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Reduced levels of mitochondrial ribosomal protein <i>MRPL54</i> does not alter Apc related adenoma formation

by Claudia N. Spaan, Eileen Daniels, Wouter L. Smit, Ruben J. de Boer, Joana Silva, Jacqueline L. M. Vermeulen, S. Meisner, Vanesa Muncan, Riekelt H. Houtkooper, Jarom Heijmans

Reprogramming of energy metabolism is one of the hallmarks of cancer cells and mutations that modify wild type intestinal cells to colon carcinomas increases cellular energy expenditure. Mitochondria are the main site for ATP production in (cancer) cells and disrupting their function results in impaired tumor forming efficacy. The mitochondrial ribosomal proteins (MRPs) constitute the ribosome specifically in mitochondria, and as such are crucial for the translation process of the electron transport chain complex subunits. We hence aimed to explore the consequence of reduced MRP expression on adenomagensis and investigate this in a genetic mouse model with bodywide heterozygosity for Mrpl54. We show that Mrpl54 heterozygosity does not alter adenoma formation, intestinal proliferation or apoptosis in a heterozygous Apc model. Furthermore, diminished Mrpl54 expression did not decrease stemness or global parameters of metabolism in colorectal cancer cell lines.

Delivering hospital care at home in a Dutch Tertiary University Hospital: protocol for a prospective feasibility cohort study evaluating a Virtual Ward for early discharge of inpatients

Por: van Herwerden · M. C. · Scholte · N. T. B. · Mkrtchjan · A. · Feyz · L. · Mol · A. P. · Aitken · J. · de Boer · R. A. · Chandoesing · P. P. · Gommers · D. A. M. P. J. · De Haan · B. · Den Hoed · C. M. · van den Hoogen · M. W. F. · Peeters · R. P. · Wlazlo · N. · Van Der Boon · R. M.
Introduction

Virtual Wards (VWs) facilitate hospital-level monitoring, diagnostics and treatment within patients’ homes, while the hospital team retains responsibility for care. International research indicates that VWs decrease hospital length of stay without increasing readmissions; however, the feasibility and key operational determinants within Dutch care remain uncertain. This protocol outlines the VW for Early Discharge in Patients Receiving Inpatient Care (VIP Care) study.

Methods and analysis

The VIP Care study is a single-centre prospective feasibility cohort study conducted at Erasmus University Medical Center (Erasmus MC), Rotterdam, the Netherlands. The study encompasses seven predefined subcohorts with n=51 eligible patients per subcohort: (1) bacterial, fungal or parasitic infections; (2) viral respiratory infections; (3) dehydration; (4) decompensated heart failure; (5) high-dose corticosteroid treatment; (6) post-transsphenoidal pituitary surgery follow-up and (7) severe inflammatory skin disease with or without bacterial or viral superinfection. Adults who require hospital-level monitoring and/or therapy may qualify for early discharge to the VW.

The VW integrates scheduled, patient-performed measurements using (European Conformity) CE-marked devices with structured symptom assessment submitted via a patient application, and data review in an electronic health record-integrated clinician cockpit. Submissions are evaluated by VW tele-nurses using prespecified Early Warning Score based thresholds and an escalation protocol. Patients receive a daily physician telephone review. Diagnostics and treatments are administered at home to hospital standards through established home-care services.

The primary outcome (feasibility) is adherence to transfer, defined as the proportion of eligible inpatients who provide written informed consent and are subsequently successfully transferred to the VW. The prespecified feasibility threshold is 30%. Secondary outcomes include reach (eligibility, invitation and consent rates among admitted patients), operational performance during the VW episode (alert frequency and handling, contact volumes and actions), length of stay on the ward and in the VW, emergency department reassessments and 30-day readmissions. Qualitative interviews will be conducted to identify implementation determinants.

Ethics and dissemination

The study received approval from the Erasmus MC Medical Ethics Committee (MEC-2024–0060; amendment MEC-2024–0060 A0001). Incremental risk is considered minimal. Written informed consent is obtained. Findings will be disseminated through peer-reviewed publications, conference presentations and an accessible lay summary.

Trial registration number

ClinicalTrials.gov NCT06936891; CCMO NL85516.078.24. Recruitment began in May 2025 and is ongoing.

Randomised controlled trial of laparoscopic primary crural repair versus additional circular bioabsorbable mesh reinforcement in hiatal hernia (PRIME-II trial): an RCT protocol

Por: de Haas · J. W. A. · Geerts · J. H. · de Boer · E. · Brohet · R. M. · Hazebroek · E. J. · Wassenaar · E. B. · Nieuwenhuijs · V. B.
Introduction

Laparoscopic hiatal hernia (HH) repair is associated with a high recurrence rate. Repair reinforced with mesh lowers short-term recurrence but can cause dysphagia and visceral erosion. Results of the PRIME trial, in which non-absorbable mesh reinforcement of the posterior crural repair was investigated, showed equal recurrence compared with primary suture repair after 6 months. This study investigates the use of circular absorbable mesh reinforcement in primary HH repair.

