Er negative grade 3

Hi all

i I got diagnosed last Friday ER negative and only just had CT scsn

they say it’s grade 3!

hownever I’m left up in the air , every one says ER negative with other sub types , so when I look if there are  targeted treatments to go with mine it only says with other subtypes 

also do I have to ask for targeted treatments or are they offered  xx

many thanks