A Randomized Study Comparing Placebo and ASP3652 in the Treatment of Women With Bladder Pain Syndrome / Interstitial Cystitis (BPS/IC)

Inclusion Criteria: * Has previously been diagnosed with BPS/IC; i.e., pelvic pain, pressure or discomfort perceived to be related to the urinary bladder accompanied by at least one other urinary symptom such as persistent urge to void or frequency, for at least 3 months prior to screening in absence of urinary infection or other obvious pathology or identifiable causes * Has at enrolment a score of 4 or greater on the 11-point (0-10) NRS for average pain over the previous week, which is item 4 of the F-GUPI * Has a mean pain score of 4.0 or greater on the 11-point (0-10) NRS for daily assessed pain (item 4 of F-GUPI-24H) over the last 7 days prior to randomization * Is willing to comply with study requirements such as completing the questionnaires and diaries and attend all study visits and practicing birth control Exclusion Criteria: * Undergone a cystoscopy with hydrodistension or undergone Botox injections in the bladder within 6 months prior to screening * Use of pentosan polysulphate sodium within 4 weeks prior to screening * Any intravesicular pharmacological treatment or other interventions for BPS/IC or bladder, urethral, ureteral, pelvic or peri-pelvic invasive procedure within 3 months prior to screening * Cystitis or documented symptomatic bacterial cystitis in the last 3 months prior to screening * Lower urinary tract malignancy, such as positive (micro) hematuria in urine sediment * Neurologic disease or defect affecting bladder function or symptomatic urethral diverticulum or any post-partum or surgery related genital tract conditions, symptomatic bladder or ureteral calculi or Post Void Residual volume greater than 150 mL * Clinically significant abnormalities observed during cystoscopy or on transabdominal ultrasound * Currently active or treated sexual transmittable diseases * Substance abuse or any use of delta-9-tertrahydrocannabinol (THC) as assessed by a positive urine test for THC at screening * Any clinically relevant concomitant disease (past or present) which would, in the opinion of the investigator, put the subject at risk or mask measures of efficacy * Symptoms of depression, defined as a Center for Epidemiological Studies Depression Scale score of 27 or more * Use of steroids, immunomodulators, cytochrome P4502C8 inhibitors, cannabis / THC based medication, opioid analgesics or antiviral / antibacterial / antifungal agents during the last 4 weeks before the screening * Initiation, discontinuation, or variation in the dose of antidepressants, anticonvulsants, antimuscarinics, benzodiazepines, skeletal muscle relaxants, non-steroid anti-inflammatory drugs, non opioid analgesics, homeopathic medication and herbal therapies during the last 4 weeks before the screening. Subjects should continue these medications at that same stable dose throughout the study * Clinically relevant abnormal urine or blood safety laboratory values or active hepatic and/or biliary disease (AST or ALT should not be \>2 times the upper limit of normal, total bilirubin should not be \>1.5 times the upper limit of normal) * Participated in any clinical study or has been treated with any investigational drug or device within 84 days or the period stipulated by local regulations, whichever is longer, prior to the screening