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Comparative effectiveness of peroxisome proliferator–activated receptor agonists as second-line therapies for primary biliary cholangitis: A systematic review and network meta-analysis
Martins, Adrielly , Khakoo, Nidah S. , Reddy, Anish, Reynolds, John , Murad, Mohammed , Sultan, Shahnaz , Reddy, Anish , Reddy, Anish, Corpechot, Christophe , Rousseau, Alexandra , Levy, Cynthia

Hepatology | October 6, 2025 | Volume: 83 | Issue: 4 | Pages: 721-734

10.1097/hep.0000000000001465 | PMID 41052304 Get It

Background and Aims: Primary biliary cholangitis is a chronic cholestatic liver disease that may progress to cirrhosis and liver failure. For patients with inadequate response or intolerance to ursodeoxycholic acid, peroxisome proliferator–activated receptor (PPAR) agonists have emerged as second-line options. This study assessed the comparative effectiveness and safety of PPAR agonists in primary biliary cholangitis through a systematic review and network meta-analysis. Approach and Results: A systematic review identified randomized controlled trials evaluating PPAR agonists versus ursodeoxycholic acid, with or without placebo. A frequentist network meta-analysis assessed biochemical response (primary outcome) and ALP normalization (secondary outcome). Pairwise meta-analyses were performed for percentage change in ALP and total bilirubin, and adverse events leading to treatment discontinuation. Data were stratified by baseline ALP, and a random-effects model was used. Eight randomized controlled trials (727 participants) evaluating 4 PPAR agonists were included. All agents outperformed placebo in achieving biochemical response and ALP normalization. Bezafibrate ranked highest for the primary outcome; both bezafibrate and seladelpar ranked highest for the secondary outcome. Percentage ALP reduction did not vary by baseline ALP. Total bilirubin changes were similar across arms, and treatment discontinuations due to adverse events were infrequent. Conclusions: PPAR agonists are effective second-line therapies for primary biliary cholangitis. Treatment ranking differences likely reflect variations in outcomes, populations, and drug mechanisms. In the absence of head-to-head trials, network meta-analysis provides important insights into comparative effectiveness. Further studies are warranted to confirm long-term safety and improve the evaluation of patient-centered outcomes.
Practice Patterns in Management of Low‐ to Intermediate‐Grade Salivary Gland Carcinoma: A Multi‐Institutional Study
Sajisevi, Mirabelle , Nguyen, Kenny , Holcomb, Andrew J. , Vural, Emre , Davis, Kyle P. , Thomas, Carissa M. , Stein, John S. , Aulet, Ricardo , Bell, Rebecca K. , Blasco, Michael A., Bowmaster, Vanessa B., Chung, Jeffson , Cognetti, David M. , Cordero, Joehassin , Donovan, John, Du, Yue , Eskander, Antoine , Feinberg, Philip A. , Garvey, Emily A. , Goldstein, David P. , Goulart, Rafael Nunes, Grasl, Stefan , Giurintano, Jonathan , Hara, Jared H. , Hinni, Michael L., Hua, Nadia , Johnson‐Obaseki, Stephanie , Kalman, Noah S. , Khaja, Sobia F. , Ku, Jamie A., Lambert, Arnaud, Luu, Bao K. , Magliocca, Kelly R. , Santos, Luiz Roberto Medina dos , Michael, C. A., Miles, Brett, Melo, Giulianno Molina de , Moore, Michael G. , Moura, Kauê, Noroozi, Hesameddin, Patel, Rusha , Paydarfar, Joseph A. , Plonowska‐Hirschfeld, Karolina A. , Savaria, Fabrice N., Schmitt, Nicole C. , Shapiro, Justin , Stokes, William A. , Sulibhavi, Anita , Vendra, Varun , Vinh, Daniel , Virgen, Celina G. , Woody, N.M. , Young, Geoffrey D., Enepekides, Danny , Hier, Michael , Ryan, William R. , Holcomb, Andrew J , Thomas, Carissa M , Asarkar, Ameya A , Chung, Jeffson , Chan, Kimberly , Chang, Brent A , Dundar, Yusuf , Dedivitis, Rogerio , Goldstein, David , Goyal, Neerav , Grasl, Stefan , Giurintano, Jonathan , Gupta, Nikita , Habib, Andy , Hackman, Trevor , Henson, Christina , Kejner, Alexandra E , de Melo, Giulianno Molina , Morand, Gregoire B , Paydarfar, Joseph , Sadeghi, Nader , Schmitt, Nicole C , Shaver, Timothy B , Tasoulas, Jason , CALLAS, PETER W. , Burruss, Clayton P. , Chang, Brent A. , Coffey, Charles S. , Cooper, Dylan Jacob , Donovan, John, Edwards, Heather , Erović, Boban M. , Goodman, Joseph , Juloori, Aditya , Michael, Cara, Miles, Brett, Morand, Grégoire B. , Stoeckli, Sandro Johannes , Kakarala, Kiran , Davies, Louise

