Brain metastases from unknown primary tumour: a prospective study

Area of Science:

• Neuro-oncology
• Oncology
• Neurosurgery

Background:

• Management of brain metastases from unknown primary tumors lacks clear guidelines due to limited data.
• Retrospective studies are the primary source of information for this challenging clinical scenario.

Purpose of the Study:

• To evaluate the efficacy of surgery and/or radiotherapy in patients with brain metastases from an initially undetected primary tumor.
• To identify prognostic factors influencing survival in this patient population.

Main Methods:

• Retrospective analysis of 33 patients with biopsy-proven brain metastases from an unknown primary tumor.
• Treatment modalities included surgery and/or whole-brain radiotherapy (WBRT).
• Patients were followed with serial CT scans until death.

Main Results:

• Median survival was 10 months; 2-year survival was 15%.
• Single brain metastasis treated with gross total resection and WBRT had a median survival of 13 months.
• Multiple brain metastases had a poorer prognosis, with median survival of 6-8 months.
• Neurological improvement was observed in 85% of single metastasis patients post-surgery.
• The primary tumor was identified in 82% of patients, most commonly lung cancer.
• Number of brain metastases was the sole significant prognostic factor.

Conclusions:

• Surgery and/or WBRT can effectively control brain disease in patients with metastases from an unknown primary.
• The number of brain metastases is a critical factor determining patient survival.
• Systemic disease may remain clinically silent for extended periods, influencing treatment strategies.