Please assess the completion status of the following clinical trial:

Trial Title: Isoflavones in Treating Women Who Have Breast Cancer and Are Planning to Undergo Mastectomy or Lumpectomy

Study Design Characteristics:
- Allocation: RANDOMIZED
- Intervention Model: PARALLEL
- Observational Model: None
- Primary Purpose: TREATMENT
- Time Perspective: None
- Masking: DOUBLE
- Phase: None
- Number of Arms: 2.0

Eligibility Criteria:
DISEASE CHARACTERISTICS:~* Undergoing breast biopsy for any stage breast cancer~  * No excisional biopsy~ * At least one core biopsy block must contain carcinoma~* Definitive surgery (mastectomy or lumpectomy) planned for 2-4 weeks after registration to this study~* Hormone receptor status:~  * Not specified~PATIENT CHARACTERISTICS:~Age:~* 18 and over~Sex:~* Female~Menopausal status:~* Premenopausal~Performance status:~* Not specified~Life expectancy:~* Not specified~Hematopoietic:~* Not specified~Hepatic:~* No known prior hepatic disease~Renal:~* No known prior renal disease~Other:~* Not pregnant or nursing~* Fertile patients must use effective non-hormonal contraception~* No other prior malignancy except nonmelanoma skin cancer~* No known prior thyroid disease~* No adherence to vegan diet or other special dietary requirements that would preclude study participation~* No allergy to study agent~* No obesity (body mass index greater than 32)~PRIOR CONCURRENT THERAPY:~Biologic therapy:~* Not specified~Chemotherapy:~* Not specified~Endocrine therapy:~* No concurrent birth control pills or other hormonal therapy~* No concurrent thyroid hormone replacement medications~Radiotherapy:~* Not specified~Surgery:~* See Disease Characteristics~Other:~* More than 30 days since prior antibiotics~* More than 4 weeks since prior soy products~* No routine consumption of greater than 40 mg of soy/day~* No other concurrent nutritional supplements, including modular supplements of other isoflavones

- Gender: FEMALE
- Minimum Age: 18 Years
- Maximum Age: None
- Healthy Volunteers: f

Study Arms:
- Soy protein isolate (Type: EXPERIMENTAL): Administration Prior to Mastectomy or Lumpectomy.~Patients receive oral soy protein isolate twice daily and oral multivitamins once daily.~Treatment continues for 2-4 weeks depending on time from study entry to planned surgical procedure.
- Placebo (Type: PLACEBO_COMPARATOR): Administration Prior to Mastectomy or Lumpectomy.~Patients receive oral placebo twice daily and oral multivitamins once daily.~Treatment continues for 2-4 weeks depending on time from study entry to planned surgical procedure.

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