Publications by authors named "Stock P"

Background: In November 2023, in the context of the Spanish Presidency of the Council of the European Union, the Organization National de Transplante organized a global summit discussing global action in transplantation for the next decade. This article reports the recommendations supporting the need to prioritize transplantation in healthcare systems.

Methods: The working group investigated how transplantation addresses noncommunicable disease mortality, particularly related to kidney and liver disease.

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  • Kidney transplantation from HIV-positive donors to HIV-positive recipients is a growing practice, initiated under a 2016 U.S. law, and is currently being evaluated for broader clinical implementation.
  • An observational study involving 408 candidates at 26 U.S. centers assessed the safety and health outcomes of kidney transplants from both HIV-positive and HIV-negative donors to HIV-positive recipients, finding no significant difference in major health risks between the two donor groups.
  • Results indicated similar long-term survival rates, graft success, and complication rates across both groups, although recipients of kidneys from HIV-positive donors showed a higher incidence of HIV breakthrough infections.
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  • Pancreas transplantation can enhance blood sugar control and reduce death rates in diabetes patients, but it requires strong immunosuppressive drugs to combat immune responses.
  • The study evaluated the effectiveness of the tissue Common Response Module (tCRM) score and other biomarkers in assessing acute cellular rejection in pancreas transplants.
  • Analysis of pancreas biopsies revealed significant gene expression changes linked to rejection severity, indicating that higher tCRM scores correlate with more severe rejection, and can differentiate between treatment-resistant and successfully treated cases.
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This study aimed to investigate the effects of documentation status on pediatric kidney transplant outcomes in a single-center setting, emphasizing the significance of state insurance access for undocumented patients and federal policies like Deferred Action for Childhood Arrivals (DACA) on patient outcomes. A cohort of 283 patients, including 48 undocumented individuals, who received their first kidney transplant as children between 1998 and 2011 was analyzed. There was no significant difference in unadjusted all-cause (P = .

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Background: Although kidney transplantation (KT) has become the standard of care for people living with HIV (PLWH) suffering from renal failure, early experiences revealed unanticipated higher rejection rates than those observed in HIV- recipients. The cause of increased acute rejection (AR) in PLWH was assessed by performing a transcriptomic analysis of biopsy specimens, comparing HIV+ to HIV- recipients.

Methods: An analysis of 68 (34 HIV+, 34 HIV-) formalin-fixed paraffin-embedded (FFPE) renal biopsies matched for degree of inflammation was performed from KT recipients with acute T cell-mediated rejection (aTCMR), borderline for aTCMR (BL), and normal findings.

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Extended liver resection carries the risk of post-surgery liver failure involving thrombospondin-1-mediated aggravation of hepatic epithelial plasticity and function. Mesenchymal stromal cells (MSCs), by interfering with thrombospondin-1 (THBS1), counteract hepatic dysfunction, though the mechanisms involved remain unknown. Herein, two-thirds partial hepatectomy in mice increased hepatic THBS1, downstream transforming growth factor-β3, and perturbation of liver tissue homeostasis.

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The postpandemic recovery did not occur in pancreas transplantation as in other organs. The number of pancreas transplants in the United States decreased to 918 in 2022 from 963 in 2021. The number of simultaneous pancreas-kidney transplants decreased to 810 in 2022 from 820 in 2021, but the largest decrease was in pancreas transplant alone: 62 in 2022 compared with 92 in 2021.

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Global conflicts and humanitarian crises have resulted in an unprecedented number of refugees and migrants. This challenges the limited resources of health care systems and jeopardizes the availability of transplant care for these deserving migrants and refugees. This was the basis for a workshop held during the Congress of the Transplantation Society (Buenos Aires, 2022).

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Background: Kidney transplant (KT) candidates with HIV face higher mortality on the waitlist compared with candidates without HIV. Because the HIV Organ Policy Equity (HOPE) Act has expanded the donor pool to allow donors with HIV (D + ), it is crucial to understand whether this has impacted transplant rates for this population.

Methods: Using a linkage between the HOPE in Action trial (NCT03500315) and Scientific Registry of Transplant Recipients, we identified 324 candidates listed for D + kidneys (HOPE) compared with 46 025 candidates not listed for D + kidneys (non-HOPE) at the same centers between April 26, 2018, and May 24, 2022.