Laryngoscope Investigative Otolaryngology | September 23, 2025 | Volume: 10 | Issue: 5 | Pages: No page available

10.1002/lio2.70246 | PMID 40995062 Get It

ABSTRACT Objectives To characterize practice patterns and outcomes in the management of low‐ and intermediate‐grade salivary gland carcinoma prior to the existence of treatment guidelines. Methods Analysis of a registry of patients who underwent parotid and submandibular gland resections for low‐and intermediate‐grade carcinomas between 2010 and 2019. Results Of all 786 patients included in the study, 726 (92%) had preoperative imaging and 653 (83%) had preoperative biopsy. Of the 729 patients with parotid gland cancer, the majority underwent superficial ( n = 384, 53%) or total ( n = 254, 35%) parotidectomy. In patients with facial nerve preservation, total parotidectomy was associated with a significant increase in transient facial weakness (72/177 (41%) vs. 82/311 (26%), RR 0.65, 95% CI 0.50–0.84, p < 0.05) and permanent facial nerve weakness (23/176 (13%) vs. 16/301 (5%), RR 0.41, 95% CI 0.22–0.75, p < 0.05) compared to superficial parotidectomy. Adjuvant radiation therapy ( RT ) was delivered to 285 (36%) patients. The proportion of patients receiving adjuvant RT declined significantly over the time period from 2015 to 2019 compared to 2010 to 2014 at 162/504 (32%) and 123/282 (44%), respectively ( RR 0.74, 95% CI 0.61–0.89, p < 0.05). When comparing the time periods from 2015 to 2019 and 2010 to 2014, there was no significant difference in local control rates ( RR 0.52, 95% CI 0.26–1.04, p = 0.06) or regional control rates ( RR 0.75, 95% CI 0.26–2.13, p = 0.58). Conclusions Management of low‐ and intermediate‐grade salivary cancer from 2010 to 2019 was variable, which is expected given the rarity and heterogeneity of the disease and the lack of treatment guidelines prior to 2021. Most patients with parotid malignancies underwent superficial or total parotidectomy. The extent of parotidectomy had an impact on facial nerve function outcomes. Delivery of adjuvant radiation trended down with time. The data presented here will support dissemination of the guidelines and provide data that could inform future trials. Level of Evidence 2b.
Procedure duration predicts outcomes more than prehospital delay in endovascular stroke treatment
Saad, Hassan , Koo, Andrew B. , Grossberg, Jonathan A , Tianwen, Ma, Howard, Brian M. , Sowlat, Mohammad‐Mahdi , Baba, Bachar El , Chacón, Ariana , Jabbour, Pascal , Rai, Ansaar , Dye, Justin , Alaraj, Ali , Cawley, C. Michael , Tong, Frank , Akbik, Feras , Pabaney, Aqueel, Ezzeldin, Mohamad , Kim, Joon‐Tae , Siddiqui, Fazeel , Maier, Ilko , Park, Min S. , Psychogios, Marios‐Nikos, Wolfe, Stacey Q , Starke, Robert M. , Tanweer, Omar , Polifka, Adam , Mokin, Maxim, Brinjikji, Waleed , Dağlıoğlu, Ergün , Williamson, Richard , Altschul, David , Ogilvy, Christopher S. , Crosa, Roberto , Gory, Benjamin , Kan, Peter , Casagrande, Walter, Chowdhry, Shakeel , Stiefel, Michael , Spiotta, Alejandro M , Ma, Tianwen , El Baba, Bachar , Fiorella, David , Yoshimura, Shinichi , Kim, Joon-Tae , Arthur, Adam Stephen , Fragata, Isabel , Siddiqui, Fazeel M , Matouk, Charles , Maier, Ilko , Levitt, Michael R , Grandhi, Ramesh , Wolfe, Stacey Quintero , Shaban, Amir , Navia, Pedro , Osbun, Joshua W , Brinjikji, Waleed , Altschul, David J , Ogilvy, Christopher S , Crosa, Roberto , Paul, Alexandra R , Kan, Peter , Spiotta, Alejandro M , Alawieh, Ali M , Alaraj, Ali , Sowlat, Mohammad-Mahdi , Howard, Brian M , Koo, Andrew B , Chacón-Aponte, Ariana Alejandra , Jabbour, Pascal , Fiorella, David , Yoshimura, Shinichi , Goyal, Nitin , Fragata, Isabel , Mascitelli, Justin R , Matouk, Charles , Levitt, Michael R. , Grandhi, Ramesh , Samaniego, Edgar A , Romano, Daniele G, Navía, Pedro , Cuellar, Hugo , Moss, Mark E, Limaye, Kaustubh , Mokin, Maxim , Gory, Benjamin , Alawieh, Ali

