Dad diagnosed with non Hodgkin’s lymphoma. What is the chance of curability and how long can someone live with this

So after discovering a lump in his neck my dad got his biopsy done and last week was diagnosed with B cell non Hodgkin’s lymphoma stage 1. They said it was in the very early stages. My dad has been on immunosuppressants for 15 years of his life following a kidney transplant which caused the cancer. What should I expect and with this diagnosis are the chances high or low. Thanks in advance