'become lost to' is a correct and usable phrase in written English.
You can use it to describe a situation where something has gone away, disappeared, or was taken away, leaving someone in a state of confusion. For example, "After his wife died, Jack felt as though his joy had become lost to him."
There are a number of ways in which data could be missing: the subject is unable to provide it, or they withdraw, or become lost to follow-up.
When middle-class households move away from a migrant neighborhood, do they cut all ties with the old neighborhood and do their social, cultural and economic resources really become lost to it?
If we withdraw from reality's true nature - that it changes constantly and so do we - we become lost to ourselves, punished by our troubles and by their ineffective cure.
Reading and writing become lost to me.
Once a patient is observed to have died he can no longer become lost to follow-up.
NPC patients may have died or become lost to follow-up.
Left to languish, the ballroom became lost to time, gathering a thick layer of dust and becoming a sort of grand attic for the hotel.
True, there was a welter of emotion to be countenanced, but I was happy to be doing it and became lost to the outside world.
Even the things that are sent to help us end up being caught in such a webby mass of unsought influences, unsuspected ramifications and counterintuitive consequences that the original benign impulse behind their invention becomes lost to history.
Don't hoard what seems good for a later place in the book, or for another book; give it, give it all, give it now... Anything you do not give freely and abundantly becomes lost to you".
The contours of the objective world fade more and more and so it goes, step by step, until finally the world -- everything we loved and by which we have lived -- becomes lost to sight.
