Here is the most detailed info I have seen to date about the drug trial GC376 and the 20 cats that participated. This was published in the Journal of Feline Medicine and Surgery. This chart shows all 20 cats that participated and identifies the 7 cats remaining in remission. The link below the chart contains much more information.
Efficacy of a 3C-like protease inhibitor in treating various forms of acquired feline infectious peritonitis
Niels C Pedersen, Yunjeong Kim, Hongwei Liu, Anushka C Galasiti Kankanamalage, Chrissy Eckstrand, William C Groutas, Michael Bannasch, Juliana M Meadows and Kyeong-Ok Chang