The best replacement for remission is cancer free.

The best alternatives to remission are rated as following:
★★★★★  cancer free
★★★★  cure
★★★  mitigation
★★★  ned
★★★  forgiveness
★★  relapse
★★  response
★★  recovery
★★  condonation
★  waiver
★  quiessence
★  remittance
★  atonement
★  exacerbation
  regression
  early partial remission
  partial remission
  cured
  complete response

Your alternative for remission is not listed? Suggest!
Speaking about remission, one probably shouldn't forget about multiple myeloma.

Other search terms related to remission and their ratings are:
★★★★★ multiple myeloma
★★★★ leukemia
★★★ aml
★★ shedding blood
cll
You have in mind a companion for remission and it is not yet here? Propose!



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remission
cancer free
cure