Journal of NeuroInterventional Surgery | September 19, 2025 | Volume: 18 | Issue: 6 | Pages: 1494-1502

10.1136/jnis-2025-023906 | PMID 40973492 Get It

Background Endovascular thrombectomy (EVT) has transformed acute ischemic stroke (AIS) care, with onset-to-puncture (OTP) time widely recognized as a critical determinant of outcome. However, emerging evidence suggests that in-hospital procedure time (PT)—from arterial puncture to final recanalization—may have an equally or more significant impact. This study examines the relative contribution of PT versus OTP to functional outcomes in patients with AIS undergoing EVT. Methods A retrospective analysis was conducted of 6644 patients with AIS treated at 44 international stroke centers from the Stroke Thrombectomy and Aneurysm Registry (STAR; 2016–2023). Multivariable regression, time-equivalence analysis, and marginal effects modeling were used to assess associations between PT, OTP, and 90-day modified Rankin Scale (mRS) outcomes. Centers were stratified by procedural efficiency and compared using propensity score matching (PSM). Mediation analysis evaluated whether PT accounted for inter-center differences. Results PT and OTP were independently associated with functional outcomes; however, PT had a significantly stronger effect (adjusted OR for mRS 0–2: PT=0.56 vs OTP=0.96 per hour). Each 5 min increase in PT was equivalent to 78–100 min of additional OTP in outcome impact. Centers with faster average PT had higher rates of functional independence (number needed to treat (NNT)=10), fewer complications, and lower symptomatic intracranial hemorrhage rates. PT significantly mediated the relationship between center tier and outcomes (Sobel’s P<0.001). Conclusion While minimizing OTP remains important, PT exerts a greater influence on outcomes after EVT. Procedural efficiency should be emphasized in stroke systems of care and included in center performance metrics to improve patient outcomes.
Genetically determined body mass index is associated with diffuse large B‐cell lymphoma in polygenic and Mendelian randomization analyses
Moore, Amy , Teras, Lauren R. , Machiela, Mitchell J. , Arias, Joshua , Monnereau, Alain , Wang, Zhaoming , Vermeulen, Roel , Smedby, Karin E. , Spinelli, John J., Nieters, Alexandra , Bracci, Paige M. , Camp, Nicola J. , Hjalgrim, Henrik, Adami, Hans‐Olov , Albanes, Demetrius, Becker, Nikolaus, Benavente, Yolanda , Clavel, Jacqueline , Curtin, Karen , Ghesquières, Hervé, Glimelius, Bengt, Lan, Qing , Liebow, Mark , McKay, James , Offit, Kenneth, Padoan, Marina, Patel, Alpa V. , Ríboli, Elio , Severson, Richard K., Tinker, Lesley F. , Weinstein, Stephanie J. , Zheng, Tongzhang, Chanock, Stephen J., Rothman, Nathaniel , Berndt, Sonja I. , Teras, Lauren R , Wang, Zhaoming , Vajdic, Claire M , De Vivo, Immaculata , Boffetta, Paolo , Brooks-Wilson, Angela R , Canzian, Federico , Southey, Melissa C , Cerhan, James R , Berndt, Sonja I , Clavel, Jacqueline , Machiela, Mitchell J , Riboli, Elio , Kane, Eleanor , Panagiotou, Orestis A. , Doo, Nicole Wong , Slager, Susan L. , Vajdic, Claire M. , Vijai, Joseph , Giles, Graham G. , Link, Brian K. , Arslan, Alan A. , Salles, Gilles , Cozen, Wendy , Vivo, Immaculata De , Albanes, Demetrius , Bisanzi, Simonetta , Brennan, Paul E. , Brooks‐Wilson, Angela , Canzian, Federico , Conde, Lucía , Cox, David G. , Foretová, Lenka , Glimelius, Bengt , Habermann, Thomas M. , Hofmann, Jonathan N. , Lan, Qing , Lincoln, Anne , Maynadié, Marc , Melbye, Mads , Miligi, Lucia , Milne, Roger L. , Molina, Thierry Jo , Morton, Lindsay M. , North, Kari E. , Offit, Kenneth, Piro, Sara , Purdue, Mark P. , Ravichandran, Vignesh , Southey, Melissa C. , Staines, Anthony , Travis, Ruth C. , Wang, Sophia , Weiderpass, Elisabete , Rothman, Nathaniel , Birmann, Brenda M. , Cerhan, James R.

