[Secondary osteoporosis or secondary contributors to bone loss in fracture. Bone metabolism in hematological disorders].

Bone marrow provides a microenvironment responsible for hematopoiesis, in which osteoclasts and osteoblasts interact with each other to maintain bone remodeling. Multiple myeloma and a portion of lymphoid tumors have a unique propensity to expand in bone. Such tumors have been demonstrated to perturb bone metabolism and skew a microenvironment in bone suited for their growth and survival. However, a bone metabolic state remains largely unknown in most of hematological disorders without apparent bone disease, although hematopoiesis and bone metabolism appear to have a link. Also, the skeletal effects of treatment for hematological disorders should be clarified further.