What is the primary outcome of apoptosis induced by radiation exposure in a tumor?

The primary outcome of apoptosis induced by radiation exposure in a tumor is a reduction in the number of viable cancer cells. When tumors are exposed to radiation, the radiation damages the DNA within the cancer cells, leading to programmed cell death, or apoptosis. This process is crucial in cancer treatment, as it helps to eliminate malignant cells and reduce the overall tumor burden.

Through apoptosis, the cells that are heavily damaged or no longer viable are removed from the population, which ultimately contributes to a decrease in tumor size and progression. The effectiveness of radiation therapy relies on its ability to induce this apoptotic response in tumor cells, thereby enhancing the therapeutic outcome. By reducing the number of viable cancer cells, radiation therapy aims to control or eliminate the cancer, making it a key strategy in oncology.