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IntroductionPrevious studies demonstrated that the implementation of the Kidney Disease Improving Global Outcomes (KDIGO) guideline-based bundle, consisting of different supportive measures in patients at high risk for acute kidney injury (AKI), might reduce rate and severity of AKI after surgery. However, the effects of the care bundle in broader population of patients undergoing surgery require confirmation.Methods and analysisThe BigpAK-2 trial is an international, randomised, controlled, multicentre trial. The trial aims to enrol 1302 patients undergoing major surgery who are subsequently admitted to the intensive care or high dependency unit and are at high-risk for postoperative AKI as identified by urinary biomarkers (tissue inhibitor of metalloproteinases 2*insulin like growth factor binding protein 7 (TIMP-2)*IGFBP7)). Eligible patients will be randomised to receive either standard of care (control) or a KDIGO-based AKI care bundle (intervention). The primary endpoint is the incidence of moderate or severe AKI (stage 2 or 3) within 72 hours after surgery, according to the KDIGO 2012 criteria. Secondary endpoints include adherence to the KDIGO care bundle, occurrence and severity of any stage of AKI, change in biomarker values during 12 hours after initial measurement of (TIMP-2)*(IGFBP7), number of free days of mechanical ventilation and vasopressors, need for renal replacement therapy (RRT), duration of RRT, renal recovery, 30-day and 60-day mortality, intensive care unit length-of-stay and hospital length-of-stay and major adverse kidney events. An add-on study will investigate blood and urine samples from recruited patients for immunological functions and kidney damage.Ethics and disseminationThe BigpAK-2 trial was approved by the Ethics Committee of the Medical Faculty of the University of Münster and subsequently by the corresponding Ethics Committee of the participating sites. A study amendment was approved subsequently. In the UK, the trial was adopted as an NIHR portfolio study. Results will be disseminated widely and published in peer-reviewed journals, presented at conferences and will guide patient care and further research.Trial registration numberNCT04647396.

Background Despite their central role in the global response to the COVID-19 pandemic and previous infectious disease outbreaks, factors influencing the acceptability and implementation of social distancing measures are poorly understood. This systematic review aims to identify such factors drawing on qualitative literature. Methods A systematic search was carried out in eleven databases. Papers were included in the review if they reported on qualitative studies of factors influencing the implementation of social distancing measures in potentially epidemic infectious diseases. An adapted meta-ethnographical approach was used for synthesis. Review findings were assessed for strength and reliability using GRADE-CERQual. Results Twenty-nine papers were included from the systematic search that yielded 5620 results, and supplementary methods. The review identifies two broad categories of barriers to social distancing measures: individual- or community-level psychosocial phenomena, and shortcomings in governmental action or communication. Based on this, 25 themes are identified that can be addressed to improve the implementation of social distancing. Conclusion Among other findings, the review identifies the need for good communication as well as the need for authorities to provide comprehensive support as two key opportunities to increase acceptability and adherence. Further important enablers of adherence are adequate preparedness and appropriate legislation, the presence of community involvement, solidarity within communities and trust in governments and authorities.

Health-Promoting School (HPS) interventions aim to reduce bullying and violence via curriculum, environmental and family/community-engagement components. Despite evidence of their effectiveness, factors influencing the implementation of such interventions are poorly understood. This systematic review aims to examine such factors by assessing qualitative process evaluations of HPS interventions aiming to reduce bullying, aggression or violence. A comprehensive systematic search of 12 databases was carried out, and 20 reports from 17 studies were included. Thematic synthesis was used to identify factors affecting implementation. Factors that enable implementation were related to programme characteristics and stakeholder buy-in, including support from leadership, teachers, students and parents. Good communication and staff climate were important. Interventions were better implemented when they framed health promotion as a core school business, were supported by a national policy, used local data to show need and effectiveness and provided high-quality, pragmatic and accessible staff training. The results of this review can serve to guide and facilitate the design and implementation of future bullying and violence prevention programmes. Since there is significant overlap in terms of the important pillars and guiding principles for all interventions guided by the HPS framework, the findings may apply to outcomes beyond bullying and violence.

Blood vessels support tumours by providing nutrients and oxygen, while also acting as conduits for the dissemination of cancer(1). Here we use mouse models of breast and lung cancer to investigate whether endothelial cells also have active ‘instructive’ roles in the dissemination of cancer. We purified genetically tagged endothelial ribosomes and their associated transcripts from highly and poorly metastatic tumours. Deep sequencing revealed that metastatic tumours induced expression of the axon-guidance gene Slit2 in endothelium, establishing differential expression between the endothelial (high Slit2 expression) and tumoural (low Slit2 expression) compartments. Endothelial-derived SLIT2 protein and its receptor ROBO1 promoted the migration of cancer cells towards endothelial cells and intravasation. Deleting endothelial Slit2 suppressed metastatic dissemination in mouse models of breast and lung cancer. Conversely, deletion of tumoural Slit2 enhanced metastatic progression. We identified double-stranded RNA derived from tumour cells as an upstream signal that induces expression of endothelial SLIT2 by acting on the RNA-sensing receptor TLR3. Accordingly, a set of endogenous retroviral element RNAs were upregulated in metastatic cells and detected extracellularly. Thus, cancer cells co-opt innate RNA sensing to induce a chemotactic signalling pathway in endothelium that drives intravasation and metastasis. These findings reveal that endothelial cells have a direct instructive role in driving metastatic dissemination, and demonstrate that a single gene (Slit2) can promote or suppress cancer progression depending on its cellular source.

AimTo systematically review qualitative literature on social distancing in order to identify and describe factors that enable or prevent its implementation.MethodsA rapid systematic qualitative review was conducted in accordance with PRISMA and ENTREQ guidelines. A comprehensive systematic search was carried out in MEDLINE, EMBASE, PsychINFO, Global Health, CINAHL and Web of Science. Included papers (i) report on primary qualitative studies (ii) of the barriers and facilitators to the implementation of social distancing measures (iii) in potentially epidemic infectious diseases. After critical appraisal and standardised data extraction, a meta-ethnographical approach was used for synthesis. Review findings were assessed for strength and reliability using CerQUAL.Results28 papers were included from the systematic search that yielded 5620 results. One additional paper was found by searching references. The review identifies two broad categories of barriers to social distancing measures: individual- or community-level psychological or sociological phenomena, and perceived shortcomings in governmental action. Based on this, 25 themes are identified that can be addressed to improve the implementation of social distancing.ConclusionThere are many barriers, on different levels, to the implementation of social distancing measures. Among other findings, the review identifies the need for good communication as well as the need for authorities to provide comprehensive support as two key opportunities to increase acceptability and adherence. High-quality research is needed during the COVID-19 pandemic to better describe mechanisms by which implementation of social distancing can be improved, and, more importantly, what is already known has to be put into practice.

Kaposi sarcoma (KS) is an endothelial malignancy caused by human herpes virus‐8 (HHV‐8) infection. The epidemic and iatrogenic forms of childhood KS result from a profound and acquired T cell deficiency. Recent studies have shown that classic KS of childhood can result from rare single‐gene inborn errors of immunity, with mutations in WAS, IFNGR1, STIM1, and TNFRSF4. The pathogenesis of the endemic form of childhood KS has remained elusive. We review childhood KS pathogenesis and its relationship to inherited and acquired immunodeficiency to oncogenic HHV‐8.