Phase 1 Study With OAB Assessing the Safety and Activity of hMaxi-K Gene Transfer

Inclusion Criteria: 1. Healthy women of ≥18 years of age and non-childbearing potential 2. Symptoms of overactive bladder for ≥6 months including at least one of the following: 1. Frequent micturition ≥8 times per 24 hours 2. Urinary urgency or nocturia 3. Urge urinary incontinence five or more incontinence episodes per week 3. Detrusor overactivity with ≥1 uncontrolled phasic contraction(s) of the detrusor of at least 5 centimeters/H20 pressure documented on cystometry at Screening Visit 1A 4. Residual urine volume of ≤200 milliliters (ml) 5. Non-response or poor tolerance to previous treatment for symptoms of OAB/urinary incontinence and do not wish to continue these treatments 6. Have screening laboratory values and electrocardiogram that are within the normal range 7. Able to understand study requirements (i.e., literate in English), give written informed consent, and comply with all study procedures and requirements. Exclusion Criteria: * A woman with a positive serum (HCG) pregnancy test or who is lactating * History of three or more culture-documented recurrent urinary tract infections per year * Current history or previous diagnosis of painful bladder syndrome (interstitial cystitis) with pain in the region of the pelvis, perineum, or lower abdomen relieved by voiding * Current history of neurological bladder dysfunction * A life expectancy of less than 12 months * Current history of Grade 2 or greater cystocele * An indwelling urethral catheter or need for clean intermittent self-catheterization * Recent heart attack * Uncontrolled diabetes * Latex allergy * Stress urinary incontinence as determined by observation of the participant coughing while standing with a full bladder and/or response of 2 or 3 on the following Stress Urinary Incontinence question: Do you experience leakage when laughing, coughing, lifting heavy objects or other types of discreet, moderately intense activities? 0=NONE: No leakage. 1=MILD: Minimal leakage on rare occasions during these types of activities; easily tolerated; do not use pads for this. 2=MODERATE: Enough leakage that it requires occasional use of pads and may interfere with usual activity and tasks. 3=SEVERE: Extreme leakage and discomfort that stops all activity and tasks and requires the use of pads on all occasions