Rabbit MMS/CDS

Hello, i have a rabbit with a tumor on his belly. So for week and something i gave him CDS/MMS and use on it protocol 3000. First day when i do protocol 3000 it worked great and tumor begin to shrink from 7-8 sm to 1-2 in diameter. But for a week it doesn't have changed, so i don't know what to do. I gave him CDS with his banana treat because this is the only way possible to give him. Please i need advise. Thank you