Vulvodynia is characterized by persistent vulvar pain, which often occurs upon touch or pressure. The cause of vulvodynia is unknown but is presumed to involve many factors. Some of these factors may include altered immune response, infections, altered vaginal acid-base balance, allergic reactions and psychosexual disorders. Women are generally treated with medications such as anti-histamines, anti-depressants and anti-inflammatories, or with physical therapy to minimize symptoms. Other therapies for vulvodynia include topical agents (lidocaine, or compounded medications such as baclofen, gabapentin and amitriptyline), oral medications (gabapentin, pregabalin, calcium citrate), complementary therapies (yoga, guided imagery, cognitive behavioral therapy) or a low-oxalate diet, but these are often ineffective. Surgery for vulvodynia may be helpful in the hard to manage cases, but is utilized as a last resort.

CC-10004 is a well-tolerated, selective PDE4 inhibitor with a demonstrated inhibitory effect on inflammatory mediators and is under development for the treatment of inflammatory and immune mediated conditions.

This is an open-label, one arm, phase II study at William Beaumont Hospital. Twenty female subjects aged 18 or older meeting criteria for diagnosis of vulvodynia or vulvar vestibulitis (vestibulodynia) will be treated with CC-10004 at 20mg orally twice a day for 12 weeks.The patient will be seen for a total of ten visits by the study coordinator.

Inclusion Criteria:

1. Participant must understand and voluntarily sign and date the appropriate Informed Consent document.

2. Female who is ≥ 18 years of age and <70 years of age.

3. Participant must be able to adhere to the study visit schedule and other protocol requirements.

4. Participant must have vulvodynia--vulvar pain at 2 or more sites tested of at least 3 or greater on a 0-10 Likert scale.

5. Subject -reported vulvar pain for at least 3 months prior to enrollment.

6. Participant who is currently taking narcotics for pelvic pain must be on a stable regimen for 3 months prior to enrollment in the study.

7. Females of childbearing potential (FCBP) must have a negative urine pregnancy test at screening/baseline (Visit 1). In addition, sexually active FCBP must agree to use TWO of the following adequate forms of contraception while on study medication: oral, injectable, or implantable hormonal contraceptives; tubal ligation; intrauterine device; barrier contraceptive with spermicide; or vasectomized partner. A FCBP must agree to have pregnancy tests every 28 days while on study medication.

8. Subject must meet the following laboratory criteria:

   • Hemoglobin > 9 g/dL
   • Hematocrit ≥ 27%
   • White blood cell (WBC) count ≥ 3000 /mL (≥ 3.0 X 109/L) and < 20,000/mL (< 20 X 109/L)
   • Neutrophils ≥ 1500 /mL (≥ 1.5 X 109/L)
   • Platelets ≥ 100,000 /mL (≥ 100 X 109/L)
   • Serum creatinine ≤ 1.5 mg/dL (≤ 132.6 μmol/L)
   • Total bilirubin £ 2.0 mg/dL
   • Aspartate transaminase (AST [serum glutamic oxaloacetic transaminase, SGOT]) and alanine transaminase (ALT [serum glutamate pyruvic transaminase, SGPT]) < 1.5x upper limit of normal (ULN)

Exclusion Criteria:

1. Pregnant or lactating females
2. History of any clinically significant cardiac, endocrinologic, pulmonary, neurologic, psychiatric, hepatic, renal, hematologic, immunologic conditions, or other major diseases
3. Any condition, including the presence of laboratory abnormalities, which places the subject at unacceptable risk if he/she were to participate in the study or confounds the ability to interpret data from the study
4. History of active Mycobacterium tuberculosis infection (any subspecies) within 3 years prior to the screening visit. Infections that occurred > 3 years prior to entry must have been effectively treated.
5. Positive TB skin test (Mantoux test)
6. History of incompletely treated latent Mycobacterium tuberculosis infection as indicated by a positive positive Purified Protein Derivative [PPD] skin test or in vitro test [T-SPOT®. TB, QuantiFERON Gold®] or chest x-ray.
7. Clinically significant abnormality on the chest x-ray (CXR) at screening.
8. Use of any investigational medication within 28 days prior to randomization or 5 half-lives if known (whichever is longer)
9. Any clinically significant abnormality on 12-lead ECG at screening
10. Positive human immunodeficiency virus (HIV), hepatitis B, or hepatitis C laboratory test result indicating active infection at screening.
11. History of malignancy within previous 5 years (except for treated basal-cell skin carcinoma(s) and/or fewer than 3 treated squamous-cell skin carcinomas)
12. History of a vestibulectomy

Small pilot study without placebo arm. Only 7 subjects completed treatment.