International Journal of Cancer | September 5, 2025 | Volume: 158 | Issue: 1 | Pages: 45-59

10.1002/ijc.70039 | PMID 40910475 Get It

Abstract Obesity has been associated with non‐Hodgkin lymphoma (NHL), but the evidence is inconclusive. We examined the association between genetically determined adiposity and four common NHL subtypes: diffuse large B‐cell lymphoma (DLBCL), follicular lymphoma, chronic lymphocytic leukemia, and marginal zone lymphoma, using eight genome‐wide association studies of European ancestry ( N = 10,629 cases, 9505 controls) and constructing polygenic scores for body mass index (BMI), waist‐to‐hip ratio (WHR), and waist‐to‐hip ratio adjusted for BMI (WHRadjBMI). Higher genetically determined BMI was associated with an increased risk of DLBCL [odds ratio (OR) per standard deviation (SD) = 1.18, 95% confidence interval (95% CI): 1.05–1.33, p = .005]. This finding was consistent with Mendelian randomization analyses, which demonstrated a similar increased risk of DLBCL with higher genetically determined BMI (OR per SD = 1.12, 95% CI: 1.02–1.23, p = .03). No significant associations were observed with other NHL subtypes. Our study demonstrates a positive link between a genetically determined BMI and an increased risk of DLBCL, providing additional support for increased adiposity as a risk factor for DLBCL.
High‐Power Short‐Duration Ablation Versus Conventional Power Ablation in Pulmonary Vein Isolation in Patients With Atrial Fibrillation: An Updated Systematic Review and Meta‐Analysis of Randomized Controlled Trials
Cabral, David C. B. I. , Rivera, André , Braga, Marcelo Antonio Pinheiro , Passos, Bárbara Mariz Ferreira, Ternes, Caique M. P. , Brígido, Alexandra Régia Dantas , Carvalho, Guilherme Dagostin de , Deshmukh, Abhishek , DeSimone, Christopher V. , Ferreira Félix, Iuri, de Carvalho, Guilherme Dagostin , Deshmukh, Abhishek J , DeSimone, Christopher V , Ternes, Caique M P , Félix, Iuri Ferreira , Rivera, A

Journal of Cardiovascular Electrophysiology | August 31, 2025 | Volume: 36 | Issue: 10 | Pages: 2620-2628

