2.5 End points and their definition
The first end points included LC. LC was defined as the interval from
the date of RSI-BT to the date of local progression. The second end
points included OS and treatment-related toxicity. OS was defined as
interval from the date of RSI-BT to the date of death for any cause.
Treatment-related toxicity was evaluated by the Radiation Therapy
Oncology Group (RTOG) classification criteria28.