Conversation so far:
when did Eric Carr become ill?
Eric Carr began feeling ill in February 1991, .
what was Eric Carr diagnosed with?
Eric Carr's medical tests initially revealed what appeared to be manageable health issues.
what was Eric Carr prognosis?
Eric Carr's further tests determined that he had heart cancer
What did Eric Carr's band mates think of his diagnosis?
Stanley and Simmons have stated they repeatedly told Eric Carr to focus on his cancer treatments and they would allow him to return to Kiss once he regained his health.

Question: what was the treatment he was given?
Self-contained rewrite: what was the treatment Eric Carr was given?