[Network science. Part 2 : in radiotherapy].

In a former publication, we summarized basic principles of network science in order to understand its potential, especially within the field of oncology. This rather young science offers, for example, the opportunity to identify new systemic treatment options. However, these are not the only therapeutic options within the arsenal devoted to the battle against cancer. The two other main pillars of treatment are surgery and radiotherapy. It is our purpose to highlight some applications - rather limited nowadays - of network science in radiotherapy. Data are not so abundant compared to the field of systemic treatments.