TPS1646 Background: Multidisciplinary supportive care interventions are key to preventing and managing adverse effects of cancer and its treatment for patients, reducing symptom and psychological burdens and enhancing quality of life (QoL). However, the optimal composition of these interventions for men with genitourinary (GU) cancers is poorly understood. The LIAM Mc Trial is an enhanced supportive care programme, funded by the Irish Cancer Society and designed with the input of patient representatives who highlighted the unmet needs of cancer survivors. An important aspect of the trial is to demonstrate how to improve the survivorship supports and services for underserved communities of men who experience disparities in cancer incidence, prognosis, outcome and QoL, and have not traditionally been the focus of such initiatives. Methods: Using an embedded mixed-method process evaluation this prospective trial aims to assess the feasibility and impact of a holistic 12-week survivorship programme amongst men with advanced GU cancers at an Irish Cancer Centre. The programme involves twice-weekly sessions with input from a dedicated physiotherapist, dietitian, and nurse specialist, along with education sessions from medical social worker and psycho-oncology specialists, and programme oversight provided by medical oncologists. Outcomes are measured at three timepoints; pre-intervention, immediately post-intervention and at 6 months post intervention, and will include EORTC QoL; muscle strength; body composition through bioelectrical impedance analysis and ultrasound; diet quality; cancer related symptom control; cancer related fatigue scores; feasibility outcomes, qualitative interviews and a process evaluation. Any man with a locally advanced or metastatic GU cancer who has recently completed a course of treatment or is stable on active anti-cancer treatment is eligible for the programme. Over the two-year study period the sample size target is 72 participants. The primary endpoint of the study is to evaluate the feasibility of introducing an enhanced supportive care programme as part of routine management for male cancer patients with metastatic disease. Acceptability, satisfaction with the programme and QoL changes are key secondary endpoints. Barriers to participation are also a key outcome under investigation. The study was activated in May 2023 with the first participants enrolled in June 2023. To date 17 men have enrolled with accrual completion anticipated in June 2025. Clinical trial information: NCT05946993 .