Figure 2.

Interleukin-6 suppresses the radiation-induced cell death of OSCC cells.The survival fraction of SAS cells (A) and HSC-2 cells (B) after exposure to 6 Gy of X-rays was evaluated by a modified HDS assay under various concentrations of IL-6 (0, 50, and 200 pg ml⁻¹). The results are shown as the means±s.d. of three independent experiments. **P<0.01. (C and D) The photographs of the cell survival fraction as evaluated by a clonogenic assay. After exposure to 6 Gy of X-rays, the SAS and HSC-2 cells were seeded in 60 mm culture dishes under treatment with 0 or 100 pg ml⁻¹ IL-6, and incubated. After 10 days' culture, the cells were fixed and visualised.