Paraneoplastic hypercalcemia in ovarian tumors

Area of Science:

• Endocrinology
• Oncology
• Nephrology

Background:

• Paraneoplastic hypercalcemia is a rare complication associated with various malignancies.
• Ovarian tumors, particularly mesonephromas, are disproportionately represented in cases of paraneoplastic hypercalcemia.

Observation:

• Two cases of paraneoplastic hypercalcemia secondary to ovarian tumors are presented.
• Both cases involved ectopic parathormone (PTH) production as the underlying mechanism.

Findings:

• Ectopic PTH production is a key mediator of hypercalcemia in these ovarian tumor cases.
• Other potential mediators include prostaglandins, vitamin D-like sterols, and osteoclast-activating factor.
• Mesonephromas are frequently associated with this paraneoplastic syndrome.

Implications:

• Acute hypercalcemia management involves hydration, diuresis with furosemide, and potentially phosphates or steroids.
• Calcitonin provides short-term relief, while mithramycin is effective for long-term palliation if tumor therapy fails.
• Understanding the association with mesonephromas aids in diagnosis and management of paraneoplastic hypercalcemia.