Table 3. The combined effect on HepG2 cells was assayed, and calculated according to the method of Valeriote and Lin and Carpentier.

Radiation (Gy)	SFR	SFR+S	SFR x SFS
2	0.40	0.27 (Synergism)	0.40
4	0.30	0.10 (Synergism)	0.21
6	0.21	0.05 (Synergism)	0.15
8	0.05	0.01 (Synergism)	0.04
10	0.01	0.001 (Synergism)	0.007

The surviving fraction of sorafenib is 0.7.