This study is a phase IIa open label pilot study of up to six months treatment with clemizole hydrochloride (200 mg vs. 300 mg vs. 400 vs. 500 mg mg) given orally TID to subjects with hepatocellular carcinoma that are either awaiting transplantation or have an unresectable lesion.

The primary objectives of the study are to:

• Evaluate the safety and tolerability of up to six months of treatment with clemizole hydrochloride (200 mg vs. 300 mg vs. 400 mg vs. 500 mg TID by mouth) in subjects diagnosed with hepatocellular carcinoma that are either awaiting transplantation or have an unresectable lesion.
• Evaluate the overall tumor response according to radiologic assessments of stable disease, complete response (CR), partial response (PR), or minor response (MR), as defined by Response Evaluation Criteria in Solid Tumors (RECIST), associated with clemizole hydrochloride (200 mg vs. 300 mg vs. 400 mg vs. 500 mg, TID by mouth)
• Evaluate the pharmacokinetic (PK) activity of clemizole hydrochloride (200 mg vs. 300 mg vs. 400 mg vs. 500 mg, TID by mouth)

The secondary objectives of the study are to:

• Evaluate the duration of response, time to progression, duration of stable disease (SD), and overall survival associated with clemizole hydrochloride (200 mg vs. 300 mg vs. 400 mg vs. 500 mg, TID by mouth)

Inclusion Criteria:

1. Males or females, at least 18 years of age.

2. Subjects should have a diagnosis (histologically proven) of hepatocellular carcinoma (that is measurable on CT or MR with contrast) and are either awaiting transplantation or have an unresectable lesion for which they have not received prior experimental systemic treatments for HCC and no additional therapy is planned.

3. Eastern Cooperative Oncology Group performance status of 2 or less.

4. Child-Pugh (CP) score of A or B.

5. Life expectancy of at least 12 weeks.

6. Elevated alphafetoprotein (AFP) level .

7. Adequate hematologic (platelet count, ≥60 ; hemoglobin, ≥8.5 g per deciliter; and prothrombin time international normalized ratio, ≤2.3; or prothrombin time, ≤6 seconds above control), hepatic (albumin, ≥2.8 g per deciliter; total bilirubin, ≤3 mg per deciliter [51.3 μmol per liter]; and alanine aminotransferase and aspartate aminotransferase, ≤5 times the upper limit of the normal range), and renal (serum creatinine, ≤1.5 times the upper limit of the normal range) function.

8. Electrocardiogram (ECG) showing no acute ischemia or clinically significant abnormality and a QT/QTc interval <450 milliseconds for males or <470 milliseconds for females using Bazett's correction (QTc =QT/RR0.5;ICH Guidance E14 Clinical Evaluation of QT/QTc Interval Prolongation and Proarrhythmic Potential for Non-Antiarrhythmic Drugs)

9. Females of childbearing potential (intact uterus and within one year since the last menstrual period) should be non-lactating and have a negative serum pregnancy test. In addition, all subjects (male and female) and their sexually active partners should agree to use one of the following acceptable birth control methods throughout the study:

   1. surgical sterilization (bilateral tubal ligation, hysterectomy, bilateral oophorectomy) six month minimum
   2. IUD in place for at least three months
   3. barrier methods (condom or diaphragm) with spermicide
   4. surgical sterilization of the partner (vasectomy for six months)
   5. hormonal contraceptives for at least three months prior to the first dose of study drug

10. Willing and able to comply with study procedures and provide written informed consent

Exclusion Criteria:

1. Participation in a clinical trial with or use of any investigational agent within 30 days of Study Visit 1

2. Patients co-infected with HIV

3. Patients with screening tests positive for anti-HIV Ab

4. Patients with tumors of mixed histology or fibrolamellar variant,

5. Pregnant or lactating women,

6. Patients requiring systemic anticancer therapy, or biologic-response modifiers

7. Medical/psychological/social problems that might affect study participation or evaluations

8. Eating disorder or alcohol abuse within the past two years, excessive alcohol intake (>20 g per day for females (1.5 standard alcohol drinks) or >30 g per day for males (2.0 standard alcohol drinks) (a standard drink contains 14 g of alcohol: 12 oz of beer, 5 oz of wine or 1.5 oz of spirits) (1.0 fluid oz (US) = 29.57 mL) or if in the opinion of the investigator, an alcohol use pattern that will interfere with study conduct

9. Drug abuse within the last six months

10. Patients with absolute neutrophil count (ANC) <1500 cells/mm3;

11. Abnormal TSH, T4 or T3

12. History or clinical evidence of any of the following:

    1. variceal bleeding, difficult to treat ascites, hepatic encephalopathy, CTP score >8,
    2. immunologically mediated disease (e.g, rheumatoid arthritis, inflammatory bowel disease, severe psoriasis, systemic lupus erythematosus) requiring more than intermittent non-steroidal anti-inflammatory medications for management or that requires frequent or prolonged use of corticosteroids (inhaled asthma medications are allowed)
    3. significant or unstable cardiac disease (e.g., angina, congestive heart failure, uncontrolled hypertension, history of arrhythmia)
    4. chronic pulmonary disease (e.g., chronic obstructive pulmonary disease) associated with functional impairment
    5. severe or uncontrolled psychiatric disease, including severe depression, history of suicidal ideation, suicidal attempts or psychosis requiring medication and/or hospitalization

13. Patients with a body mass index of >30 kg/m2

14. Chronic use of concomitant drugs known to prolong the QT interval (See Appendix E)

15. Concomitant use of immunosuppressive or immune modulating agents

16. Patients with any serious condition that, in the opinion of the investigator, would preclude evaluation of response or make it unlikely that the contemplated course of therapy and follow-up could be completed or increase the risk to the subject of participation in the trial