Methods and analysis

Prospective double-blinded randomised controlled superiority trial comparing two laparoscopic procedures for HH repair (110 vs 110). Adult patients with proven HH Skinner types II–IV (defined by preoperative CT scan) are included. Patients are randomised to undergo a laparoscopic primary crural repair with sutures alone or suture repair augmented with biosynthetic absorbable, circular mesh at the hiatus. Radiologic integrity of the hiatal repair 1 year after surgery is the main endpoint. Secondary objectives are clinical recurrence of the hernia, development of postoperative reflux disease, postoperative side effects and satisfaction with surgical outcome. Outcome assessors are blinded to allocation. Data are collected at baseline, and follow-up includes interviews and digital questionnaires at 3, 12, 24, 36, 48 and 60 months, as well as CT scan at 12 and 60 months. All patients randomised will be analysed according to the intention-to-treat principle.

Ethics and dissemination

Ethics approval has been obtained by the local ethics committee at Isala, Zwolle, the Netherlands (Medical Ethics Review Committee (METc) Isala, study number: 190516). METc Isala is no longer active; all duties have been taken over by METc of the University Medical Center Groningen. The trial’s results will be submitted to a peer-reviewed international journal as well as (inter)national conferences.

Trial registration number

Registered in the Dutch national trial registry: OMON (NL-OMON48062).

Transtympanic sodium thiosulphate to prevent cisplatin-related hearing loss: a protocol for randomised controlled multicentre phase III trial, the SOUND trial

Por: Burger · A. V. M. · Duinkerken · C. W. · Jansen · J. C. · Keereweer · S. · Cals · F. L. · Stokroos · R. J. · de Boer · J. P. · Exterkate · L. · van der Velden · L.-A. · Hoetink · A. E. · Nuijen · B. · Hauptmann · M. · van Sluis · K. E. · Bruintjes · T. D. · Zuur · C. L.
Introduction

Cisplatin is a widely used chemotherapeutic anti-cancer drug. However, high-dose cisplatin is also known for its dose-limiting toxicities, including irreversible cisplatin-induced hearing loss (CIHL). Sodium thiosulphate (STS) can bind to cisplatin to form an inactive and harmless complex. A topical application is desired, allowing cisplatin to retain its systemic anti-cancer effect.

Methods and analysis

The SOUND trial is an investigator-initiated randomised controlled multicentre phase III trial to study the efficacy of transtympanic administration of STS against CIHL in a cohort of 100 patients with head and neck cancer treated with cisplatin at a dose of ≥200 mg/m2. Each subject will receive transtympanic STS injections in one ear, chosen by randomisation, before each cisplatin infusion. The contralateral ear serves as an internal control. The primary objective is efficacy (ie, clinically relevant benefit) of transtympanic STS injections against CIHL, defined as a difference in threshold shift of ≥10 decibels between baseline and 3 months after treatment in favour of the STS-treated ear. Secondary objectives include the difference in mean threshold shifts on frequencies essential for speech and extended high frequencies, as well as the difference between both ears in the gradation of hearing loss as defined by ototoxicity grading scales.

Ethics and dissemination

The medical ethics committee in the Netherlands approved the trial (Clinical Trials Information System (CTIS) 2023-503313-30-00). The results will be disseminated through the CTIS and peer-reviewed scientific journals.

Trial registration number

CTIS 2023-503313-30-00 approved by Medical Research Ethics Committee NedMec.

NEOadjuvant Dendritic cell therapy added to first line standard of care in advanced epithelial Ovarian Cancer (NEODOC): protocol of a first-in-human, exploratory, single-centre phase I/II trial in the Netherlands

Por: Koeneman · B. · Schreibelt · G. · Duiveman - de Boer · T. · Bos · K. · van Oorschot · T. · Pots · J. · Scharenborg · N. · de Boer · A. · Hins - de Bree · S. · de Haas · N. · de Goede · A. · Westdorp · H. · van Ham · M. · de Vries · I. J. M. · Ottevanger · P. B.
Introduction

The currently available immunotherapies have failed to meet expectations in inducing durable responses in patients with advanced epithelial ovarian cancer (EOC). The low number of somatic missense mutations in EOC necessitates highly potent neoantigen-directed approaches. To this end, we have developed a novel dendritic cell (DC) product that consists of a specialised cross-presenting subset of DC, conventional DC type 1 (cDC1).

Methods and analysis

We will conduct the NEODOC study, an investigator-initiated first-in-human phase I/II trial. This study will assess the immunogenicity, safety and feasibility of a cDC1-based, autologous tumour lysate-loaded, DC product. 10 patients with previously untreated advanced EOC (stage IIIb-c, IVa or stage IVb if only supradiaphragmatic or inguinal lymph nodes

Ethics and dissemination

Ethical approval for this trial was granted by the Netherlands Central Committee on Research Involving Human Subjects. The results will be disseminated through publications in international, open-access scientific journals and presentations at scientific conferences.

Trial registration number

NCT05773859; EUCT number 2024-512353-24-01.

