1. Introduction 2. Overview of Gastrointestinal Diseases 2.1 Definition and Classification 2.2 Current Diagnostic Methods 2.3 Importance of Early Detection 3. Non-Invasive Diagnostic Techniques 3.1 Imaging Technologies 3.2 Biomarker Identification 3.3 Breath Tests 4. Novel Imaging Technologies 4.1 Advanced Endoscopic Procedures 4.2 Magnetic Resonance Imaging (MRI) 4.3 Optical Coherence Tomography 5. Biomarkers in Detection 5.1 Genetic Markers 5.2 Proteomic Profiles 5.3 Metabolomic Signatures 6. Breath Analysis Methodologies 6.1 Volatile Organic Compounds (VOCs) 6.2 Gas Chromatography-Mass Spectrometry 6.3 Electronic Nose Technology 7. Evaluation of Diagnostic Accuracy 7.1 Sensitivity and Specificity 7.2 Comparative Studies 7.3 Statistical Analysis 8. Challenges and Future Perspectives 8.1 Technological Limitations 8.2 Ethical and Clinical Considerations 8.3 Integration into Clinical Practice
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