Urbini, M., Eleveld, T. F., Polano, M., Scarpi, E., Menna, C., Gianni, C., Janssen, F. W., Schepisi, G., Gurioli, G., Kucerova, L., Gillis, A. J., Virga, A., Bleve, S., Rosti, G., Ulivi, P., Mego, M., Looijenga, L. H., Giorgi, U. D. (2026). Reply to: Time-Varying Effects of Copy Number Alteration Clustering: Methodologic Concerns in Survival Analysis of Relapsed/Refractory Germ Cell Tumors. Journal of Clinical Oncology. https://doi.org/10.1200/jco-26-01154