Figure 4.
Fractionated radiation treatment enhancement by rational scheduling of mild temperature hyperthermia. B16F10 tumour volumes after hyperthermia, radiation or combination treatments (A). Tumour-bearing animals were treated with control (-■-), heat (-▼-, 41.5°C 60 min on days 7 and 8; indicated by arrowhead), radiation (-▲-, 5 Gy, day 8 and 9, indicated by diamond arrow tail), or combined (-◇-). Data are plotted as means ± SEM over time with third order polynomial line fitting. Efficacy determination of combination therapy of heat and fractionated radiation (B). The following formula was applied to determine efficacy [21]: the expected tumour growth inhibition from combination treatment (tumour growth inhibition by hyperthermia × tumour growth inhibition by radiation) / observed tumour growth inhibition. A ratio >1 indicates a synergistic (greater than additive) effect.