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Approximately 90% of cancerous brain tumors are “metastatic” tumors that have spread (“metastasized”) to the brain through the blood stream from an advanced cancer in an extracranial organ (e.g. lung, breast, prostate, liver, testicle, ovary, etc.).
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“Mets” consist of tissue from the originating extracranial tumor.
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Once the extracranial cancer has reached the metastatic stage, there is a continuing source of new tumors in the brain. Therefore, metastatic tumors often appear in multiple sites and new tumors may continue to occur as long as the originating organ disease remains active. Continuing recurrence complicates treatment.
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Brain Cancer
