Per your comments, "There are very limited ways for patents to get extended. They do not include just filing new patents with extra features."
In the case of NWBO, the majority of their patents are in the medical based sector where as the USPTO and other patent granting facilities all over the world grant patent extensions for medical based sectors.
The bottom line, good news for NWBO and their patents with respect to the patent office, and the patent office understands that extensions are necessary, and one of the main reasons is in light of the ongoing obstacles facing NWBO and other companies in this patent sector, IMPO.