Conversation so far:
What year did Lilyan Tashman die?
1934.
Where did she die?
New York City.
Was she buried there?
The burial in Brooklyn's Washington Cemetery.
How did she die?
Tashman died of cancer.
What kind of cancer did she have?
abdominal cancer.

Question: When was she diagnosed?
Self-contained rewrite: When was Lilyan Tashman diagnosed with Cancer?