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Introduction Community-acquired pneumonia (CAP) is common and remains the leading infectious cause of death worldwide. Antibiotics remain the mainstay of treatment, but organisms are often not identified, necessitating empirical treatment. Current treatment guidelines recommend combination therapy with beta-lactams and macrolides or monotherapy with fluoroquinolones for non-severe CAP. However, rising antibiotic resistance and safety concerns have led to increased doxycycline use, despite limited evidence supporting its efficacy. Our goal is to conduct a pragmatic, open-label, randomised clinical trial comparing the effectiveness of azithromycin with that of doxycycline in combination with beta-lactam therapy in adult patients hospitalised for CAP. Methods and analysis Patients presenting to the emergency department or directly referred to the hospital with a clinical presentation concerning for CAP and need for hospitalisation are eligible. We plan to enrol 1120 adults hospitalised at six hospitals across four states, including rural, suburban and urban settings and academic and community hospitals. Randomisation will be 1:1 using an electronic health record (EHR)-embedded screening and randomisation tool triggered by the treating clinician’s orders for azithromycin or doxycycline. Outcomes will be ascertained pragmatically via EHR-based data retrieval and will not require additional study visits. Our primary outcome is days alive and out of the hospital through day 28. Secondary outcomes include oxygen-free days; a composite of a need for advanced respiratory support or in-hospital mortality with analyses of each component separately; an ordinal measure of clinical deterioration defined by a prespecified severity scale; and 60-day and 180-day mortality. Safety outcomes are the incidence of Clostridioides difficile infection and QT prolongation. Analyses will follow an intention-to-treat framework, with per-protocol analyses for sensitivity. The primary endpoint will be compared between groups using a stratified van Elteren test, with supportive analyses using proportional odds regression and analysis of covariance adjusted for key covariates. Ethics and dissemination The Mayo Clinic Institutional Review Board reviewed and approved this protocol with a waiver of written consent, requiring verbal consent to be obtained by the clinician initiating the antibiotics (IRB# 24–0 06 503). Findings will be disseminated through peer-reviewed publications and international conference presentations. Trial registration number NCT07164131 .

Abstract Rationale Critical care education has been identified as a global priority to improve the early identification and management of common syndromes, including sepsis and respiratory failure. International practice varies widely, and frontline clinical team perspectives remain poorly defined. The CERTAIN (Checklist for Early Recognition and Treatment of Acute Illness and iNjury) program provides a structured, checklist-based approach shown to improve the delivery of best practices and patient-centered outcomes worldwide. Over the past decade we have performed a needs assessment at the start of each international CERTAIN program. We performed a retrospective analysis of these data to examine the critical care domains prioritized by frontline interprofessional teams to inform global training priorities. MethodsWe developed an anonymous online survey consisting of 20 previously defined activities essential to the practice of critical care. Participants ranked these activities using Q-sort methodology on a forced distribution scale from -4 (lowest priority) to + 4 (highest priority). Individual rankings were summed across all participants to generate aggregate scores for each activity, with higher values reflecting greater collective prioritization. Aggregate scores were calculated for the entire cohort and each site and summarized with bar plots to illustrate prioritization patterns across critical care domains. ResultsA total of 213 intensivists, emergency medicine physicians, nurses, and pharmacists from hospitals in China (75), Cambodia (70), Croatia (31), Japan (24) and India (13) completed the survey. The distribution of priorities across content domains is illustrated in Figure. Management of shock, sepsis, mechanical ventilation, and respiratory failure received the highest aggregate scores. Interprofessional critical care coordination was the