Abstract LB023: A novel oral Paclitaxel delivery strategy and softgel capsule product for improving cancer therapeutics

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Abstract The therapeutic efficacy of a novel oral Paclitaxel formulation was evaluated and compared in Balb/c nude mice bearing PDX NSCLC, gastric cancer, liver cancer, breast cancer, and ovarian cancer treated with Abraxane, Taxol, Lenvatinib and Sorafenib. Therapeutic parameters including tumor volume, tumor growth inhibition (TGI), and treatment-to-control ratio (T/C) were compared among different treatment groups. The drug tolerance, cytotoxicity and safety profile of the oral Paclitaxel formulations were evaluated in Balb/c nude mice and beagle dogs. The tumor distribution of Paclitaxel in NCI-N87 gastric cancer-bearing mice after administration of oral Paclitaxel formulation and Paclitaxel Injection was investigated. The oral Paclitaxel formulation administrated at 100 mg/Kg demonstrated significant better therapeutic efficacy than Albumin-bound Paclitaxel for Injectable Suspension at 30 mg/Kg and Paclitaxel Injection at 15 mg/Kg for NCI-N87 gastric cancer-bearing mice, while the same 100 mg/Kg dose demonstrated noninferior therapeutic efficacy to Abraxane and significant better therapeutic efficacy than Taxol in Hs467T gastric cancer-bearing mice. The oral Paclitaxel formulation administrated at 180 mg/Kg demonstrated noninferior therapeutic efficacy compared with Lenvatinib at 40 mg/Kg, and significant better therapeutic efficacy than Sorafenib at 30 mg/Kg for Hep G2 liver cancer-bearing mice, while the oral paclitaxel at 180 mg/Kg showed inferior therapeutic efficacy than Lenvatinib at 30 mg/Kg but noninferior therapeutic efficacy to Sorafenib at 30 mg/Kg for Huh-7 liver cancer-bearing mice. The oral Paclitaxel formulation administrated at 100 mg/Kg demonstrated significant better therapeutic efficacy than Abraxane for Injectable Suspension at 30 mg/Kg and Taxol at 15 mg/Kg for NCI-H358 NSCLC-bearing mice. The oral Paclitaxel formulation administrated at 100 mg/Kg demonstrated noninferior therapeutic efficacy to Abraxane for Injectable Suspension at 30 mg/Kg and significant better therapeutic efficacy than Taxol at 15 mg/Kg for MDA-MB-231 breast cancer-bearing mice. The oral Paclitaxel formulation administrated at 100 mg/Kg demonstrated noninferior therapeutic efficacy to Abraxane at 30 mg/Kg and significant better therapeutic efficacy than Taxol at 15 mg/Kg for SK-OV-3 ovarian cancer-bearing mice. The gastric tumor distribution of Paclitaxel between 6-24 hour was similar after oral and intravenous administration. The Maximum Tolerated Dose (MTD) of the oral Paclitaxel was determined to be ≥ 200 mg/Kg in mice and ≥ 8.0 mg/Kg in beagle dogs when dosing at Q3DX3Weeks, there were no significant body weight losses, tissue damages and animal death observed during the long-term safety assessment study. The oral Paclitaxel formulation demonstrated better or noninferior therapeutic efficacy in five different PDX tumor-bearing mice compared with standard treatment drugs, good safety and low cytotoxicity at high doses in long-term safety and toxicity studies were observed in both mice and beagle dogs. The oral Paclitaxel formulation showed promising therapeutic potential for various cancer treatment and conducting “chemotherapy at home” with lower medical costs. Citation Format: Hui Yu Huang, Richard Jun Huang. A novel oral Paclitaxel delivery strategy and softgel capsule product for improving cancer therapeutics [abstract]. In: Proceedings of the American Association for Cancer Research Annual Meeting 2024; Part 2 (Late-Breaking, Clinical Trial, and Invited Abstracts); 2024 Apr 5-10; San Diego, CA. Philadelphia (PA): AACR; Cancer Res 2024;84(7_Suppl):Abstract nr LB023.