[Bone histomorphometry in monoclonal dysglobinemia. Diagnostic and prognostic value]

Area of Science:

• Oncology
• Hematology
• Bone Biology

Background:

• Multiple myeloma (MM) is a hematologic malignancy characterized by uncontrolled plasma cell proliferation.
• Bone disease is a common and serious complication of MM, impacting patient quality of life and survival.
• Understanding the mechanisms of bone destruction in MM is crucial for diagnosis and treatment.

Purpose of the Study:

• To investigate differences in bone histomorphometry between multiple myeloma and benign monoclonal gammopathy.
• To evaluate the diagnostic and prognostic value of osteoclastic resorption in multiple myeloma.
• To explore the relationship between bone resorption markers and established prognostic factors in MM.

Main Methods:

• Transiliac bone biopsy analysis in 35 multiple myeloma patients and 26 with benign monoclonal dysglobulinemia.
• Histomorphometric assessment of bone resorption parameters.
• Correlation analysis with clinical data and prognostic factors.

Main Results:

• Osteoclastic resorption was significantly higher in multiple myeloma patients (both osteolytic and asymptomatic forms) compared to controls.
• Preservation of bone trabecular volume with high osteoclastic resorption was unique to myeloma patients.
• Intense osteoclastic resorption (STRO ≥ 6) was associated with a poor prognosis, including increased risk of osteolysis and hypercalcemia.
• Bone resorption markers correlated with calcemia and beta-2 serum microglobulin levels.

Conclusions:

• Osteoclastic resorption is a valuable diagnostic marker in multiple myeloma.
• Elevated osteoclastic activity is a significant negative prognostic indicator in MM.
• Targeting osteoclasts may be a beneficial therapeutic strategy in conjunction with chemotherapy for MM.