Baricitinib in the Treatment of Kohlmeier-Degos Disease in Patients With Neurological Involvement

Study Description:

This phase II study will provide off-label baricitinib treatment in patients with Kohlmeier Degos disease (K-D) with neurologic involvement. We will perform a baseline research evaluation at the time of enrollment and follow each patient for 12 weeks of background therapy (defined as medications taken by the subject for management of Degos symptoms) followed by 24 weeks of baricitinib treatment (4 mg daily) in addition to background therapy followed by 4 additional weeks of background therapy with final safety assessment at 40 weeks. We will repeat research evaluations at the end of weeks 12, 24, and 36. We will compare the disease progression between weeks 1 through 12 to weeks 13 through 24 as well as weeks 13 through 36. We hypothesize that baricitinib, which targets type I interferon (IFN) and IFN-g signaling, will attenuate various neurological manifestations of K-D that are observed clinically, radiologically or in abnormal laboratory findings in our KD patients. This will help reduce IFN signaling in a manner that may slow or halt the disease progression as measured by the endpoints established below.

Objectives:

Primary Objective:

To test whether baricitinib delays progression of neuroradiological manifestations in patients with neurological involvement of K-D disease.

Secondary Objectives:

To test whether baricitinib treatment improves patient-reported outcomes.

Exploratory Objectives:

• Assess changes in immune cell proportion using single cell Ribonucleic Acid (RNA) sequencing (scRNA-seq) in biospecimens such as skin, cerebrospinal fluid (CSF) and blood after 12 and 24 weeks of baricitinib treatment compared to 12 weeks of just background therapy
• Assess changes in plasma/serum cytokine levels and IFN scores as well as biomarker assays in CSF/blood samples after 12 and 24 weeks of baricitinib treatment compared to 12 weeks of just background therapy.
• To assess whether 12 or 24 weeks of baricitinib treatment will stabilize or improve clinical neurologic exams.
• To assess whether 12 or 24 weeks of baricitinib treatment compared to 12 weeks of just background therapy will reduce the number of new acute K-D skin lesions or slow/halt the progression of existing K-D skin lesions. To assess whether 12 or 24 weeks of baricitinib treatment will reduce the number of new acute K-D skin lesions or slow/halt the progression of existing K-D skin lesions.

Endpoints:

• The primary endpoint will assess the stability of existing enhancing lesions or the lack of development of new enhancing lesions in the brain and spine observed by Magnetic Resonance Imaging (MRI) after 12 or 24 weeks of baricitinib treatment (4 milligrams [mg] daily) compared to existing enhancing lesions observed over 12 weeks of background therapy.
• The secondary endpoints will assess the change over 12 and 24 weeks of baricitinib treatment as compared to 12 weeks of background therapy only for the following outcomes: self-reported outcome measures based on health-related questionnaire ( SF-36 ).
• Exploratory endpoints of this study will be clinical and potential surrogate biomarker efficacy data, including:

• Changes in transcriptome/ribonucleic acid (RNA) expression determined by scRNA-seq in skin, CSF and peripheral blood mononuclear cells (PBMCs) after 12 or 24 weeks of baricitinib treatment as compared to 12 weeks of background therapy only.
• Attenuation of plasma/serum cytokine levels and IFN scores as well as biomarkers in assays using CSF and blood samples after 12 and 24 weeks of baricitinib treatment as compared to 12 weeks of background therapy.
• Stability or improvement of motor and/or sensory function on clinical neurologic exams after the 12 or 24 weeks of baricitinib treatment as compared to 12 weeks of background therapy only.
• Changes in the number of new acute K-D skin lesions or slowing/halting progression of existing K-D skin lesions after 12 or 24 weeks of baricitinib treatment as compared to 12 weeks of background therapy only.

• INCLUSION CRITERIA:

In order to be eligible to participate in this study, an individual must meet all of the following criteria:

• Provision of signed and dated informed consent form by the subject or Legally Authorized Representative (LAR).
• Stated willingness to comply with all study procedures and availability for the duration of the study.
• Male or female, aged 18 or older.
• Subjects diagnosed with systemic Degos disease, who manifest neurologic abnormalities observed clinically, radiologically or in abnormal laboratory findings.
• Ability to take oral medication and be willing to adhere to the baricitinib regimen.
• For female patients of reproductive potential, non-pregnant, non-breastfeeding: agree to use of highly effective contraception for the duration of the study and 30 days after the last dose.
• Ability of subject or LAR to understand and the willingness to sign a written informed consent document.

Exclusion criteria

• Active infection not responding to appropriate therapy
• Hemoglobin <7 g/dL
• Platelet counts < 50 K /mcL
• Neutropenia (ANC <0.5 x k/mcL)
• Lymphopenia (Absolute Lymphocyte Count [ALC] <0.2x k/mcL)
• Liver function tests (LFTs > 2x time upper limit of normal)
• Estimated Glomerular Filtration Rate (eGFR)/Creatinine (Cr < 30 mL/min)
• Have experienced any of the following within 12 weeks of screening: VTE (DVT/pulmonary embolism [PE]), myocardial infarction (MI), unstable ischemic heart disease, stroke, or New York Heart Association Stage III/IV heart failure.
• Have had symptomatic herpes zoster infection within 12 weeks prior to a enrolling in the study .
• Have had household contact with a person with active TB and did not receive appropriate and documented prophylaxis for TB.
• Have evidence of active TB or latent TB
• Have been exposed to a live vaccine within 12 weeks of baricitinib treatment or are expected to need/receive a live vaccine during the course of the study
• No gadolinium based contrast agent exposure is permitted if eGFR < 30 mL/min/1.73m^2 using the CKD-EPI equation measured within 5 days .
• Breast feeding
• Pregnancy
• Uncontrolled malignancy