Conversation so far:
When did Chrisye get sick?
July 2005.
What was his ailments?
complaining of breathing difficulties.
What else was wrong?
he was diagnosed with lung cancer.
Was it treatable?
he underwent the first of six rounds of chemotherapy on.

Question: Where did he do that?
Self-contained rewrite: Where did Chrisye undergo the first of six rounds of chemotherapy for lung cancer?