only process of care activity identified as high priority, and transitions of care, patient centered communication, and shared decision making were consistently ranked lowest. While minor variation existed across individual sites, resuscitation and the acute management of high-risk clinical conditions were consistently prioritized over processes of care and patient-centered care domains. ConclusionThis multicenter analysis demonstrates consistent interprofessional clinician prioritization of acute clinical management topics for training. These insights inform both areas of emphasis and highlight challenges that CERTAIN and other programs face to improve global patient care delivery. Variation in care processes has been consistently identified as the largest modifiable factor to improve patient outcomes, and cultural differences may present barriers to engagement on the best approaches to patient centered care. Figure. Distribution of aggregate Q-sort scores across 20 critical care activities. Scores represent summed participant rankings (n=213) from -4 (lowest priority) to +4 (highest priority). This abstract is funded by: None

Abstract Background: Pembrolizumab has been increasingly used off label for recurrent gliomas, yet biomarkers predicting response are poorly defined. Gliomas exhibit substantial molecular heterogeneity across Glioblastoma, IDH-wildtype (GBM), Astrocytoma, IDH-Mutant (A-IDHm), and Oligodendroglioma, 1p/19q co-deleted (OLIGO), which may influence immunotherapy efficacy. This study aimed to identify molecular predictors of progression-free survival (PFS) in recurrent glioma patients treated with pembrolizumab. Methods: Adults ≥18 years with recurrent glioma receiving ≥2 cycles of pembrolizumab between 2014 - 2024 were retrospectively identified across Mayo Clinic. Next-generation sequencing (NGS) reports were reviewed and archival tumor tissue resected prior to pembrolizumab initiation was analyzed when available. Comprehensive molecular profiling was performed using the Mayo Clinic Solid Tumor Panel which employs the Illumina Tru-Sight Oncology 500 High-Throughput NGS assay. Progression was assessed using RANO 2.0 criteria. Genomic alterations (clinically relevant sequences and/or copy-number variants) were evaluated using the Kaplan-Meier method, with differences in PFS compared using the log-rank test. Results: Thirty-three patients were included [median (range) age: 44.0 (21-76) years; 63.6% male]. The interval between tumor tissue sampling and pembrolizumab initiation was 9.9 (0.9-176.1) months, and median treatment duration was 2.8 (1.4-10.4) months. Median PFS for the overall cohort was 2.4 (0.8-15.2) months, and median overall survival from pembrolizumab initiation was 6.9 (0.9-48.2) months. Patients with OLIGO (n=8) had a longer PFS [4.6 (1.9-15.2) months] than either A-IDHm [n=11; PFS 2.1 (1.1-4.4) months] or GBM [n=14; PFS 2.3 (0.8-9.2) months]. Within OLIGO, CDKN2A/B heterozygous deletion (n=3) predicted a shorter PFS (3.9 vs 10.9 months; p=0.0462), while in A-IDHm, FANC mutation (n=2) was associated with a longer PFS (4.17 vs 1.61 months; p=0.0224). No significant associations with PFS were observed for other altered genes or pathways evaluated, including but not limited to Tumor Mutational Burden, EGFR, RB1, TP53, FUBP1, NF 1 or 2, PTEN, PDGFRA, PIK3CA, PIK3R1, CDK4, KRAS, MLH1, MLH2, MSH6 genomic alterations or CDKN2A/B homozygous deletion (all p>0.05). Conclusions: Pembrolizumab shows limited overall efficacy in recurrent gliomas, however, exploratory analyses identified several subtype-specific genomic alterations that may correlate with PFS. These hypothesis-generating findings highlight the potential influence of underlying tumor biology on immunotherapy response and warrant further validation in larger, prospective cohorts. Citation Format: Shameel Shafqat, Muhammad Asad Maqbool, Hussam Al Kateb, Terry C. Burns, Jian L. Campian, Shannon P. Fortin Ensign, Evanthia Galanis, Julie E. Hammack, Cristaine M. Ida, Mitch L. Klebig, Timothy J. Kaufmann, Autumn C. Moon, Maciej M. Mrugala, Bryan J. Neth, Alyx B. aPorter, Michael W. Ruff, Ugur T. Sener, Wendy J. Sherman, Joon H. Uhm, Rachael A. Vaubel, Sani H. Kizilbash. Molecular correlates of progression-free survival in recurrent gliomas treated with pembrolizumab [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2026; Part 1 (Regular Abstracts); 2026 Apr 17-22; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2026;86(7 Suppl):Abstract nr 5253.

