A Phase II Study of Epigenetic Therapy to Overcome Chemotherapy Resistance in Refractory Solid Tumors

Eligible patients after signing informed consent will undergo study evaluation and acetylation status typing before being treated. Patients will begin treatment (day -7) with a daily dose of a slow-release formulation of hydralazine tablets containing either 182 mg for rapid-acetylators or 83 mg for slow-acetylators and slow-release tablets containing 700mg of magnesium valproate at a dose of 40mg/Kb t.i.d. Both hydralazine and magnesium valproate will be administered from day -7 until the last day of the last chemotherapy cycle. Chemotherapy will initiate at day 1 (after seven days of being taken hydralazine and magnesium valproate) with the same pre-study protocol regimen at which patients showed tumor progression. Toxicity will be evaluated after each course of chemotherapy. Response will be evaluated at the third course of chemotherapy. Promoter of selected genes will be evaluated by methylation-specific PCR in serum DNA before and after 7 days of treatment with hydralazine and valproate.

Inclusion criteria

• Aged18 years and older.
• Histologically proven malignant solid tumors who were receiving their second, third or fourth line of palliative chemotherapy and who showed at the second or third course progressive disease as their maximum response according to the RECIST criteria or to the IGCG CA125 criteria in case of ovarian cancer patients.
• Measurable disease defined by 1 of the following criteria: Any unidimensional measurable lesion ≥ 10 mm by standard MRI or CT scan for solid tumors; or at least 1 non-measurable lesion that is evaluable by nuclear medicine, tumor markers, or other reliable measures.
• Eastern Cooperative Oncology Group (ECOG) performance status ≤2; Absolute leukocyte count (≥4000/mm3), platelets ≥100,000/mm3, hemoglobin ≥9.0 g/dL; total bilirubin, aspartate amino transferase (AST) and alanine amino transferase (ALT) <1.5 the upper normal limit (UNL), creatinine ≤1.2 mg/dL or a calculated creatinine clearance of ≥60 mL/min.
• Life expectancy of more than three months,
• Written informed consent.

Exclusion criteria

• History of allergy to hydralazine or valproate.
• Past or present condition of rheumatic disease, central nervous system disease, heart failure from aortic stenosis and postural hypotension as diagnosed by a physician.
• Previous use of the experimental drugs (hydralazine and magnesium valproate)
• Pregnancy or breast-feeding.
• Uncontrolled systemic disease or infection.