10.1111/jce.16735 | PMID 40886137 Get It

ABSTRACT Background High‐power short‐duration (HPSD) ablation has emerged as a promising alternative to conventional power delivery (CPD) for pulmonary vein isolation (PVI) among patients with atrial fibrillation (AF), though its efficacy, procedural efficiency, and safety profile remain uncertain. Aims To evaluate and compare the efficacy, procedural efficiency, and safety of HPSD versus CPD ablation strategies for PVI in patients with AF through a systematic review and meta‐analysis of randomized controlled trials (RCTs). Materials and Methods PubMed, Embase, Cochrane Library, and ClinicalTrials.Gov databases were systematically searched for RCTs comparing HPSD with CPD ablation for PVI in patients with AF. Random‐effects models were used to pool hazard ratios (HR) and risk ratios (RR) with 95% confidence intervals (CI). R version 4.4.2 was used for statistical analysis. Results Eight RCTs with 1094 patients (558 undergoing HPSD and 536 undergoing CPD ablation) were included. No significant differences were found in freedom from arrhythmia during the follow‐up period (HR: 0.77; 95% CI: 0.41–1.45; p = 0.424). AF recurrence did not differ (RR: 0.83; 95% CI: 0.59–1.16; p = 0.268) between groups. HPSD had a significantly shorter procedural (mean difference [MD]: −21.93 min; 95% CI: −31.34, −12.53; p < 0.001) and RF ablation times (MD: −13.87 min; 95% CI: −19.46, −8.27; p < 0.001). No differences were observed in fluoroscopy time and first‐pass isolation for right and left pulmonary veins. There was no difference in esophageal lesion rates, pericardial, or neurological complications, but there was a higher incidence of steam pops in HPSD (RR: 3.42; 95% CI: 1.45–8.09; p = 0.005). Discussion Although HPSD ablation did not significantly improve freedom from arrhythmia or reduce AF recurrence compared to CPD, it demonstrated enhanced procedural efficiency, with shorter procedure and RF ablation times. Despite the higher rate of steam pops, the overall safety profile was similar between both groups. Conclusion High‐power short‐duration ablation for pulmonary vein isolation in atrial fibrillation demonstrated comparable efficacy and safety to conventional power delivery, with the added benefit of shorter procedure and RF ablation times. However, HPSD ablation was associated with increased occurrence of steam pops.
Beyond platelet counts: assessing safety of postsplenectomy TPO-RA use in ITP
Alyamany, Ruah , Houghton, Damon E. , Sridharan, Meera , Pruthi, Rajiv K. , Shah, Surbhi , Wolanskyj-Spinner, Alexandra P , Houghton, Damon E , Sridharan, Meera , Godby, Richard , Wolanskyj, Alexandra P. , Go, Ronald S.

Blood Advances | August 28, 2025 | Volume: 9 | Issue: 22 | Pages: 5902-5912

10.1182/bloodadvances.2025017902 | PMID 40875595 Get It

Abstract Immune thrombocytopenia (ITP) carries an increased risk of thrombosis, which may be further amplified by splenectomy and thrombopoietin receptor agonists (TPO-RAs). Although each intervention has been individually studied for its thrombotic risk, data are lacking on the safety of postsplenectomy TPO-RA use. We conducted a retrospective cohort study of adult patients with ITP who underwent splenectomy between 2011 and 2024. Patients were stratified on the basis of postsplenectomy TPO-RA use. The primary outcome was incidence of thrombosis. Secondary outcomes included bleeding, mortality, and hematologic response. Time-to-event analyses and multivariate Cox regression were performed. Among 88 patients, 37 (42%) patients received TPO-RAs after splenectomy. Thrombosis occurred in 17 patients in the TPO-RA group vs 14 patients in the non–TPO-RA group (P = .07). The 10-year cumulative incidence of thrombosis was numerically higher in the TPO-RA group (57% vs 36%), with clustering of events within the 3 months of postsplenectomy TPO-RA initiation. Venous events predominated; arterial events were rare. No significant differences were observed in bleeding or mortality rates between groups. Platelet counts alone did not independently affect bleeding or thrombosis. TPO-RA use after splenectomy was not significantly associated with increased thrombosis risk. However, early initiation may coincide with a high-risk period, and the sustained numerical difference in cumulative incidence throughout follow-up highlights potential clinical relevance. These findings support the need for individualized thromboprophylaxis and prospective evaluation of TPO-RA safety in this setting.
Validation of a Novel Patient-Reported Measure of The Burden of Digital Care in Diabetes
Zahidy, Misk Al, Maldonado, Kerly Guevara, Simha, Sue, Herzog, Alexandra, Hougen, Jada, Borras-Osorio, Mariana, Tran, Viet‐Thi , Guevara, Kerly , Branda, Megan E. , Ridgeway, Jennifer L. , Herzog, Alexandra, Hougen, Jada, Tran, Viet-Thi , Montori, Víctor M.

