For one of these tumors, coming from a paediatric high-grade sarcoma (PT16Tumor), a cell line has been successfully derived that we classified as TEL+ based on hTERT and hTR expression (Fig. 5a), lack of C-circle production (Fig. 5b), absence of APBs (Fig. 5c), and telomere length homogeneity (Fig. 5d). Here, ETV6 is linked to sarcoma.