Please assess the completion status of the following clinical trial:

Trial Title: White Button Mushroom Extract in Treating Patients With Recurrent Prostate Cancer After Local Therapy

Study Design Characteristics:
- Allocation: None
- Intervention Model: SINGLE_GROUP
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: NONE
- Phase: PHASE1
- Number of Arms: 1.0

Eligibility Criteria:
Inclusion Criteria:~* Patients must have a histologically or cytologically confirmed history of adenocarcinoma of the prostate Patients must have a PSA failure defined as PSA of \>= 0.2 ng/ml that has increased above nadir following prostatectomy If radiation or other local therapy was used as a primary therapy and no prostatectomy was performed patients must have PSA increase of 2.0 above post-therapy nadir; PSA value must be increasing based on two consecutive measurements each separated by at least 2 weeks with no clinical or radiographic evidence of metastatic disease; PSA values that meet the criteria for eligibility within 4 weeks of registration are acceptable to document eligibility for enrollment on this study; PSA level obtained after registration and prior to the first course will be used as the baseline PSA as per the schema but will not determine eligibility for participation~* Patients must have had at least three PSA measurements over a minimum of three months available prior to enrollment to this study~* Patients may have received any number of local therapies (radical prostatectomy, external beam radiation therapy, radioactive seed implantation, cryotherapy)~* Bone scan and computed tomography (CT) scan of the chest, abdomen and pelvis negative for metastatic disease within 2 months prior to registration~* Patients must have a performance status of 0, 1, or 2~* All patients will have malignancy confirmed by review of their biopsy specimens by the Division of Pathology, City of Hope National Medical Center; if no pathological specimen is available for review, the patient may still be included if the patient has clearly documented prostate cancer per pathology report and a specimen request is documented as having been made for tissue from the outside facility but a specimen was unable to be obtained~* Serum creatinine =\< 2.5 mg/dL~* Baseline liver function tests including bilirubin =\< 1.5 x the institutional upper limit of normal and serum glutamic oxaloacetic transaminase (SGOT) and serum glutamic pyruvic transaminase (SGPT) =\< 2.5 x the institutional upper limit of normal~* White blood cells (WBC) \>= 2000~* Platelets \>= 50,000~Exclusion Criteria:~* Patients with evidence of metastatic disease~* PSA progression not verified by sequential rising PSA as discussed in the eligibility section~* Patients who have received prior cytotoxic chemotherapy or androgen ablative therapy for recurrent disease~* Patients currently receiving biological response modifiers, or corticosteroids~* Patients are permitted to have received up to 24 months of neoadjuvant or adjuvant hormone ablation in conjunction with their primary definitive therapy; androgen deprivation must have been completed at least 6 months prior to registration and testosterone level must be \> 50; no complementary or alternative therapy (e.g. St. John's Wort, PC-SPES, or other herbal remedies taken for the purpose of treating prostate cancer) may be given during protocol treatment; patients are allowed to have received neoadjuvant and/or adjuvant chemotherapy that was completed at least 6 months prior to registration to the protocol~* Uncontrolled intercurrent illness including, but not limited to, ongoing active infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac arrhythmia, or psychiatric illness/ social situations that would limit compliance with study requirements~* Patients with known allergy to mushrooms

- Gender: MALE
- Minimum Age: None
- Maximum Age: None
- Healthy Volunteers: f

Study Arms:
- Treatment (enzyme inhibitor therapy) (Type: EXPERIMENTAL): Patients receive white button mushroom extract PO twice daily on days 1-28. Treatment repeats every 4 weeks in the absence of disease progression or unacceptable toxicity.

Based on this trial design, predict the completion outcome and termination type (if applicable).

Answer: outcome: complete