Characterizing inflammation and fibrosis in Crohn's disease (CD) is necessary to guide clinical management, but distinguishing the two remains challenging. Novel ultrasound (US) techniques: contrast-enhanced US (CEUS) and shear wave elastography (SWE) offer great potential in evaluating disease activity in pediatric patients. Three patients ages 16 to 20 with known CD underwent CEUS and SWE to characterize bowel wall inflammation and fibrosis. Magnetic resonance enterography, endoscopy, or surgical pathology findings are also described when available. The patients' disease activity included acute inflammation, chronic inflammation with stricture formation, and a fibrotic surgical anastomosis without inflammation. CEUS was useful in determining the degree of inflammation, and SWE identified bowel wall fibrosis. Used together these techniques allow for better characterization of the degree of fibrosis and inflammation in bowel strictures. With further validation CEUS and SWE may allow for improved characterization of bowel strictures and disease flares in pediatric patients suffering from CD.
Adolescent ; Anastomosis, Surgical ; Constriction, Pathologic ; Contrast Media ; Crohn Disease ; Elasticity Imaging Techniques ; Endoscopy ; Fibrosis ; Humans ; Inflammation ; Inflammatory Bowel Diseases ; Pathology, Surgical ; Pediatrics ; Ultrasonography

Introduction: The 'first generation' physician gathers a lot of strength to venture into a world unknown to him. Unlike a physician born to a family of physicians who has a family to guide him, the 'first generation' physician only has himself to survive this endeavor. Through the life worlds of a select group of 'first generation' physician-in-training, this study seeks to answer the following central question: How do 'first generation' Filipino physicians collectively characterize their liminal spaces in transition from medical school to clinical practice?

Methodology: Anchored on the Theory of the Rites of Passage, this phenomenological inquiry, intends to surface the lebenswelt or essence of the experience of being the only physician in the family. Respondents comprised a purposive sample of physicians-in-training (residents and fellows), who are the only physicians in the family. Data were gathered using semi-structured interviews. Triangulation and member checking procedures were done to ensure the data reliability. Data were then subjected to cool (categorization) and warm analysis (thematization) using the Colaizzi's method.

Findings and Discussion: With all the transcribed experiences summarized and those with the same meaning analyzed, the following categories and themes were generated: The Intending Facet / Purpose: From Uncertainty towards Redefinition; The Thinking Facet / Process: From Perplexity towards Self-efficacy; The Relating Facet / People: From Isolation towards Integration; and The Transforming Facet / Power: From Vulnerability towards Empowerment. It was shown that a 'first generation' physician in this liminal space undergoes challenges and struggles during his training in medicine. This served as his Rite of Passage to transition him to someone dreaming only to become a physician, to become redefined with conviction, supported and integrated into the health system, empowered and transformed to the physician he is meant to be.

Recommendations: Physicians undergo a lot of challenges and mental stress and it means a lot for trainers to enter into the trainees' life-world, especially that of a 'first generation' physician, so that they can build socio-emotional learning and mentoring programs and counselling services that address different facets of liminal space that the trainees go through.

Identification of the precise molecular pathways involved in oncogene-induced transformation may help us gain a better understanding of tumor initiation and promotion. Here, we demonstrate that SOX2 foregut epithelial cells are prone to oncogenic transformation upon mutagenic insults, such as Kras and p53 deletion. GFP-based lineage-tracing experiments indicate that SOX2 cells are the cells-of-origin of esophagus and stomach hyperplasia. Our observations indicate distinct roles for oncogenic KRAS mutation and P53 deletion. p53 homozygous deletion is required for the acquisition of an invasive potential, and Kras expression, but not p53 deletion, suffices for tumor formation. Global gene expression analysis reveals secreting factors upregulated in the hyperplasia induced by oncogenic KRAS and highlights a crucial role for the CXCR2 pathway in driving hyperplasia. Collectively, the array of genetic models presented here demonstrate that stratified epithelial cells are susceptible to oncogenic insults, which may lead to a better understanding of tumor initiation and aid in the design of new cancer therapeutics.