Publications by authors named "Maite Herraiz"

Background: Computer-aided detection (CADe) systems for colonoscopy have been shown to increase small polyp detection during colonoscopy in the general population. People with Lynch syndrome represent an ideal target population for CADe-assisted colonoscopy because adenomas, the primary cancer precursor lesions, are characterised by their small size and higher likelihood of showing advanced histology. We aimed to evaluate the performance of CADe-assisted colonoscopy in detecting adenomas in individuals with Lynch syndrome.

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Age-related neurodegenerative diseases involving amyloid aggregation remain one of the biggest challenges of modern medicine. Alterations in the gastrointestinal microbiome play an active role in the aetiology of neurological disorders. Here, we dissect the amyloidogenic properties of biofilm-associated proteins (BAPs) of the gut microbiota and their implications for synucleinopathies.

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Background And Objective: Different factors may influence colonoscopy performance measures. We aimed to analyze procedure- and endoscopist-related factors associated with detection of colorectal lesions and whether these factors have a similar influence in the context of different colonoscopy indications: positive fecal immunochemical test (+FIT) and post-polypectomy surveillance colonoscopies.

Methods: This multicenter cross-sectional study included adults aged 40-80 years.

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Background: Mismatch repair (MMR) deficiency is the hallmark of tumours from Lynch syndrome (LS), sporadic MLH1 hypermethylated and Lynch-like syndrome (LLS), but there is a lack of understanding of the variability in their mutational profiles based on clinical phenotypes. The aim of this study was to perform a molecular characterisation to identify novel features that can impact tumour behaviour and clinical management.

Methods: We tested 105 MMR-deficient colorectal cancer tumours (25 LS, 35 LLS and 45 sporadic) for global exome microsatellite instability, cancer mutational signatures, mutational spectrum and neoepitope load.

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Background & Aims: There is a lack of clinical studies to establish indications and methodology for tattooing, therefore technique and practice of tattooing is very variable. We aimed to establish a consensus on the indications and appropriate techniques for colonic tattoo through a modified Delphi process.

Methods: The baseline questionnaire was classified into 3 areas: where tattooing should not be used (1 domain, 6 questions), where tattooing should be used (4 domains, 20 questions), and how to perform tattooing (1 domain 20 questions).

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Article Synopsis
  • The "diagnose-and-leave-in" policy aims to lower risks and costs linked to unnecessary polypectomies in the average-risk population but recommends removing all polyps in individuals with Lynch syndrome due to their higher cancer risk.
  • A study analyzed data from a clinical trial involving 256 Lynch syndrome patients, using advanced visual techniques to assess diminutive rectosigmoid lesions before making decisions about polypectomy.
  • Results indicated that this strategy could safely avoid 59% of unnecessary polypectomies, suggesting it's a feasible approach for managing diminutive polyps in Lynch syndrome patients.
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Introduction: obscure gastrointestinal bleeding is defined as bleeding from a source that cannot be identified on upper or lower gastrointestinal endoscopy and capsule endoscopy is the next step in these patients. Some patients may be unsuitable for conventional endoscopy and performing a capsule panendoscopic test as a first line procedure might potentially reduce the number of endoscopies and their subsequent risk.

Aim: to analyze our experience with capsule endoscopy in the bleeding setting.

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Background & Aims: Colonoscopy reduces colorectal cancer (CRC) incidence and mortality in Lynch syndrome (LS) carriers. However, a high incidence of postcolonoscopy CRC (PCCRC) has been reported. Colonoscopy is highly dependent on endoscopist skill and is subject to quality variability.

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Article Synopsis
  • - Lynch syndrome (LS) is a major hereditary cause of colorectal cancer (CRC), while Lynch-like syndrome (LLS) occurs in CRC patients who show mismatch repair deficiency but lack specific germline mutations.
  • - A study compared the risk of CRC and other neoplasms in first-degree relatives (FDRs) of patients with LS and LLS, finding that FDRs of LLS patients had a significantly lower risk of CRC compared to those with LS.
  • - Despite the lower risk, FDRs of LLS patients still face an increased likelihood of developing CRC and LS-related cancers, highlighting the need for tailored management strategies for these families.
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Background & Aims: Dye-based pancolonic chromoendoscopy is recommended for colorectal cancer surveillance in patients with Lynch syndrome. However, there is scarce evidence to support its superiority to high-definition white-light endoscopy. We performed a prospective study assess whether in the hands of high detecting colonoscopists, high-definition, white-light endoscopy is noninferior to pancolonic chromoendoscopy for detection of adenomas in patients with Lynch syndrome.

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Background & Aims: Most fulfillment and benchmarking information for colonoscopy quality indicators has been obtained from studies of primary screening colonoscopies. We analyzed differences in the fulfillment of colonoscopy quality indicators based on the indication for endoscopy.

Methods: We performed an observational, multicenter, cross-sectional study of 14,867 patients who underwent endoscopy procedures for gastrointestinal symptoms (40.

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Background & Aims: Lynch syndrome is characterized by DNA mismatch repair (MMR) deficiency. Some patients with suspected Lynch syndrome have DNA MMR deficiencies but no detectable mutations in genes that encode MMR proteins-this is called Lynch-like syndrome (LLS). There is no consensus on management of patients with LLS.