Evaluation of an intervention to increase topical sunscreen use in German outdoor workers: study protocol for the non-randomised controlled intervention study ProtExSun

Por: Dick · A. · Rocholl · M. · Ludewig · M. · Skudlik · C. · Jakasa · I. · Kezic · S. · de Boer · F. · van der Molen · H. F. · John · S. M.
Introduction

Squamous cell carcinoma and multiple actinic keratoses caused by solar ultraviolet radiation (UVR) are among the most frequently recognised occupational diseases in Germany. Employees who regularly work outdoors, for example, in the construction industry, agriculture, forestry and gardening, are at a higher risk of developing occupational skin cancer. However, sun-safety behaviour in outdoor workers is currently insufficient. Therefore, this study aims to investigate the effectiveness of an intervention to increase sunscreen use among outdoor workers.

Methods and analysis

In this non-randomised, controlled intervention study, 234 outdoor workers from different companies in industries with outdoor working activities based in Germany will be included. The study population, aged 18 years and above, has to be intensively exposed to solar UVR of regularly 1 hour or more per day. The intervention group will receive a sunscreen package as well as health education. The control group follows the practice in their companies (‘treatment-as-usual’). At the beginning of the study, after 3 months and at the end of the study (after 6 months), both groups filled in different questionnaires. In addition, stratum corneum (SC) samples will be collected at the beginning and after 3 months. The primary outcome—increase in the frequency of sunscreen use during work and in leisure time—will be assessed from data on self-reported sunscreen use. The secondary outcomes include sun protection behaviour, knowledge about sun protection and skin cancer, and acceptance of the provided sunscreens. Further secondary outcomes include internal UV dose and UV-related immune response, determined by the levels of SC biomarkers. Data will be analysed using both descriptive and inferential methods.

Ethics and dissemination

The study protocol followed the principles of the Declaration of Helsinki (2013) and was approved by the Ethics Committee of Osnabrück University, Germany (reference Ethik-37/2024). Study results will be disseminated through peer-reviewed publications and conference presentations.

Trial registration number

DRKS00035178.

Comparison of outpatient attendance, cardiovascular risk management and cardiovascular health across preCOVID-19, during and postCOVID-19 periods: a prospective cohort study

Por: Zondag · A. G. M. · Haitjema · S. · de Groot · M. C. H. · de Boer · A. R. · van Solinge · W. W. · Bots · M. L. · Vernooij · R. W. M.
Objective

During the COVID-19 pandemic, a substantial decrease was observed in hospital admissions and in-hospital procedures for patients with acute cardiovascular diseases (CVDs). The extent to which measures to prevent COVID-19 transmission, for example, lockdowns, affected the outpatient care of patients at higher cardiovascular risk remains unclear. We aimed to compare outpatient department (OPD) attendance, cardiovascular risk management (CVRM) and cardiovascular health (CVH) of patients at higher cardiovascular risk referred to an OPD of a tertiary care centre between preCOVID-19, during and postCOVID-19 periods.

Design, setting and participants

We included all adult patients at higher cardiovascular risk referred to the cardiology, vascular medicine, diabetology, geriatrics, nephrology or multidisciplinary vascular surgery OPDs of the University Medical Centre Utrecht, the Netherlands, between March 2019 and December 2022, in a prospective cohort study.

Main outcome measures

We assessed trends in the number of first and follow-up appointments and in the completeness of extractable CVRM indicators from the electronic health record (EHR) as a proxy for CVRM guideline adherence. CVH was determined using the Life’s Essential 8 metric (score 0–100, the higher score, the better). We investigated whether CVH differed between COVID-19 periods compared with the reference period (ie, 2019) and stratified by OPDs, using multivariable linear regression, adjusted for age, gender, CVD history and whether the patient had a previous appointment before the reference period.

Results

Among 15 143 patients, we observed a 33% reduction in the weekly number of first appointments during the COVID-19 pandemic, with the largest reductions in the cardiology and nephrology OPDs, with no differences between women and men. Follow-up appointments conducted remotely, compared with before the COVID-19 pandemic, increased significantly for all OPDs. CVRM indicators were up to 11% less extractable during the first lockdown yet returned to prepandemic levels directly after the first lockdown period. The CVH score of patients visiting the nephrology, vascular medicine and geriatrics OPDs during the first lockdown was 11.23 (95% CI 2.74 to 19.72), 5.68 (95% CI 0.82 to 10.54) and 5.66 (95% CI 0.01 to 11.31) points higher, respectively, compared with the prepandemic period. In between the second and third lockdowns, the CVH score was comparable to the preCOVID reference period, yet for the cardiology OPD it was significantly higher (5.54, 95% CI 2.04 to 9.05).

Conclusions

During the COVID-19 pandemic, weekly numbers of first appointments to OPDs decreased, and a population with a higher CVH score (ie, better CVH) visited certain OPDs, especially during the first lockdown period. These suggest that patients with poorer CVH more often avoided or were unable to visit OPDs, which might have resulted in missed opportunities to control cardiovascular risk factors and potentially may have led to preventable disease outcomes. For future epidemics and pandemics, it seems vital to develop a strategy that includes an emphasis on seeking healthcare when needed, with specific attention to patients at higher CVD risk.

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