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The Telomere and Telomerase Group at the Spanish National Cancer Research Centre (CNIO) has shown that it is possible to block the growth of human and murine glioblastoma in mouse models by blocking the TRF1 protein, an essential component of the telomere-protective complex known as shelterin. The study, published in Cancer Cell, describes a new and promising way to combat this type of brain tumour, considered one of the most lethal and difficult to treat, by attacking its ability to regenerate and divide immortally.