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In recent years, combining different types of therapy has emerged as an advanced strategy for cancer treatment. In these combination therapies, oral delivery of anticancer drugs is more convenient and compliant. This study developed an irinotecan/rapamycin-loaded oral lecithin-based self-nanoemulsifying nanoemulsion preconcentrate ( LB SNENP ir/ra ) and evaluated its synergistic combination effects on pancreatic cancer. LB SNENP loaded with irinotecan and rapamycin at a ratio of 1:1 ( LB SNENP ir10/ra10 ) had a better drug release profile and smaller particle size (&lt;200 nm) than the drug powder. Moreover, LB SNENP ir10/ra10 exhibited a strong synergistic effect (combination index [CI] &lt; 1.0) in cell viability and combination effect studies. In the tumor inhibition study, the antitumor activity of LB SNENP ir10/ra10/sily20 against MIA PaCa-2 (a human pancreatic cancer cell line) was significantly increased compared with the other groups. When administered with rapamycin and silymarin, the area under the curve and the maximum concentration of irinotecan significantly improved compared with the control. We successfully developed an irinotecan/rapamycin-loaded oral self-nanoemulsifying nanoemulsion system to achieve treatment efficacy for pancreatic cancer.

Synergistic Combination of Irinotecan and Rapamycin Orally Delivered by Nanoemulsion for Enhancing Therapeutic Efficacy of Pancreatic Cancer