Constructive vs. destructive radonc clinical trials

How come Australians (Eg: Shankar Siva), Canadians (David Palma) and the English are doing some of the constructive/ expanding scope of trials and the we almost always to self destructive clinical trials? May be except for the Cardiac SBRT.
Source: Student Doctor Network - Category: Universities & Medical Training Authors: Tags: Radiation Oncology Source Type: forums