Fig. 4. In vitro PTT of SPNS (a) and Pd@Au (b) (n = 8 for each group). The temperature increases of tumor sites upon laser irradiation after intravenous injection with SPNS and Pd@Au (c). In vivo PTT of SPNS and Pd@Au (d) and the tumor growth curves in different treatment groups (e) (n = 4 for each group). Asterisks suggest statistically significant differences (*P < 0.05, **P < 0.01, and ***P < 0.001).
