Company: MDCXW
Filing Date: 2025-09-19
Form Type: DRS
Source: 0001062993-25-015719
Chunk: 128

Company: Medicus Pharma Ltd.
Filing Date: 2025-09-19
Form: DRS
Chunk 128
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. Thus, primary irritation would not be expected to have affected the LLNA stimulation indices.

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CONFIDENTIAL TREATMENT REQUESTED BY MEDICUS PHARMA LTD.PURSUANT TO 17 C.F.R. SECTION 200.83</div>

It was not possible to calculate a threshold positive response (EC3 potency) in the current study since all test article stimulation index values were below 3, thus, the test article containing D-MNA constituents (doxorubicin in DMSO, CMC and excipients) was not considered a sensitizer under the conditions of this study.

Irritation and Pyrogenicity Study in the New Zealand Rabbit

Experience in a pilot trial (SRC Study No. S15198) using this rabbit species with the dissolvable, tip-loaded microneedle array of doxorubicin indicated that the microneedle array was not suitable for the NZW rabbits.

Consequently, SkinJect decided to test the pre-molding array formulation, i.e., the gel consisting of doxorubicin, carboxy methylcellulose, trehalose, citric acid, dibasic sodium phosphate, and deionized water, on the New Zealand rabbit in this GLP study (SRC Study No. S15054). This approach provided a method for testing all gel components for their pyrogenic and irritation potential. The objective of this study was to evaluate the test article (doxorubicin and excipients) for pyrogenicity following subcutaneous (SQ) injection, and for local skin irritation potential after topical dose administration of various dose concentrations on NZW rabbits.

A total of 15 male NZW rabbits were randomized into one of five treatment groups, including a vehicle control (Group 1), three dose levels of test article (Groups 2-4), and a reference control (Group 5). This study was conducted in two phases as follows:

Pyrogenicity Phase: Pyrogenicity of the test article was evaluated at dose levels of 50, 100 and 200 μg (0.3 ml/animal). On dosing phase Day 1, the vehicle or test article formulations were administered via SQ injection to the scapular area of each animal (Groups 1-4). Group 5 animals were intravenously administered lipopolysaccharide (LPS, 0.01μg/ml) at 0.04 ml/kg and 4 ml/kg within ~