How would you treat a patient with biopsy-proven recurrent urothelial bladder cancer with M1a disease (limited to retroperitoneal nodal disease)?

Systemic therapy with either clinical trial, or chemotherapy (ideally cisplatin-based or carboplatin/gemcitabine if cisplatin-unfit), or immune checkpoint inhibitor (if it is first line treatment setting and cisplatin-unfit, options include either pembrolizumab or atezolizumab, if either 'PD-L1 high...