No container title available | August 20, 2025 | Volume: No volume available | Issue: No issue available | Pages: No page available

10.21203/rs.3.rs-7265768/v1 | PMID 40894032 Get It

Abstract Background Patients living with diabetes and chronic conditions may face significant burden managing their health. Many of these patients use digital medicine tools such as continuous glucose monitoring systems. Although measures exist to assess treatment burden from tasks such as managing medications and attending healthcare visits, there is no patient-reported measure that captures the burden of digital care. Therefore, the purpose of this study is to validate the Treatment Burden Questionnaire Plus Digital (TBQ + D), a patient-reported measure of treatment burden that includes using digital tools for adults with diabetes. Methods Adult patients with type 1 or type 2 diabetes mellitus completed the 25-item TBQ + D (scored 0 [none] to 10 [maximum] per item; total score range 0–250). We evaluated ease of administration, internal consistency, and tested hypotheses about the relationship between TBQ + D scores and treatment complexity, digital tool use intensity, social risk factors, and digital comfort to assess TBQ + D’s validity. Results Of 324 patients approached, 300 (93%) consented and completed the TBQ + D (mean age 57 [SD 17]; 50% female; 50% with type 2). The mean TBQ + D score was 53.7 (SD 41.6). Internal consistency was excellent (Cronbach’s α = 0.94). As hypothesized, higher TBQ + D scores were reported by patients with type 1 vs. type 2 diabetes mellitus (61.7 vs. 45.7; p = .0008), maximal/moderate vs. minimal to no digital tool use (56.5/60.7 vs. 41.3; p = .001), those on intensive insulin therapy vs. other treatments (61.4 vs. 38.0; p < .0001), and those with greater social vulnerability (p < .0106). TBQ + D scores were not significantly higher in patients with HbA1c ≥ 8% (p = .055) or less comfortable with digital technology (p = .08). Conclusions TBQ + D is a novel and valid measure of treatment burden in patients living with diabetes, inclusive of digital burden, that can play a role in fostering minimally disruptive care for patients with diabetes.
Connectivity as a universal predictor of tau progression in atypical Alzheimer’s disease
Bruin, Hannah de , Groot, Colin , Barthel, Henryk , Bischof, Gérard N. , Boon, Baayla D.C. , Brendel, Matthias , Cash, David M. , Coath, William , Day, Gregory S. , Dyck, Christopher H. van , Fredericks, Carolyn , Fryer, Tim D. , Graff‐Radford, Jonathan , Hobbs, Diana A. , Hoenig, Merle C. , Josephs, Keith A. , Katsumi, Yuta , Joie, Renaud La , Xiong, Chengjie , Malpetti, Maura , McGinnis, Scott M., Mecca, Adam P. , O’Brien, John T. , Putcha, Deepti , Rabinovici, Gil D. , Rahmouni, Nesrine , Rullmann, Michael , Saur, Dorothee , Servaes, Stijn , Sintini, Irene , Stevenson, Jenna , Stomrud, Erik , Strandberg, Olof, Tideman, Pontus , Touroutoglou, Alexandra , Trainer, Anne, Wekselman, Fattin, Weston, Philip S.J. , Whitwell, Jennifer L. , Yong, Keir , de Bruin, Hannah , Brendel, Matthias , Cash, David M , Coath, William , Dickerson, Bradford Clark , van Eimeren, Thilo , van der Flier, Wiesje M , Fredericks, Carolyn A , Gordon, Brian A , Graff-Radford, Jonathan , Grinberg, Lea , Hansson, Oskar , Irwin, David J , Josephs, Keith A , Katsumi, Yuta , La Joie, Renaud , Lee, Edward B , Xiong, Chengjie , Malpetti, Maura , Mohanty, Rosaleena , O'Brien, John Tiernan , Palleis, Carla , Phillips, Jeffrey S , Putcha, Deepti , Rosa-Neto, Pedro , Schott, Jonathan M , Schroeter, Matthias L , Smith, Ruben , Spina, Salvatore , Therriault, Joseph , Whitwell, Jennifer , Yong, Keir X X , Franzmeier, Nicolai , Day, Gregory S , Stomrud, Erik , Rabinovici, Gil D , Blazhenets, Ganna , Boellaard, Ronald , Doering, Elena , Drzezga, Alexander E. , Flier, Wiesje M. van der , Giessen, Elsmarieke van de , Gordon, Brian A. , Grinberg, Lea T. , Hansson, Oskar , Höglinger, Günter U. , Irwin, David J. , Jones, Peter Simon , Lee, Edward B. , Mohanty, Rosaleena , Nasrallah, Ilya M. , O’Dell, Ryan S. , Perneczky, Robert , Rowe, James B. , Sabri, Osama , Schildan, Andreas , Schott, Jonathan M. , Seeley, William W. , Servaes, Stijn , Spina, Salvatore , Visser, Denise , Wolk, David A. , Pijnenburg, Yolande A.L. , Franzmeier, Nicolai , Ossenkoppele, Rik

