A list of the losses of JG 52 is available on the Net:
http://www.denkmalprojekt.org/Verlus..._vl_chrono.htm
For 1943, JG 52 lost:
55 KIA
9 KIFA
4 POW
52 MIA
so at least 120 lost pilots
But they were also
1 interned in Turkey
2 "MIA" who returned later to the unit
49 WIA
3 WIFA
At least some of them were also probably "lost", at least never flew again.