To evaluate the safety, tolerability, and long-term efficacy of bryostatin 1 (hereafter referred to as bryostatin) for the treatment of moderately severe Alzheimer's disease (AD).

This is a randomized double-blind placebo-controlled, Phase 2 study comparing bryostatin-1 to placebo for long-term efficacy in the treatment of moderately severe AD (Mini Mental State Examination, 2nd edition scores of 10-18 at baseline) in the absence of memantine. Eligible subjects will receive 7 doses of bryostatin (i.v., 20μg) or matching placebo during the first 12 weeks. A second course of treatment consisting of 7 doses will begin 30 days after the final dose of the first treatment period. Cognitive tests will be assessed at intervals during the study and 4 months after the final dose of study drug. The primary endpoint is the total SIB score assessment obtained at Week 28, following completion of 2 courses of treatment.

Inclusion Criteria:

1. Written informed consent from caregiver and subject (if possible) or legally acceptable representative if different from caregiver

2. Male and female subjects 55-85 years of age inclusive

3. Cognitive deficit present for at least 2 years that meet the diagnostic criteria for probable Alzheimer's dementia. The diagnosis must be confirmed at the time of the screening visit

4. MMSE-2 score of 10-18 inclusive (applies to Screening Visit only)

5. Patients must have a baseline SIB total score of at least 60 and may not have a SIB score >93 at screening

6. Neuroimaging computerized tomography (CT) or Magnetic Resonance Imaging (MRI) within the last 24 months consistent with a diagnosis of probable AD without any other clinically significant co-morbid pathologies. If there has been a significant change in the subject's clinical status since the last imaging study that is not consistent with progression of the subject's AD, an imaging study should be performed to confirm eligibility

7. Reliable caregiver(s) or informant(s) who attends the subject at least an average of 3 hours or more per day for 3 or more days per week and who will agree to accompany the subject to the clinic visits and reliably complete the caregiver questions

8. Adequate vision and motor function to comply with testing

9. If taking an approved cholinesterase inhibitor for treatment of Alzheimer's disease, must be on a stable dose for at least 3 months prior to entry into study and the dose must not change during the study unless a change is required due to an adverse effect of the prescribed medication or a clinically significant change in the patient's status

10. Subjects who are memantine naïve or have been off memantine for at least 90 days prior to initial treatment with study drug

11. Subjects on neuroleptic medications must be on a stable dose for ≥4 weeks at screening (dose adjustments will be permitted if medically necessary at the discretion of the PI)

12. Females participating in the study must meet one the following criteria:

    1. Surgically sterilized (e.g., hysterectomy, bilateral oophorectomy or tubal ligation) for at least 6 months or postmenopausal (postmenopausal females must have no menstrual bleeding for at least 1 year) or
    2. If not postmenopausal, agree to use a double method of contraception, one of which is a barrier method (e.g., intrauterine device plus condom, spermicidal gel plus condom) 30 days prior to dosing until 30 days after last dose and have negative human chorionic gonadotropin (β-hCG) test for pregnancy at screening

13. Males who have not had a vasectomy must use appropriate contraception methods (barrier or abstinence) from 30 days prior to dosing until 30 days after last dose

14. In the opinion of the PI subjects should be in reasonably good health over the last 6 months and any chronic disease should be stable -

Exclusion Criteria:

Eligibility Criteria:

Inclusion

1. Written informed consent from caregiver and subject (if possible) or legally acceptable representative if different from caregiver 2. Male and female subjects 55-85 years of age inclusive 3. Cognitive deficit present for at least 2 years that meet the diagnostic criteria for probable Alzheimer's dementia. The diagnosis must be confirmed at the time of the screening visit 4. MMSE-2 score of 10-18 inclusive (applies to Screening Visit only) 5. Patients must have a baseline SIB total score of at least 60 and may not have a SIB score >93 at screening 6. Neuroimaging computerized tomography (CT) or Magnetic Resonance Imaging (MRI) within the last 24 months consistent with a diagnosis of probable AD without any other clinically significant co-morbid pathologies. If there has been a significant change in the subject's clinical status since the last imaging study that is not consistent with progression of the subject's AD, an imaging study should be performed to confirm eligibility 7. Reliable caregiver(s) or informant(s) who attends the subject at least an average of 3 hours or more per day for 3 or more days per week and who will agree to accompany the subject to the clinic visits and reliably complete the caregiver questions 8. Adequate vision and motor function to comply with testing 9. If taking an approved cholinesterase inhibitor for treatment of Alzheimer's disease, must be on a stable dose for at least 3 months prior to entry into study and the dose must not change during the study unless a change is required due to an adverse effect of the prescribed medication or a clinically significant change in the patient's status 10. Subjects who are memantine naïve or have been off memantine for at least 90 days prior to initial treatment with study drug 11. Subjects on neuroleptic medications must be on a stable dose for ≥4 weeks at screening (dose adjustments will be permitted if medically necessary at the discretion of the PI) 12. Females participating in the study must meet one the following criteria:

1. Surgically sterilized (e.g., hysterectomy, bilateral oophorectomy or tubal ligation) for at least 6 months or postmenopausal (postmenopausal females must have no menstrual bleeding for at least 1 year) or

2. If not postmenopausal, agree to use a double method of contraception, one of which is a barrier method (e.g., intrauterine device plus condom, spermicidal gel plus condom) 30 days prior to dosing until 30 days after last dose and have negative human chorionic gonadotropin (β-hCG) test for pregnancy at screening 13. Males who have not had a vasectomy must use appropriate contraception methods (barrier or abstinence) from 30 days prior to dosing until 30 days after last dose 14. In the opinion of the PI subjects should be in reasonably good health over the last 6 months and any chronic disease should be stable Exclusion

   1. Dementia due to any condition other than AD, including vascular dementia (Rosen-Modified Hachinski Ischemic score ≥ 5)
   2. Evidence of significant central nervous system (CNS) vascular disease on previous neuroimaging including but not limited to: cortical stroke, multiple infarcts, localized single infarcts in the thalamus, angular gyrus, multiple lacunar infarcts or extensive white matter injury
   3. Clinically significant neurologic disease or condition other than AD, such as cerebral tumor, chronic subdural fluid collections, Huntington's Disease, Parkinson's Disease, normal pressure hydrocephalus, or any other diagnosis that could interfere with assessment of safety and efficacy
   4. Evidence of clinically significant unstable cardiovascular, pulmonary, renal, hepatic, gastrointestinal, neurologic, or metabolic disease within the 6 months prior to enrollment. If there is a history of cancer the subject should be clear of cancer for at least 2 years prior to screening. More recent history of basal cell or squamous cell carcinoma and melanoma in situ (Stage 0) may be acceptable after review by the Medical Monitor.
   5. Creatinine clearance (CL) of <45ml/min
   6. Poorly controlled diabetes, at the discretion of the Principal Investigator
   7. Concomitant treatment with NMDA receptor antagonists such as but not limited to memantine or drug combinations containing memantine, dextromethorphan (a cough suppressant), ketamine, phencyclidine (PCP), methoxetamine (MXE), nitrous oxide (N2O) and the following synthetic opioids: penthidine, levorphanol, methadone, dextrpropoxyphene, tramadol, and ketobemidone.
   8. Use of vitamin E > 400 International Units (IU) per day within 14 days prior to screening
   9. Use of acetaminophen within 14 days prior to screening
   10. Use of gabapentin within 14 days prior to screening
   11. Use of valproic acid within 14 days prior to screening
   12. Use of an active Alzheimer's vaccine within 2 years prior to screening
   13. Use of a monoclonal antibody for treatment of AD within 1 year prior to screening
   14. Any medical or psychiatric condition that is likely to require initiation of additional medication or surgical intervention during the course of the study
   15. Any screening laboratory values outside the reference ranges that are deemed clinically significant by the PI
   16. Use of an investigational drug within 90 days prior to screening
   17. Suicidality defined as active suicidal thoughts during the 6 months prior to screening or at Baseline [Type 4 or 5 on C-SSRS], or history of suicide attempt in previous 2 years, or at serious suicide risk in PI's judgment
   18. Major psychiatric illness such as current major depression according to Diagnostic and Statistical Manual of Mental Disorders, 5th Edition , current or past diagnosis of bipolar disorder, schizophrenia, or any other psychiatric disorder that might interfere with the assessments of safety or efficacy at the discretion of the PI
   19. Diagnosis of alcohol or drug abuse within the last 2 years
   20. Abnormal laboratory tests that suggest an alternate etiology for dementia. If the patient has prior history of serum B12 abnormality, anemia with hemoglobin ≤10g/dl, thyroid function abnormality, electrolyte abnormality, or positive syphilis serology the patient should be revaluated to determine if these potential causes of dementia have been addressed. Only if these causes have been ruled out as the cause of the dementia can the patient be enrolled.
   21. History of prolonged QT or prolonged QT on screening ECG (QTcB or QTcF >499 per central reader)
   22. Acute or poorly controlled medical illness: blood pressure > 180 mmHg systolic or 100 mmHg diastolic; myocardial infarction within 6 months; uncompensated congestive heart failure [New York Heart Association (NYHA) Class III or IV]
   23. Known to be seropositive for human immunodeficiency virus (HIV)
   24. Known to be seropositive for Hepatitis B or C, unless successful curative treatment for Hepatitis C (e.g., Harvoni) has been received and there is documentation that there is no Hep B/C virus detected 3 months after completion of treatment
   25. AST or ALT >3x upper limit of normal (ULN) and total bilirubin >2x ULN or International Normalized Ratio (INR) >1.5
   26. Prior exposure to bryostatin, or known sensitivity to bryostatin or any ingredient in the study drug
   27. Any other concurrent medical condition, which in the opinion of the PI makes the subject unsuitable for the clinical study -

Sponsor, investigators and staff, and the clinical research organization are all blinded to study treatment assignment.