Why might the growth of cancer tumors in an organ have fatal results?

The growth of cancer tumors in an organ can lead to fatal results primarily because they disrupt normal organ function, impairing vital processes such as respiration, digestion, or circulation. As tumors expand, they can invade surrounding tissues, causing damage and potentially leading to organ failure. Additionally, cancer cells can metastasize, spreading to other parts of the body and creating secondary tumors, which further complicate treatment and reduce the chances of recovery. Ultimately, the cumulative effects of these factors can lead to life-threatening conditions.