1.- MicroRNAs in Cancer (An Overview).- 2. The Role of MicroRNAs in Lung Cancer Development, Progression, and Metastasis.- 3. MicroRNAs in Breast Cancer.- 4. MicroRNAs in Colorectal Cancer.- 5. MicroRNAs in Gastric Cancer.- 6. MicroRNAs in Prostate Cancer: A Possible Role as Novel Biomarkers and Therapeutic Targets?- 7. MicroRNAs in Hepatocellular Carcinoma.- 8. MicroRNAs in Cervical Carcinoma.- 9. MicroRNAs in Esophageal Cancer.- 10. MicroRNAs in Bladder Cancer.- 11. MicroRNAs in Lymphoma.- 12. MicroRNAs in Leukemia.- 13. MicroRNAs in Pancreatic Cancer: Potential Interests as Biomarkers and Therapeutic Tools.- 14. MicroRNAs in Epithelial Ovarian Cancer.- 15. MicroRNAs in Brain Tumors.- 16. MicroRNAs and Cancer Stem Cells.- 17. MicroRNAs in Cancer Invasion and Metastasis.- 18. MicroRNAs in Predicting Radiotherapy and Chemotherapy Response.- 19. Role of MicroRNAs in Anti-cancer Drug Resistance.- 20. MicroRNAs and Cancer Metabolism.- 21. MicroRNAs as Blood-based Biomarkers of Cancer.- 22. RNAi-based Approaches to the Treatment of Brain Tumors.