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Background: To understand the impact of the COVID-19 pandemic on National Health Services (NHS) cancer service delivery, care and patients, we examined the impact of changes in cancer service delivery, treatment intensity and delay by evaluating oncological outcomes of genitourinary (GU) cancer patients receiving systemic anticancer treatment (SACT) during 1st March and 8th July 2020. Methods: We used data from patients with GU cancers (i.e. prostate, urothelial, kidney and testicular) treated with SACT at Guy’s Cancer Centre during the first wave of the COVID-19 pandemic in the UK: demographics (sex, age, ethnicity, ECOG performance status (PS), comorbidities, smoking history, socio-economic status (SES)) and disease characteristics (stage, treatment type and setting, lines of treatment), as well as results from SARS-CoV-2 PCR testing. Classification of COVID-19 severity was based on the World Health Organisation (WHO) guidelines. Results: A total of 457 GU cancer patients received SACT during the study period: 68% prostate cancer, 23% renal cancer, 7% urothelial cancer, 2% testicular cancer. Mean age was 69 years (SD: 11.2). 91% were males, 82% were classified as low SES and out of the 291 patients we had ethnicity data on 199 (68%) were White British. The majority of patients had a PS of 1 and 95% of all patients had stage IV disease and hence received palliative SACT, with 58% being in the second line setting. Half of the patients received hormone therapy, 17% received chemotherapy, 20% received targeted therapy, 13% received immunotherapy (IO) and 1% received combination IO and targeted treatment. Only 5 (1%) patients tested SARS-CoV-2 positive: 2 had prostate cancer, 2 renal and 1 bladder cancer. Mean age was 66 years (SD: 5.6). They were all male, 2 White British, 1 Black African and 2 of unknown ethnicity and were all classified as low SES. Average PS was 2. Of these 5 patients 3 had at least two comorbidities (i.ehypertension, diabetes mellitus, renal impairment, frailty) and were receiving multiple medications. All had stage IV disease and received palliative SACT. 3 were on hormone therapy alone and 2 on chemotherapy. 2 of the patients presented symptoms within less than 7 days from PCR diagnosis, 1 within 7 to 14 days and 1 after 14 days. All 5 COVID-19 positive patients required hospitalization, 4 suffered severe pneumonia, 1 died from COVID-19 and 2 died from cancer related causes. In comparison, the mortality rate for the COVID-19 negative patients was 3.3%. Conclusion: Despite the impact of COVID-19 in health provision, a large number of our GU patients at Guy’s Cancer Centre safely received SACT. Our results suggest that the continuation of SACT during the COVID-19 pandemic did not increase the risk of COVID-19 in our patient cohort (SARS-CoV-2 infection rate: 1%). Of note, the infection rate was lower than observed in a similar study in our centre for gastrointestinal cancer patients (SARS-CoV-2 infection rate: 3.4%). In light of the above, decisions against SACT or SACT intensity should carefully be evaluated. Citation Format: Christina Karampera, Beth Russell, Charlotte Moss, Rushan Sylva, Kieran Palmer, Elias Pintus, Sarah Rudman, Debra Josephs, Kamarul Zaki, Mieke Van Hemelrijck, Saoirse Dolly, Deborah Enting. Real world data analysis of patients with genitourinary cancers receiving systemic anticancer treatment during the COVID-19 pandemic at Guy's Cancer Centre: A single centre retrospective study in the UK [abstract]. In: Proceedings of the AACR Virtual Meeting: COVID-19 and Cancer; 2021 Feb 3-5. Philadelphia (PA): AACR; Clin Cancer Res 2021;27(6_Suppl):Abstract nr S09-03.