Basic and clinical associations between bone and cancer.

Bone is one of the most common distant organs in which tumor cells tend to metastasize depending on complicated immune system and bone microenvironments. Clinical symptoms such as severe pain and bone fractures associated with bone metastases severely affect patients' quality of life. According to the pathological types of bone destruction caused by the biological characteristics of different primary cancer cells, bone metastases are classified as osteolytic, osteoblastic and mixed types. Herein, we discuss the molecular mechanisms of bone metastasis and the therapeutic strategy with focus on bone metabolism.