Man stabbed in Sydney house party brawl

A teenager has been stabbed after a pack of up to 50 people gatecrashed a party in Sydney's west.

The 19-year-old suffered wounds to his shoulder and chest after a brawl erupted at the Hassall Grove party late on Saturday night.

The man remains at Nepean Hospital in a stable condition.

He isn't co-operating with police and no arrests have been made.