She decided to _ the tumor in her breasts.
The word is excise, and in BrE it's pronounced with the stress on the second syllable to distinguish it from tax (where it's a noun and stressed on the first syllable). The verb excise meaning tax is very rare, and the examples here would never be interpreted as "tax".
verb with object
Cut out surgically.
‘the precision with which surgeons can excise brain tumours’