Brain | August 8, 2025 | Volume: 148 | Issue: 11 | Pages: 3893-3912

10.1093/brain/awaf279 | PMID 40810361 Get It

Abstract The link between regional tau load and clinical manifestation of Alzheimer’s disease (AD) highlights the importance of characterizing spatial tau distribution across disease variants. In typical (memory-predominant) AD, the spatial progression of tau pathology mirrors the functional connections from temporal lobe epicentres. However, given the limited spatial heterogeneity of tau in typical AD, atypical (non-amnestic-predominant) AD variants with distinct tau patterns provide a key opportunity to investigate the universality of connectivity as a scaffold for tau progression. In this large-scale, multicentre study across 14 international sites, we included cross-sectional tau-PET data from 320 individuals with atypical AD (n = 139 posterior cortical atrophy/PCA-AD; n = 103 logopenic variant primary progressive aphasia/lvPPA-AD; n = 35 behavioural variant AD/bvAD; n = 43 corticobasal syndrome/CBS-AD), with a subset of individuals (n = 78) having longitudinal tau-PET data. Additionally, as an independent sample, we included regional post-mortem tau stainings from 93 atypical AD patients from two sites (n = 19 PCA-AD, n = 32 lvPPA-AD, n = 23 bvAD, n = 19 CBS-AD). Gaussian mixture modelling was used to harmonize different tau-PET tracers by transforming tau-PET standardized uptake value ratios to tau positivity probabilities (a uniform scale ranging from 0% to 100%). Using linear regression, we assessed whether brain regions with stronger resting-state functional MRI-based functional connectivity, derived from healthy elderly controls in the Alzheimer’s Disease Neuroimaging Initiative (ADNI), showed greater covariance in cross-sectional and longitudinal tau-PET and post-mortem tau pathology. Furthermore, we examined whether functional connectivity of tau-PET epicentres (i.e. the top 5% of regions with the highest baseline tau load) and tau-PET accumulation epicentres (i.e. the top 5% of regions with the highest tau accumulation rates) was associated with cross-sectional and longitudinal tau patterns. Our findings show that tau-PET epicentres aligned with clinical variants, e.g. a visual network predominant pattern in PCA-AD (‘visual AD’) and left-hemispheric temporal predominance, particularly within the language network, in lvPPA-AD (‘language AD’). Moreover, more strongly functionally connected regions showed correlated concurrent tau-PET levels (confirmed with post-mortem data) and tau-PET accumulation rates. The functional connectivity profile of tau-PET epicentres and accumulation epicentres corresponded to tau-PET progression patterns, with higher tau-PET levels and accumulation rates in functionally close regions, and lower tau-PET levels and accumulation rates in functionally distant regions. Our data are consistent with the hypothesis that tau propagation occurs along functional connections originating from local epicentres, across all AD clinical variants. Since tau proteinopathy is a major driver of neurodegeneration and cognitive decline, this finding may advance personalized medicine and participant-specific end points in clinical trials.