e13676 Background: Gender-diverse individuals identify their gender as different to the sex they were assigned at birth. This population experiences health inequity throughout the cancer care pathway partly stemming from limited access to specialist knowledge of gender-affirming care and its intersections with cancer. Notable issues include safety of gender affirming hormones, mutual implications of gender affirming surgeries with cancer surgeries and radiotherapy, and psychological support when dysphoria is exacerbated by a cancer diagnosis. Methods: In response, we established the UK Cancer and Transition Service (UCATS), a national virtual monthly multidisciplinary meeting (MDM) and clinic. Patients are eligible for referral if they identify as gender-diverse and have active or historical malignancy. The service was coproduced with patient and public involvement, including input from a specialist cancer charity for gender and sexual minority people. The service launched in June 2022 and began advertising and requesting patient feedback from January 2023. Results: Between June 2023 and January 2024 UCATS received 20 referrals (10 from gender services, 5 from oncology, and 5 self-referrals). Patients were aged 18 - 68 years. The most common tumour types were breast (n = 6), prostate (n = 5), and gastrointestinal (n = 3). Others were haematological, testicular, gynaecological, and central nervous system. One patient had a familial cancer syndrome, not active cancer. Patients were offered a virtual clinic appointment and MDM discussion. Reasons for referral included safety of gender affirming hormones and surgeries, and expedited gender consultations in view of prognosis, or need for cancer treatments that may affect gender-affirming care. Two patients did not attend, with one sending a nominated family member. Six patients had at least one external clinician dial in for the appointment. Seven patients received follow-up appointments. There were nine completed feedback forms, 4 after first appointment and 5 after follow-up. All patients rated both the communication at the appointment and the information given as 5/5. All patients rated their likelihood to recommend the service as 4 or 5/5. Other points of positive feedback were the detailed outcome letter, speed of appointment, and a sense of advocacy. Next steps include routine follow-up appointments (in response to feedback), wider advertising, increased frequency, and recruitment of nursing support. Conclusions: UCATS successfully caters to an unmet need, coordinating cancer and gender affirming care for gender diverse patients, and providing specialist knowledge and support for patients and care teams.