Chapter 1: Interactions in cancer ecosystem -- Chapter 2: Local niche construction -- Chapter 3: Pre-metastatic niche -- Chapter 4: Emerging concepts in cluster metastasis -- Chapter 5: Neuronal regulation in cancer ecosystem -- Chapter 6: Endocrinal regulation in cancer ecosystem -- Chapter 7: Innate immune system in cancer ecosystem -- Chapter 8: Adaptive immune system in cancer ecosystem -- Chapter 9: Inflammation in cancer ecosystem -- Chapter 10: Metabolic regulation in cancer ecosystem -- Chapter 11: Vascular regulation in cancer ecosystem -- Chapter 12: Microbial interaction in cancer ecosystem -- Chapter 13: Viral interaction in cancer ecosystem -- Chapter 14: Evolution of cancer ecosystem -- Chapter 15: Driving force of cancer ecosystem -- Chapter 16: Modeling, visualizing and subtyping the cancer ecosystem -- Chapter 17: Bio-engineering methods to mimic cancer ecosystem -- Chapter 18: Cancer ecosystem-directed therapeutic strategies.