Background: First-line treatment of patients with classical Hodgkin lymphoma (HL) with anti-PD1 antibodies in combination with AVD chemotherapy is highly effective across risk-groups. Based on encouraging phase II and ongoing phase III trials, anti-PD1 based first-line treatment may hence soon become a first-line treatment option. To date, no data on fertility and gonadal function after anti-PD1 based first-line HL treatment is available. Herein, we present data on pregnancies and gonadal function in patients treated within the randomized GHSG phase II NIVAHL trial.