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  • CD47 is a protein on cells that helps control how immune cells eat up bad stuff, like cancer cells.
  • Scientists tested blocking CD47 to help immune cells do their job better in cancer and heart damage cases.
  • The study found that blocking CD47 not only helped immune cells remove cancer cells but also helped them clean up dead heart cells after a heart attack, showing they work better together.
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Globally, climate change is leading to environmental crises, which activists have been fighting against for decades. Social scientists have rarely considered older adults as environmentalists and their feelings about climate change. Most studies focus on younger people's emotions or concerns about environmental crises.

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Advances in antiretroviral and immunosuppressive regimens have improved outcomes following solid organ transplantation in people living with HIV (PLWH). The HIV Organ Policy and Equity Act was conceived to reduce the discard of HIV-positive organs and improve access to transplant for PLWH. Nevertheless, PLWH continue to experience disproportionately low rates of transplant.

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  • Long-term success of beta-cell replacement is hindered by the toxic effects of calcineurin inhibitors (CNI) on beta-cells and kidney function.
  • A study was conducted on 10 Type 1 diabetes patients who received islet transplants with either belatacept or efalizumab for immunosuppression, with 70% of them remaining insulin-independent after 10 years.
  • Although patients generally maintained their kidney function, those undergoing pancreas-after-islet (PAI) transplants experienced more significant renal impairment due to CNI, and repeat islet transplants did not effectively sustain long-term insulin independence.
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Bacterial pleural infections are associated with high mortality. Treatment is complicated due to biofilm formation. A common causative pathogen is ().

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  • The number of pancreas transplants in the U.S. remained stable in 2021, with 963 transplants, indicating a slower recovery from COVID-19 compared to other organs.
  • Simultaneous pancreas-kidney transplants slightly decreased, while pancreas-after-kidney transplants and standalone pancreas transplants saw a slight increase; type 2 diabetes patients made up a larger percentage of both the waiting list and successful transplants.
  • There was a significant rise in transplants performed at medium-volume centers, while large-volume centers saw a drop, and outcomes for simultaneous pancreas-kidney transplants continued to be the best among the various transplant categories.
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Cancer survival rates have increased significantly because of improvements in therapy regimes and novel immunomodulatory drugs. Recently, combination therapies of anthracyclines and immune checkpoint inhibitors (ICIs) have been proposed to maximize neoplastic cell removal. However, it has been speculated that a priori anthracycline exposure may prone the heart vulnerable to increased toxicity from subsequent ICI therapy, such as an anti-programmed cell death protein 1 (PD1) inhibitor.

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Background: Food is one of the most common elicitors of anaphylaxis, with an increasing incidence over recent years.

Objectives: To characterize elicitor-specific phenotypes and identify factors enhancing the risk or severity of food-induced anaphylaxis (FIA).

Methods: We analyzed data from the European Anaphylaxis Registry applying an age- and sex-matched analysis of associations (Cramer's V) for single food triggers and calculated odds ratios (ORs) for severe FIA.

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Although rare, infection and vaccination can result in antibodies to human leukocyte antigens (HLA). We analyzed the effect of SARS-CoV-2 infection or vaccination on HLA antibodies in waitlisted renal transplant candidates. Specificities were collected and adjudicated if the calculated panel reactive antibodies (cPRA) changed after exposure.

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  • Eye-tracking technology is being explored as a method to assess and monitor sport-related concussions (SRC), specifically using the King-Devick Eye Tracking (K-D ET) assessment.
  • The study involved collegiate rugby players, measuring various eye movement metrics to differentiate between concussed and non-concussed athletes, revealing significant differences in total saccades and fixation characteristics.
  • Although the K-D ET showed high specificity in detecting SRC, its low sensitivity indicates limitations in accurately identifying all cases of concussion.
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Dr John S Najarian (1927-2020), chairman of the Department of Surgery at the University of Minnesota from 1967 to 1993, was a pioneer in surgery, clinical immunology and transplantation. A Covid-delayed Festschrift was held in his honor on May 20, 2022. The speakers reflected on his myriad contributions to surgery, transplantation, and resident/fellow training, as well as current areas of ongoing research to improve clinical outcomes.

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