We are delighted to introduce you to the first of four online sessions on OncoDiagnostics, focusing on gynaecological, breast, GI and GU cancers. These sessions will provide an overview of key pathology and imaging aspects, designed specifically for young oncologists eager to enhance their knowledge and develop practical skills. The online sessions are a lead-up to the 2nd edition of the Kyiv Seminars in OncoDiagnostics, which we are planning to hold from 15–17 April 2027 in Chisinau, Moldova. Participants will build a strong foundation through the online sessions, followed by in-depth presentations, interactive discussions and real-world case studies during the in-person event. This combination will help consolidate key concepts and provide opportunities to apply knowledge in a collaborative learning environment.