidine hydrochloride: TAGH, hydrazine: H) were used to regulate the fluorescence of benzotrithiophene tricar-baldehyde (BTT)-based covalent organic frameworks (COFs) for real-time visual onsite assays of ENR for the first time. The C3 symmetric COFBTT-TAGH only had one emission peak at 540 nm, while C6 symmetric COFBTT-DMGH and COFBTT-H had two emission peaks. COFBTT-TAGH could achieve the color transition from green to blue with increasing ENR. Thus test paper and gel were designed as real-time detection tools, combined with a smartphone APP. The detection limits obtained by RGB analysis were 106.2 nM for test paper and 26.00 nM for test gel, respectively. This method was applied to detect ENR in fish and clam metabolite successfully. This work also provides important reference to regulate fluorescence of COFs according to actual application.

Efficacy of intraoperative GeneSearch Breast Lymph Node (BLN) Assay for breast cancer metastasis detection in sentinel lymph node in Chinese patients.

UNLABELLED: Although intraoperative assessment of the sentinel lymph node (SLN) is useful, it has not gained popularity in China as it involves a heavy workload for pathologists. We conducted a prospective clinical feasibility study of the GeneSearch Breast Lymph Node (BLN) Assay performed in 158 SLNs from 97 patients by comparison with postoperative permanent section histopathology, to validate its potential usefulness in China. Every SLN was cut into alternating 1.5 to 3.0 mm slabs. The BLN assay processed 50% of the fresh alternating slabs to detect the presence of cytokeratin 19 and mammaglobin mRNA. Assay results were compared with those for permanent section histopathology and intraoperative imprint cytology. Slides for imprint cytology were prepared from the BLN assay node tissue before it was processed. Full axillary lymph node (ALN) dissections were performed on some patients after a SLN biopsy. The BLN assay was successfully performed on 158 SLNs from 97 patients. Overall performance of the BLN assay compared with permanent section histopathology was sensitivity 83.9% (26/31), specificity 95.5% (63/66), positive predictive value 89.7% (26/29), negative predictive value 92.6% (63/68), and overall agreement 91.8% (89/97). The BLN assay detected about 25% more metastases than imprint cytology. Moreover, the BLN assay correctly identified most of the additional non-sentinel ALNs metastases (P = 0.005). Our results from a large series of Chinese patients with breast cancer indicate that the BLN assay may be a viable alternative for the standard intraoperative procedures used for metastases detection, especially in early stage breast cancer patients. Name of the trial register: GeneSearch Breast Lymph Node (BLN) Assay China Registration Study. CLINICAL TRIAL REGISTRATION NUMBER: NCT00869674.

[Significance of high-risk human papillomavirus DNA in atypical squamous cells, cannot exclude high-grade squamous intraepithelial lesion].

OBJECTIVE: To explore significance of high-risk human papillomavirus (HR-HPV) testing in atypical squamous cells, cannot exclude high grade squamous intraepithelial lesion (ASC-H). METHODS: Presence of HR-HPV DNA was examined in 45 patients with ASC-H using hybrid capture II (HC-II) test. Colposcopic examination and biopsy were taken all results were evaluated. RESULTS: Overall, 33 of 45 (73.3%) ASC-H cases were biopsy proven cervical intraepithelial lesion (CIN). 36 of 45 ASC-H cases were HPV-DNA positive, including 19 cases of HSIL and over lesion; whereas no HSIL or over was found in 9 HR-HPV negative cases. Sensitivity and negativity predictive value of HR-HPV in ASC-H with HSIL and over lesion were both 100%. CONCLUSIONS: ASC-H strongly predicts the presence of HSIL, HR-HPV may serve as a predict select whether a patient with ASC-H should take colposcopic examination immediately, patients with positive HR-HPV should undergo immediate colposcopic examination, while negative HR-HPV is an excellent predictor of the absence of HSIL.