Hello Dear
I evaluated your concern in depth .
Sorry to hear about issue of your son .
@ Clinically
Astrocytoma are notorious nervous system cancers .
@
Survival rate depends upon many factors as type of lesion , extent ,
progress , metastasis , host immune response , associated co morbid
conditions , type of treatment , grading , staging by WHO criteria & many
more
@ I will comment at this juncture that Lower grade I , II have lesser
mortality & higher survival rate as compared to
Grade III , IV with higher mortality & lesser survival rates .
Hope this helps you to some extent .
Feel free to ask any doubt in future anytime .
Wishing your son peaceful life ahead .
Thanks for using Health care magic .
Regards .