Cancer Metastasis

Cancer metastasis is the biological process in which malignant cells break away from a primary tumor, travel through the bloodstream or lymphatic system, and establish new growths in distant organs. This spreading ability distinguishes cancers that can be surgically removed from those that become systemic, making it a central concern for clinicians who must decide on treatment intensity and predict patient outcomes. Metastasis appears wherever solid tumors arise—whether in breast, lung, prostate or colon tissue—and underlies the majority of cancer‑related deaths because the secondary sites often disrupt vital organ function and are harder to treat with localized therapies.