PARP9 and central nervous system cancer: The NMRGS score of every glioma patient was obtained as follows: NMRGS score = (-0.28992*CD38 expression) + (0.38315*NADK expression) + (-0.04654*NAPRT expression) + (0.2211*NMNAT3 expression) + (-0.24486*PARP6 expression) + (0.29991*PARP9 expression).