My big Long Island Cheese pumpkin stem broke, but not all the way off. It was growing half way up on my fence and, as the weight increased, it sunk lower. (I should have given it a support, but forgot.) Finally, the weight pulled the pumpkin all the way to the ground, but the vine couldn't stretch quite that far. It has partially broken. I don't dare touch it. It seems to me there may be enough intact stem for it to ripen. I'm keeping my fingers crossed.
Its a nice big pumpkin and very early in the season. Even if it doesn't make it, there is still plenty of time for others to set and ripen.