Exploring Gut Microbiome Composition and Circulating Microbial DNA Fragments in Patients with Stage II/III Colorectal Cancer: A Comprehensive Analysis.

BACKGROUND: Colorectal cancer (CRC) significantly contributes to cancer-related mortality, necessitating the exploration of prognostic factors beyond TNM staging. This study investigates the composition of the gut microbiome and microbial DNA fragments in stage II/III CRC. METHODS: A cohort of 142 patients with stage II/III CRC and 91 healthy controls underwent comprehensive microbiome analysis. Fecal samples were collected for 16S rRNA sequencing, and blood samples were tested for the presence of microbial DNA fragments. De novo clustering analysis categorized individuals based on their microbial profiles. Alpha and beta diversity metrics were calculated, and taxonomic profiling was conducted. RESULTS: Patients with CRC exhibited distinct microbial composition compared to controls. Beta diversity analysis confirmed CRC-specific microbial profiles. Taxonomic profiling revealed unique taxonomies in the patient cohort. De novo clustering separated individuals into distinct groups, with specific microbial DNA fragment detection associated with certain patient clusters. CONCLUSIONS: The gut microbiota can differentiate patients with CRC from healthy individuals. Detecting microbial DNA fragments in the bloodstream may be linked to CRC prognosis. These findings suggest that the gut microbiome could serve as a prognostic factor in stage II/III CRC. Identifying specific microbial markers associated with CRC prognosis has potential clinical implications, including personalized treatment strategies and reduced healthcare costs. Further research is needed to validate these findings and uncover underlying mechanisms.

Role of telomere length in human carcinogenesis (Review).

Cancer is considered the most important clinical, social and economic issue regarding cause­specific disability­adjusted life years among all human pathologies. Exogenous, endogenous and individual factors, including genetic predisposition, participate in cancer triggering. Telomeres are specific DNA structures positioned at the end of chromosomes and consist of repetitive nucleotide sequences, which, together with shelterin proteins, facilitate the maintenance of chromosome stability, while protecting them from genomic erosion. Even though the connection between telomere status and carcinogenesis has been identified, the absence of a universal or even a cancer­specific trend renders consent even more complex. It is indicative that both short and long telomere lengths have been associated with a high risk of cancer incidence. When evaluating risk associations between cancer and telomere length, a disparity appears to emerge. Even though shorter telomeres have been adopted as a marker of poorer health status and an older biological age, longer telomeres due to increased cell growth potential are associated with the acquirement of cancer­initiating somatic mutations. Therefore, the present review aimed to comprehensively present the multifaceted pattern of telomere length and cancer incidence association.

The impact of laparoscopic Nissen fundoplication on the long-term quality of life in patients with gastroesophageal reflux disease.

Laparoscopic Nissen fundoplication is now the most common surgical procedure for treatment of gastroesophageal reflux disease (GERD), offering promising long-term outcomes. Outcomes for 46 patients with GERD who underwent Nissen fundoplication during the last 5 years (November 2007-June 2012) were prospectively studied using a structured questionnaire that evaluated clinical symptom scores for heartburn, dysphagia, and satisfaction with clinical outcomes. Postoperative care of the patients including analgesia, median hospital stay, overall cost, and complications was also studied. Clinical follow-up data for 2 years after surgery were available for all 46 patients. Forty-two patients (91.3%) were satisfied with their quality of life and only eight patients (17.4%) continued to receive antacids after surgery. Dysphagia to solid and liquid occasionally appeared in 26.1% (N = 12) and 17.4% (N = 8) of patients, respectively. Laparoscopic Nissen fundoplication was an effective long-term treatment for GERD. The operation resulted in a significant reduction of symptoms and minimized the use of antacid drugs with a high degree of patient satisfaction. Although some patients may have returned to antacid treatment at late follow-up or continued to complain of mild discomfort, they were overall pleased with the outcome.