Supplementary Material for: The Novel Biomarker of Germ Cell Tumours, Micro-RNA-371a-3p, Has a Very Rapid Decay in Patients with Clinical Stage 1 Radtke A. Hennig F. Ikogho R. Hammel J. Anheuser P. Wülfing C. Belge G. Dieckmann K.-P. 10.6084/m9.figshare.6188849.v1 https://karger.figshare.com/articles/dataset/Supplementary_Material_for_The_Novel_Biomarker_of_Germ_Cell_Tumours_Micro-RNA-371a-3p_Has_a_Very_Rapid_Decay_in_Patients_with_Clinical_Stage_1/6188849 <b><i>Background:</i></b> Accumulating evidence suggests serum levels of microRNA (miR)-371a-3p to be a novel tumour marker of testicular germ cell tumours (GCTs). Presently, there is only limited information regarding the velocity of decline of serum levels in response to treatment. <b><i>Patients and Methods:</i></b> Twenty-four patients with testicular GCT (20 seminoma, 4 nonseminoma, median age 40 years) with clinical stage 1 had measurements of serum levels of miR-371a-3p preoperatively and repeatedly on the following 3 days. Three had additional tests done within 24 h after surgery. Measurement results were analysed using descriptive statistical methods. <b><i>Results:</i></b> Serum levels dropped to 2.62, 1.27, and 0.47% of the preoperative level within 1, 2, and 3 days, respectively. The computed half-life amounts to 3.7–7 h. The velocity of decay is significantly associated with tumour size. <b><i>Conclusions:</i></b> Serum-levels of miR-371a-3p have a short half-life of less than 12 h. The rapid decay after treatment represents a valuable feature confirming the usefulness of miR-371a-3p as a valuable serum biomarker of GCT. 2018-04-26 12:10:54 Germ cell tumour Seminoma Nonseminoma MicroRNA-371a-3p Serum biomarker