Fast-Clearable Nanocarriers Conducting Chemo/Photothermal Combination Therapy to Inhibit Recurrence of Malignant Tumors

Inhomogeneous heating by photothermal therapy (PTT) during cancer treatment often results in the recurrence of tumors. Thus, integrating PTT with chemotherapy (CHT) may provide a complementary treatment for enhanced therapeutic efficiency. Herein, this study develops a hollow structured polymer-silica nanohybrid (HPSN) as a nanocarrier to simultaneously deliver the anticancer drug paclitaxel and photothermal agent palladium phthalocyanine to tumors through enhanced permeation and the retention effect. A combinational CHT/PTT therapy on mice bearing aggressive tumor grafts is conducted. The highly malignant tumor model, which recurs after sole treatment of PTT, can be eradicated by the combined CHT/PTT treatment. In addition, most of the off-targeted HPSN nanocarriers can be excreted through a hepatobiliary pathway in about 10 d. Serology results show that the fast-clearable HPSN can significantly reduce the side effect of the loaded paclitaxel drug. The present work provides an alternative approach for combinational cancer treatment with high therapeutic efficiency.