What is metastasis in relation to cancer?

Metastasis in relation to cancer refers to the process by which cancer cells spread from their original site to other parts of the body. This occurs when cancer cells invade surrounding tissues, enter the bloodstream or lymphatic system, and establish new tumors in distant organs. Metastasis signifies a more advanced stage of cancer and can complicate treatment options, as it indicates that cancer has the potential to affect multiple body systems simultaneously. Understanding this process is crucial for determining the prognosis and management of cancer patients, as metastatic cancer often requires more aggressive treatment strategies compared to localized cancer. The correct answer highlights the critical nature of metastasis in cancer pathology and patient care.