Hi Andreag555,
Sorry to hear about your father RT diagnosis. Quick background on myself. Dx'd with CLL in 2014. Various lines of treatment. Heavely treated with about 6 treatments one after the other(Sorry chemo brain keeps me from remembering all of them!) Was on Venetolclax in 2018. Diagnosed with RT in 2018.(DLBCL). Started RICE, followed by R-CHOP and then R-EPOCH (I hope the order is correct). They were all tough regimes. As far as I remember even upto the last treatment, there was not good progress and my wonderful consultant was looking for other avenues.
Then 2 or 3 months down the line without any treatment, the DLBCL disappeared. I did ask my doctor, what the hell just happened! He said looks like the treatment/s may have had a delayed reaction and kicked in( my words, not his). So far in remission with DLBCL, and back on Ibrutinib to deal with the CLL which was still in the background, and hope to move forward with SCT. I hope this helps a little. Please feel to reach out if I can try and answer any questions you have. Best of luck to your father.