Refers to the relative susceptibility of cells, tissues, tumors and organs to radiation.
Tumors that respond to radiation with regression considered radiosensitive..
Tumor response reflected in rate and degree of regression of disease not a reliable predictor of radiation dose required for cure of lesion.
Indicates the likelihood of local tumor control.
Proliferation rate of tumors does not predict for radiosensitivity.
Cells in mitosis more sensitive to radiation tan cells in other phases of the cell cycle.