Biologics and radiotherapy

I am hoping for some information regarding use of the psoriasis biologic Cosentyx when receiving radiotherapy for lung tumour. I have used monthly Cosentyx injections for 4 years which cleared my psoriasis completely. Then January 2023 a small cluster of lung nodules were seen on a chest CTscan . By July they had grown and lit up on a PET scan. A biopsy or surgery was not possible owing to proximity to the heart and other factors ( I am 77 yrs old and not fit) but after advice from oncologists at the Royal Marsden and Nottingham I have begun 20 sessions of daily radiotherapy since they seem agreed that this is an early contained lung cancer. However, my dermatologist stopped my Cosentyx in July since using a biologic immuno suppressant while treating a possible cancer could cause problems. But my psoriasis is back with a vengeance , plaques appearing all over me. I am desperate to get back on my biologic once radiotherapy is complete . Does anyone have any experience of this please?