Very common adverse reactions observed during the three most relevant clinical trials with LITAK in 279 patients treated for various indications and in 62 patients with hairy cell leukaemia (HCL) were myelosuppression, especially severe neutropenia (41% (113/ 279), 98% (HCL, 61/ 62)), severe thrombocytopenia (21% (58/ 279), 50% (HCL, 31/ 62)) and severe anaemia (14% (21/ 150), 55% (HCL, 34/ 62)), as well as severe immunosuppression/ lymphopenia (63% (176/ 279), 95% (HCL, 59/ 62)), infections (39% (110/ 279), 58% (HCL, 36/ 62)) and fever (up to 64%).