metastatic disease

Metastatic disease occurs when cancer cells spread from the original tumor to other parts of the body through the bloodstream or lymphatic system. These cells form new tumors called metastases, which can develop in organs like the lungs, liver, bones, or brain. The spread indicates that the cancer is more advanced, often requiring different treatments compared to the original tumor. Understanding metastasis helps in planning effective therapy and estimating prognosis, as it reflects the cancer’s ability to invade beyond its initial site and establish new growths elsewhere.