XIST and nasopharyngeal carcinoma: These data demonstrate progressive Xist-mediated silencing over time in all tested NPC clones, even if a direct comparison of silencing dynamics between clone E6 and clones CL30 and CL31 is limited by the lower number of escapees in CL30 (61) and CL31 (48) compared with clone E6 (133) (Fig. 1g, Extended Data Fig. 1i and Extended Data Fig. 2f,h).