Figure 6. TERF2 down-regulation sensitized CAL33 to erlotinib/Tarceva and cetuximab/Erbitux. Clonal growth of CAL33-shC, sh1 and sh2 cells in the absence or presence of 6 nmol/L cetuximab (CX) or of 0.1 mol/L erlotinib (E). The number of colonies in the absence of drugs for each cell line was considered as the reference value (100%). ***P < 0.001.