Abstract Background Outpatient parenteral antimicrobial therapy (OPAT) allows patients to complete extended antimicrobial treatment at home, improving quality of life and reducing healthcare costs. National guidelines outline best practices for antimicrobial administration, vascular access management, monitoring, and recommend involving an infectious disease physician and a multidisciplinary team. Evaluating adherence to these practices can identify improvement opportunities and enhance outcomes. The primary objective of this study was to assess patient outcomes related to adherence to OPAT best practices at Mayo Clinic Health System – Southwest Wisconsin (MCHS–SWWI). Secondary objectives included evaluating adherence to key process metrics and identifying associations between baseline characteristics and outcomes. Methods This retrospective cohort study included adults discharged from MCHS–SWWI on home OPAT from November 2021 to July 2024. Patients were excluded if under 18 years old or if they received OPAT in non-home settings (e.g., skilled nursing, infusion center). Data on process metrics, outcomes, and safety were collected through manual chart review. These findings were evaluated against established best practices to assess the OPAT program's adherence and determine the impact of this adherence on patient outcomes. Statistical analysis used Pearson’s chi-square tests and Wilcoxon rank sum tests to measure associations of patient characteristics with outcomes. Results A total of 164 patients were included. The MCHS-SWWI OPAT program demonstrated high adherence ( > 85%) to majority of established best practices. Successful OPAT completion occurred in 92.7% of patients, and overall incidence of adverse events and poor outcomes was generally low. Adherence to best practices was below 85% for vascular access selection (81.7%) and completion of weekly labs and vascular access care throughout the OPAT course (∼69%). Conclusion High adherence to OPAT best practices led to a generally low incidence of adverse events, treatment failures, and other unfavorable patient outcomes. The results of this study provide valuable insights to guide institutional quality improvement initiatives aimed at optimizing patient outcomes in OPAT therapy through targeted interventions. Disclosures All Authors: No reported disclosures

Abstract Introduction Mature T-cell lymphomas, including aggressive nodal PTCL, advanced stage CTCL, and extranodal cytotoxic lymphomas, are associated with poor outcomes. While karyotype (KT) abnormalities are frequently detected in these diseases, limited data exist on their prognostic significance. We evaluated the impact of KT abnormalities, including complex KT and specific chromosomal lesions, along with clinical and demographic factors, on overall survival (OS) in a single-center cohort. Methods We retrospectively reviewed 189 patients (pts) diagnosed with T-cell lymphoma who had successful metaphase KT at diagnosis from peripheral blood (PB), bone marrow (BM), or tumor tissue. T-cell lymphomas were classified according to WHO 2022 into nodal, extranodal/cytotoxic, and cutaneous subtypes. CTCLs were stratified into indolent (Early-stage CTCL, IA–IB) and aggressive (Sézary syndrome, transformed mycosis fungoides). KTs classified as normal, abnormal, and complex (≥3 abnormalities), and recurrent abnormalities were recorded. Baseline clinical and lab data were collected. OS was estimated using the Kaplan-Meier (KM) method with 95% confidence intervals (CI). Univariate Cox proportional hazards (CPH) model identified factors associated with OS, and significant variables were entered into multivariate CPH models. Results The median age was 66 years (IQR 55-74); 65% were male and 35% were female. Overall, 58% of pts were alive at analysis. Nodal PTCL was the most common subtype (113 pts, 60%), followed by early CTCL (30, 16%), aggressive CTCL (24, 13%), and extranodal lymphomas (22, 12%). KT was obtained from 166 BM (86%), 26 PB (13%), and 2 tissue (1%) specimens. Among abnormal KTs, 63% were from BM, 35% from PB, and 2% from tissue. Specific abnormalities included gain of chr1 (5%), gain of chr3 (5%), gain of chr7 (5%), gain of chr8 (5%), monosomy 5 or del(5q) (4%), monosomy 9 or del(9q13q22) (4%), Monosomy 10 (4%), loss of chrY (5%), and presence of marker chromosomes (5%).Of the 189 pts, 48 (25%) had an abnormal KT, while 141 (75%) had a normal KT. Complex KT was observed in 31 (16%) pts. Abnormal non-complex and complex KTs were seen respectively in: aggressive CTCL (8%, 42%), nodal PTCL (4%, 13%), extranodal (9%, 14%), and early CTCL (27%, 10%). KM survival analysis showed a median OS for the entire cohort of 95 months (95% CI: 65-245). Pts with a normal KT had a median OS of 143 months (95% CI: 81-inf) compared with 34 months (95% CI: 18-83) for those with an abnormal KT. Pts without a complex KT had a median OS of 144 months (95% CI: 85-inf), whereas those with a complex KT had 14 months (95% CI: 4-25). For specific abnormalities, pts with gain of chr7 had OS of 3 months, gain of chr8 had 19 months, monosomy 5 or del(5q) had 4 months, loss of chrY had 30 months, gain of chr1 had 4.5 months, gain of chr3 had 7.5 months, monosomy 9 or del(9q13q22) had 2 months, monosomy 10 had 17 months, and marker chromosome presence had 5.5 months. Univariate CPH identified complex KT (HR = 3.9, p < 0.001), gain of chr1 (HR = 5.7, p < 0.001), gain of chr3 (HR = 4.6, p < 0.001), monosomy 5 or del(5q) (HR = 4.6, p < 0.001), gain of chr7 (HR = 4.2, p < 0.001), gain of chr8 (HR = 3.3, p < 0.001), monosomy 9 or del(9q13q22) (HR = 4.9, p < 0.001), monosomy 10 (HR = 2.8, p = 0.008), and marker chromosomes (HR = 4.6, p < 0.001) as adverse factors. Higher platelet count was protective (HR = 0.9, p < 0.001), while greater number of abnormalities increased hazard (HR = 1.1, p < 0.001). In multivariate CPH model, complex KT (HR = 3.1, 95% CI: 1.2-8.2, p = 0.019), monosomy 9 or del(9q13q22) (HR = 4.4, 95% CI: 1.2-15.4, p = 0.022), gain of chr1 (HR = 3.5, 95% CI: 1.1-11.8, p = 0.042), and low platelet count (HR = 0.98, 95% CI: 0.97-0.99, p = 0.006) remained independent predictors of poor OS. Conclusion: We demonstrate that cytogenetic abnormalities detected in PB or BM, most notably complex KTs, confer a markedly poor prognosis in aggressive T-cell lymphomas. The integration of KT data with clinical parameters, such as platelet count, offers a powerful approach to refine risk stratification, identify biologically high-risk subgroups, and potentially guide personalized therapeutic strategies in this challenging disease spectrum. To our knowledge, this is one of the largest single-center studies assessing the prognostic significance of KT in mature T-cell lymphomas, providing novel insights into the role of specific chromosomal lesions in patient outcomes.

ABSTRACTPatients with vascular anomalies (VAs) require expert multidisciplinary care. No prior studies have characterized the sociodemographic characteristics across multiple VA centers. We collected data on 5783 patients receiving care at 20 VA centers between July 1, 2020 through December 31, 2022. Male patients were underrepresented compared to the state‐level census data at 17/20 centers. Black and Asian patients were underrepresented at 14/20 and 12/20 centers, respectively. The median distance to the hospital was 48 miles, and median age was 12.0 years. These data suggest that race, sex, age, and distance from the hospital could impede the ability to access expert VA care.

Abstract Objective Limb girdle muscular dystrophies (LGMDs) are a group of genetically heterogeneous autosomal conditions with some degree of phenotypic homogeneity. LGMD is defined as having onset >2 years of age with progressive proximal weakness, elevated serum creatine kinase levels and dystrophic features on muscle biopsy. Advances in massively parallel sequencing have led to a surge in genes linked to LGMD. Methods The ClinGen Muscular Dystrophies and Myopathies gene curation expert panel (MDM GCEP, formerly Limb Girdle Muscular Dystrophy GCEP) convened to evaluate the strength of evidence supporting gene–disease relationships (GDR) using the ClinGen gene–disease clinical validity framework to evaluate 31 genes implicated in LGMD. Results The GDR was exclusively LGMD for 17 genes, whereas an additional 14 genes were related to a broader phenotype encompassing congenital weakness. Four genes ( CAPN3 , COL6A1 , COL6A2 , and COL6A3 ) were split into two separate disease entities, based on each displaying both dominant and recessive inheritance patterns, resulting in curation of 35 GDRs. Of these, 30 (86%) were classified as definitive, 4 (11%) as moderate, and 1 (3%) as limited. Two genes, POMGNT1 and DAG1 , though definitively related to myopathy, currently have insufficient evidence to support a relationship specifically with LGMD. Interpretation The expert‐reviewed assertions on the clinical validity of genes implicated in LGMDs form an invaluable resource for clinicians and molecular geneticists. We encourage the global neuromuscular community to publish case‐level data that help clarify disputed or novel LGMD associations.

