Study for the Use of TKIs for Treatment of Cognitive Decline Due to Degenerative Dementias

In order for a subject to be considered for this study, the following criterion is required:

• Cognitive decline with mild cognitive impairment (Clinical Dementia Rating Stage 0.5) through moderate dementia (CDR Stages 1 and 2)

All patients, according to routine best practices will have an evaluation including neurological interview and examination to screen for reversible causes of cognitive change such as depression, substance abuse, vitamin deficiency and systemic illness. All patients will have a Beck Depression scale and blood tests for B12 and thyroid hormone. Patients will have an EKG, in particular to screen for QT prolongation which is a relative counterindication for use of tyrosine kinase inhibitor therapy.

According to the package insert for bosutinib, the investigators are proposing to use an age range and dosage route that is comparable and overlapping with routine application of this drug. In addition, the investigators are proposing dosage ranges that are substantially lower than usually recommended for treatment of leukemia.

The QDRS scale will be given to all patients; a cut off score of 1.5 has been used qualify patients with a dementia score (CDR) of 0.5 (ref 19).

All patients will have a lumbar puncture for ABeta 42 and Tau proteins for Alzheimer's Spectrum. This spinal fluid examination has been shown to be both sensitive and specific for Alzheimer's disease (ref 20). Cerebrospinal fluid (CSF) tau levels are also elevated in alpha synucleinopathy and frontotemporal lobar degeneration (ref 21). The lumbar puncture is performed once at entry.

All patients will have an advanced MRI of the brain to include volume measurement of the hippocampus (ref 22), arterial spin labeling (ASL) perfusion scan (ref 23) and MRS of prefrontal, precuneus, hippocampus and occipital lobe. Patients with cognitive decline have decreased perfusion in temporal parietal or frontal regions of the brain with ASL perfusion, or show characteristic change in MRS or volumetric evaluation compared to aged matched control subjects. MRI will also demonstrate if patients have tumors, hydrocephalus, subdural hematomas and other structural etiologies of cognitive decline.

On entry, patients will have CDR stage of at least 0.5 and at least one abnormal imaging biomarker and none of the exclusion criteria below. Baseline, six months, twelve months, eighteen months and two year (completion) testing will include the Quick Dementia Rating System (QDRS) for staging and the following battery of tests:

• the Repeatable Battery for Assessment of Neuropsychological Status (RBANS),
• Standardized 25 foot timed gait test
• the Nine Hole Pegboard Test,
• Montreal Cognitive Assessment Test versions 1,2,3 (MOCA),
• Brain imaging will be repeated at one year and two years. CSF studies have demonstrated good sensitivity and specificity for mild cognitive impairment (MCI) and dementia of the Alzheimer's type (ref 5). MRI volumetrics, perfusion scans and magnetic resonance spectroscopy (MRS) have shown to be of excellent discriminating value among Alzheimer's dementia (AD), Parkinson's spectrum degeneration (PDD/DLB) and frontal temporal lobar degeneration (FTLD) subgroups and is responsive to change as patient's progress from MCI to dementia (ref 6).

The rationale behind this criterion is supported by the importance that the subject is cognitively able to effectively speak, listen, and read in English, and has the cognitive capacity to give informed consent.

All subjects will be started at 100 mg/day and the dose will be increased by 100 mg each month if the lower dose is tolerated without significant side effects. Adverse reactions will be scaled according to the CTCAE v.5. If the subject experiences severe adverse reactions at any dose, or if the subject requires dose reduction for toxicity from a dose of 100 mg/day, the subject will be removed from the study. If the subject experiences moderate adverse reactions at a dose >100 mg/day, the dose will be reduced by 100 mg and maintained at the lower dose for 1 month. If the subject experiences moderate or severe adverse reactions at this lower dose, the subject will be removed from the study. After 1 month, the dose will again be increased by 100 mg. If the subject does not experience any adverse reactions at this elevated dose, he/she will resume with the original up-titration schedule (i.e. increase by 100 mg every month up to 300 mg/day). If the subject experiences moderate symptoms at this elevated dose, the dose will again be reduced by 100 mg and will be maintained at this lower dose as the maximally tolerated dose.

The duration of treatment is 1 year. To minimize risk, subjects will be seen regularly for toxicity monitoring during the first month of treatment, and biweekly during the second month of treatment. On weeks when the subject is not in for a visit, subject status will be assessed on the basis of phone calls with the respective care taker. The care taker will be determined during the QDRS staging at the time of the initial consultation. The care taker is an individual who is intimately familiar and in close contact with the subject. After the first two months, visits will be on a monthly basis. Mild, moderate, and severe adverse reactions will be reported on an ongoing basis. The rationale for such extended administration is to allow for a more reliable assessment of tolerability. The primary endpoint in evaluating tolerability will be how many of the initial 20 subjects are discontinued due to adverse reactions. Subjects will be discontinued if they have moderate or severe adverse reaction ratings according to the CTCAE, which are not remediable by dosage reduction.