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There is limited scientific evidence available to stratify the risk of developing metachronous colorectal cancer after resection of colonic polyps and to determine surveillance intervals and is mostly based on observational studies. However, while awaiting further evidence, the criteria of endoscopic follow-up needs to be unified in our setting. Therefore, the Spanish Association of Gastroenterology, the Spanish Society of Family and Community Medicine, the Spanish Society of Digestive Endoscopy, and the Colorectal Cancer Screening Group of the Spanish Society of Epidemiology, have written this consensus document, which is included in chapter 10 of the "Clinical Practice Guideline for Diagnosis and Prevention of Colorectal Cancer.

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Background: Type I gastric neuroendocrine tumors (gNETs) classically arise because of hypergastrinemia and involve destruction of parietal cells, which are responsible for gastric acid secretion through the ATP4A proton pump and for intrinsic factor production.

Methods: By whole exome sequencing, we studied a family with three members with gNETs plus hypothyroidism and rheumatoid arthritis to uncover their genetic origin.

Results: A heterozygous missense mutation in the ATP4A gene was identified.

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Background & Aims: We investigated whether patients with multiple serrated polyps, but not meeting the World Health Organization criteria for serrated polyposis syndrome, and their relatives have similar risks for colorectal cancer (CRC) as those diagnosed with serrated polyposis.

Methods: We collected data from patients with more than 10 colonic polyps, recruited in 2008-2009 from 24 hospitals in Spain for a study of causes of multiple colonic polyps. We analyzed data from 53 patients who met the criteria for serrated polyposis and 145 patients who did not meet these criteria, but who had more than 10 polyps throughout the colon, of which more than 50% were serrated.

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Background And Study Aims: Endoscopic surveillance in patients with multiple colorectal polyps aims to reduce colorectal cancer (CRC) incidence and mortality, as well as the need for colorectal surgery. The aim of this study was to determine the risk of developing CRC or the need for surgery during endoscopic surveillance in a cohort of patients with multiple (10 - 100) colorectal polyps.

Patients And Methods: This was a multicentrer, longitudinal, observational study in 15 CRC high risk clinics in Spain, carried out between January 2009 and December 2010.

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Purpose: The present study aimed to determine the prevalence of MUTYH mutations in patients with multiple colonic polyps and to explore the best strategy for diagnosing MUTYH-associated polyposis (MAP) in these patients.

Experimental Design: This study included 405 patients with at least 10 colonic polyps each. All cases were genetically tested for the three most frequent MUTYH mutations.

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Aim: To evaluate the long-term natural history of the gastroduodenal lesions secondary to extrahepatic embolization with Ytrium 90 (⁹⁰Y) spheres.

Methods: From September 2003 to January 2012, 379 procedures of liver radioembolization (RE) using resin microspheres loaded with ⁹⁰Y were performed in our center. We have retrospectively compiled the data from 379 RE procedures performed in our center.

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Background & Aims: We investigated clinical and molecular differences between the different phenotypes of serrated polyposis syndrome (SPS) and the frequency of mutations in BRAF or KRAS in polyps from patients with SPS.

Methods: We collected data on clinical and demographic characteristics of 50 patients who fulfilled the criteria for SPS. Polymerase chain reaction and sequence analysis were used to identify BRAF and KRAS mutations in 432 polyps collected from 37 patients; we analyzed CpG island methylator phenotypes in 272 of these polyps.

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Colonoscopy is an essential diagnostic and therapeutic tool for many gastrointestinal diseases and is also a key element in the prevention and early diagnosis of colon cancer. Despite numerous technical advances, colonoscopy continues to be uncomfortable for patients, both during and after the procedure. To a large extent, the discomfort of colonoscopy depends on the need to distend the colon, which usually produces abdominal pain.

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The main goal at a High-Risk Gastrointestinal Cancer Clinic is to identify individuals at increased risk of developing tumors for diagnosis them in presymptomatic stages, when they are potentially curable. We report an asymptomatic patient belonging to a family with hereditary diffuse gastric cancer syndrome with a novel pathogenic mutation in the E-cadherin gene. In the absence of any proven diagnostic tool in surveillance tumor of this syndrome, the recommendation accepted today for an asymptomatic individual with known mutation is to perform prophylactic surgery.

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Background And Objectives: Familial adenomatous polyposis is an inherited disorder characterized by the presence of multiple colorectal adenomas (more than 100 in the classic form and between 10 and 100 in the attenuated one), with a high risk of colorectal cancer development. To improve the diagnostic and therapeutic management of these patients, the Spanish Registry of Familial Adenomatous Polyposis was created in 2007.We aimed to evaluate the clinicopathological characteristics of patients with familial adenomatous polyposis in Spain.

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Background & Aims: Thyroid carcinoma is an extraintestinal manifestation of familial adenomatous polyposis (FAP) syndrome, but the precise risk is unknown. The optimal approach for thyroid cancer screening has not been established. We sought to define the prevalence of thyroid cancer and the role of screening ultrasound in FAP patients.

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Purpose: To evaluate the feasibility and safety of intratumoral injection of autologous dendritic cells (DCs) transfected with an adenovirus encoding interleukin-12 genes (AFIL-12) for patients with metastatic gastrointestinal carcinomas. Secondarily, we have evaluated biologic effects and antitumoral activity.

Patients And Methods: Seventeen patients with metastatic pancreatic (n = 3), colorectal (n = 5), or primary liver (n = 9) malignancies entered the study.

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