The development and validation of an LC-MS/MS method for the quantification of CZ112, a prodrug of 9-Nitrocamptothecin in rat plasma
Publication date: Available online 10 November 2019Source: Journal of Pharmaceutical and Biomedical AnalysisAuthor(s): Ziming Wang, Changmin Shao, Zhiwei Hu, Jian Zheng, Qiang Zhang, Xiaohan Kou, Zijia Wang, Tao Yu, Zhisong Cao, Yang WangAbstract9-Nitrocamptothecin-20-O-propionate (CZ112) and 9-Nitrocamptothecin (9NC) are the bioactive derivatives of camptothecin (CPT), an alkaloid isolated from Camptotheca acuminata, and have been confirmed to possess high anti-cancer properties. In the present study, 9NC was identified as the major metabolite of CZ112 in rat plasma through HPLC/photodiode array detection (PDA) and liquid chromatography tandem mass spectrometry (LC–MS/MS) analysis. A highly sensitive LC–MS/MS method was developed and validated for the simultaneous analysis of CZ112 and 9NC in rat plasma, and camptothecin-20-O-acetate (CZ44) was used as an internal standard (IS). The calibration curves were linear (r2 > 0.999) over concentrations from 2.5 to 320 ng/mL for both CZ112 and 9NC. The method had an accuracy of 96.7–109.6%, and the intra- and inter-day precision (RSD%) were 10.9% or less for CZ112 and 9NC. The stability data showed no significant degradation occurred under the experimental conditions. This method was successfully applied to the pharmacokinetic study of CZ112 and its metabolite 9NC in rat plasma after intravenous and intragastric administration. The oral bioavailability of CZ112 was 6.2 ±&thinsp...
To identify the independent risk factors of concurrent endometrial cancer among women with endometrial hyperplasia and build the clinical prediction model incorporating the clinical and pathological markers.
To determine the adherence to the recommended practices for performing a risk-reducing bilateral salpingo-oophorectomy (RRBSO) as described by the American College of Obstetricians and Gynecologists and Society of Gynecologic Oncology. We sought to determine if adherence differed by type of training i.e., gynecologic oncologists versus benign gynecologists. Additionally, we aimed to determine the incidence of ovarian cancer diagnosed at the time of RRBSO in a large cohort of patients with a BRCA mutation.
Publication date: 15 June 2020Source: Chemical Engineering Journal, Volume 390Author(s): Guozhu Tan, Yingtao Zhong, Linlin Yang, Yaodong Jiang, Jianqiang Liu, Fei Ren
Publication date: Available online 26 February 2020Source: British Journal of Oral and Maxillofacial SurgeryAuthor(s): S. Thiagarajan
(American Society for Radiation Oncology) A new clinical trial suggests that immunotherapy given before other treatments for oral cavity cancers can elicit an immune response that shrinks tumors, which could provide long-term benefit for patients. In the randomized trial, two neoadjuvant doses of nivolumab given with or without ipilimumab led to complete or partial tumor shrinkage in most cases and did not delay any patients from continuing on to standard treatment. Findings will be presented at the 2020 Multidisciplinary Head and Neck Cancers Symposium.
Squamous cell carcinoma (SCC) of the tongue is the most common oral cancer. Because of the tongue ’s frequent movement, abundant lymphatic drainage, and rich blood supply, the SCC is prone to regional lymph nodes and distant metastases, and its prognosis is worse than that of the other oral cancers.1 In addition, because of its special location, it and its secondary tissue defect postperativel y may impair the patient’s pronunciation and swallowing. Reliable and stable therapeutic targets can improve the curative effect and reduce the toxic side effects caused by surgery, radiotherapy, and chemotherapy.
Abstract Chlorogenic acid is a widely distributed natural compound with many important pharmacological effects, which are found in a variety of plants. It is also an important secondary metabolite in plants. As a natural plant extract from a wide range of sources, in vitro and in vivo studies have found that the main pharmacological effects of chlorogenic acid are antioxidant, antiinflammatory, antibacterial, antiviral, hypoglycemic, lipid lowering, anticardiovascular, antimutagenic, anticancer, immunomodulatory, etc. Therefore it may play an important role in promoting human health. For example, it can provide ne...
Conclusion: The infrahyoid myocutaneous flap is a reliable and convenient flap which can be used as a good alternative for free flaps in small and medium-sized defects of the oral cavity.
Conclusion: In this study, the combination of Nimotuzumab plus platinum/taxane based chemotherapy was active and well tolerated in Indian patients in R/M SCCHN. Addition of Nimotuzumab to chemotherapy had a response rate of 38.2% and median PFS of 5.2 months are strong arguments for clinically testing this combination.
AbstractOral tumor microenvironment is characterized by chronic inflammation signified with infiltrating leukocytes and soluble mediators which cause immune suppression. However, how immunosuppressive cells like myeloid-derived suppressor cells (MDSCs) maintain the immunosuppressive tumor microenvironment and influence T cell function in oral squamous cell carcinoma (OSCC) patients remains poorly understood. In the present study, we found that percentages of MDSCs were higher in oral cancer patients compared to healthy individuals and correlated with cancer stage. Monocytic MDSCs (M-MDSCs) were prevalent in the periphery, ...