I'm editing a church prayer sheet, and one of the requests is that someone's specific eye disorder won't keep getting worse. The original phrasing, unfortunately, was pretty awful: "Pray for Macular Degeneration to be maintained from further degeneration". I couldn't let that stand, and came up with "No further progression of macular degeneration" (with "pray for" implied, of course), but I'm not real happy with that either; it's too sesquipedalianly loquacious, and still a bit long too. I would say something about stasis, but that doesn't sound right for diseases.
The ideal here would be a nice short phrase/word, much like cancer's "remission", that applies to health problems that aren't generally recovered from but might not deteriorate further.