Key Points Renovascular disease impairs the capacity of human adipose tissue–derived mesenchymal stem/stromal cells to repair ischemic murine kidneys. miR-378h modulated the capacity of renovascular disease adipose tissue–derived mesenchymal stem/stromal cells to repair ischemic kidneys in vivo . Background Renovascular disease leads to renal ischemia, hypertension, and eventual kidney failure. Autologous transplantation of adipose tissue–derived mesenchymal stem/stromal cells (MSCs) improves perfusion and oxygenation in stenotic human kidneys, but associated atherosclerosis and hypertension might blunt their effectiveness. We hypothesized that renovascular disease alters the human MSC transcriptome and impairs their reparative potency. Methods MSCs were harvested from subcutaneous abdominal fat of patients with renovascular disease and healthy volunteers ( n =3 each), characterized and subsequently injected (5×10 5 /200 μ l) into mice 2 weeks after renal artery stenosis or sham surgery ( n =6/group). Two weeks later, mice underwent imaging and tissue studies. MSCs from healthy volunteers and in those with renovascular disease were also characterized by mRNA/microRNA (miRNA) sequencing. Based on these, MSC proliferation and mitochondrial damage were assessed in vitro before and after miRNA modulation and in vivo in additional renal artery stenosis mice administered with MSCs from renovascular disease pretreated with miR-378h mimic ( n =5) or inhibitor ( n =4). Results MSCs engrafted in stenotic mouse kidneys. Healthy volunteer MSCs (but not renovascular disease MSCs) decreased BP, improved serum creatinine levels and stenotic-kidney cortical perfusion and oxygenation, and attenuated peritubular capillary loss, tubular injury, and fibrosis. Genes upregulated in renovascular disease MSCs versus healthy volunteer MSCs were mostly implicated in transcription and cell proliferation, whereas those downregulated encoded mainly mitochondrial proteins. Upregulated miRNAs, including miR-378h, primarily target nuclear-encoded mitochondrial genes, whereas downregulated miRNAs mainly target genes implicated in transcription and cell proliferation. MSC proliferation was similar, but their mitochondrial structure and reparative function both in vivo and in vitro improved after miR-378h inhibition. Conclusions Renovascular disease impaired the reparative capacity of human MSCs, possibly by dysregulating miR-378h that targets mitochondrial genes. Podcast This article contains a podcast at https://dts.podtrac.com/redirect.mp3/www.asn-online.org/media/podcast/JASN/2024_08_21_ASN0000000000000440.mp3

AbstractBackgroundMany patients with quiescent inflammatory bowel disease (IBD) suffer from irritable bowel syndrome (IBS)‐like symptoms. Although these symptoms cause significant reductions in quality of life, evidence‐based treatments are lacking as risk factors and pathophysiology of these symptoms are not clearly defined. We aimed to identify risk factors for development of IBS‐like symptoms in IBD patients with quiescent disease.MethodsWe performed a single‐center retrospective cohort study of adults with IBD from 2015 to 2021. Quiescent IBD was defined by a fecal calprotectin level <250 μg/g of stool or endoscopic evidence of quiescent disease. Cox regression was performed to identify variables that were independently associated with the incident development of IBS‐like symptoms in IBD patients.Key ResultsA total of 368 IBD patients were included for analysis, including 278 patients with UC and 88 with Crohn's disease. 15.5% of quiescent IBD patients developed IBS symptoms, with an incidence rate of (95% CI 48.0–82.0) 63.3 per 1000 person‐years. In the multivariate model, mood disorders (including anxiety and depression) and Crohn's disease were associated with increased risk for developing IBS symptoms. Male sex and higher iron levels conferred lower risk for developing IBS symptoms. Results from the multivariable model were similar in sensitivity analysis with quiescent IBD defined by fecal calprotectin level <150 mcg/g.Conclusions & InferencesMood disorder and Crohn's disease were positively associated with IBS‐like symptoms in quiescent IBD, whereas male sex and iron levels were protective. Our results were robust to different fecal calprotectin levels, arguing against inflammation as a mechanism for IBS‐like symptoms. This data suggests noninflammatory mechanisms may be important in the pathogenesis of IBS‐like symptoms in quiescent IBD. Future work may address whether modifying these risk factors may alter disease course.