It looks like you’re sharing (or asking to refine) a headline-style sentence. Here are clearer, more natural rewrites, depending on the tone you want:
Neutral / news-style
- Pancreatic cancer: The two symptoms that should have been warning signs before my dad died within 12 weeks
More empathetic / personal
- Pancreatic cancer: The two symptoms we wish we’d recognised before my dad died within 12 weeks
Stronger awareness-focused
- Pancreatic cancer: These two early symptoms were missed before my dad died within 12 weeks
More concise
- Pancreatic cancer: Two warning signs my dad had before dying within 12 weeks
If you want, I can also:
- make it less sensational and more medical,
- adapt it for SEO or a news site,
- or help rewrite the full article or post in a sensitive, clear way.
Just tell me the context you’re writing for.