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Not only for lung cancers but squamous cell carcinomas affecting any part of the body can erode in to neighbouring structures like blood vessels,cavities, viscera etc.
Squamous cell cancers have a tendency to invade locally and cause destruction of any tissue that lies adjacent to them. Invasion and erosion is how they spread.
In your fathers case, since the tumor was in the lung, it was naturally surrounded by a rich vascular supply and airway tracts.
So, erosion in to a blood vessel, caused the blood vessel to bleed and that blood then filled the airway.
I am really sorry for your loss.
Let me know if you have any queries about this. Please enter the chat and reply to interact.
did he drown in the blood or was it the huge loss of blood that killed him? could I have done anything to help? and shouldn't someone have told us that was a possibility
what sort of symptons could there have been