Autologous Natural Killer Cells in Subjects With Plaque Psoriasis

Nine (9) subjects, male or female, aged 18 years or older will be enrolled in the study, all of whom will receive "SNK01" without placebo control. There are three (3) subjects in each of the three (3) cohorts. The SNK01 study product will be administered at the following doses using dose escalating rules: Cohort 1 will receive 4 weekly infusions of 1 billion cells, Cohort 2 will receive 4 weekly infusions of 2 billion cells, and Cohort 3 will receive 4 weekly infusions of 4 billion cells. Length of participation, per subject, is approximately 12 weeks. The primary endpoint for safety is dose-limiting toxicity (DLT) which is defined as TEAE of grade ≥ 3 considered related to SNK01. Secondary safety endpoints include other adverse events (graded according to National Cancer Institute's Common Toxicity Criteria for Adverse Events [NCI-CTCAE v 5.0]), vital sign measurements, clinical laboratory tests and physical examination. Preliminary efficacy will be measured by Psoriasis Area Severity Index (PASI) and by the Physician's Global Assessment (PGA.

Inclusion criteria

Subjects will be considered eligible for participation in the study if all the following inclusion criteria are satisfied:

• Informed consent obtained before any "trial-related activities" (Trial-related activities are any procedure that would not have been performed during normal management of the subject)
• Diagnosis of plaque psoriasis for at least 6 months with at least one psoriatic plaque measuring between 2 cm and 5 cm at the time of screening
• If female, subject is either not of childbearing potential (postmenopausal for at least 1 year or surgically sterile) or is of childbearing potential and is using approved method of birth control throughout study and for 1 month after last dose of study drug. Approved methods of birth control include the following:

• Condoms, sponge, foams, jellies, diaphragm, or intrauterine device (IUD)
• Hormonal contraceptives for 90 days prior to study drug administration
• A vasectomized partner
• Subject must be able and willing to provide written informed consent and comply with requirements of this study protocol

Following Eligibility & Consent:

• Subject must be able to donate 130 ml to 490 ml of blood for NKMax America to obtain an adequate number of autologous NK cells necessary to establish the final investigational product
• Successful establishment of the final NK product, or "study therapy", established by NKMax America

Exclusion criteria

Subjects who fulfill any of the following criteria will not be recruited into the study:

• Subjects with severe medical condition(s) that in the view of the investigator prohibits participation in the study
• Subject has Netherton's syndrome or other genodermatoses that results in a defective epidermal barrier
• Subjects who have applied topical medication (prescription or over-the-counter) for the treatment of psoriasis to their body within 7 days of the baseline visit
• Subjects who have taken cyclosporine, methotrexate, immuran, oral retinoids, chemotherapeutic agents, anti-inflammatory biologics (e.g., alefacept, etanercept, etc.), or oral calcineurin inhibitors within 28 days of the whole blood donation visit for the establishment of the investigational product
• Subjects who are unable to hold their current psoriasis medications for the period of time indicated (at least 7 days for topical medications, at least 28 days for oral or injectable medications) without significant worsening of their psoriasis
• Immunocompromised subjects (e.g., lymphoma, HIV/AIDS, Wiskott-Aldrich Syndrome) or subjects with a history of malignant disease (excluding non-melanoma skin cancer) as determined by the participant's medical history
• Subjects receiving phototherapy (e.g., ultraviolet light B [UVB], psoralen plus ultraviolet light A [PUVA]) within 28 days of the baseline visit.
• Subjects with a history of psychiatric disease or history of alcohol or drug abuse that would interfere with the ability to comply with the study protocol.
• Subjects with significant concurrent medical condition(s) at screening that in the view of the investigator prohibits that in the view of the investigator prohibits participation in the study (e.g., severe concurrent allergic disease, condition associated with malignancy, and condition associated with immunosuppression)
• Subjects with an active bacterial, viral or fungal skin infection (excluding nail fungus)
• Ongoing participation in an investigational drug trial
• Presence of psoriasis with exfoliative erythroderma or presence of guttate psoriasis, primary palmoplantar psoriasis, or pustular psoriasis