Study never activated to enrollment.

This is a two-stage phase II study with a single arm design. It will be conducted in women with breast cancer with stages IIA to IIIC (defined by AJCC 2009 classification) of all histological subtypes. All patients will receive 16 doses of paclitaxel; three breast ultrasound tests and tumor pathologic response evaluation will be used to assess the response to treatment.

Each patient will be assigned one of the following groups: 1) complete response, 2) partial response, 3) stable disease, 4) progressive disease, 5) early death from malignant disease, 6) early death from toxicity, 7) early death because of other cause, or 8) unknown (not assessable, insufficient data). Patients with a good response to 8 doses of paclitaxel (complete response or partial response that are operable) will receive an additional 8 courses of paclitaxel chemotherapy before surgery and radiotherapy. The overall response for these patients will be assessed by ultrasonography after a total of 16 weeks of Taxol therapy. Patients with poor response (defined as stable disease or progressive disease or partial response inoperable) as best response after eight weekly courses of paclitaxel will receive 8 cycles of weekly PC. The overall response for these patients will also be assessed by ultrasonography after 8 courses of PC therapy. Patients with poor response to 8 courses of paclitaxel followed by 8 courses of PC based on ultrasound assessment will be regarded as failing to respond to treatment. These patients will receive 4 cycles of 3-weekly FEC and will be followed up. Patients in response groups 4-8 above will be considered as failing to respond to treatment.

All conclusions will be based on all eligible patients. The schema for the study is presented in Figures 4-1, 4-2 and 4-3. Patients with a global deterioration of health status requiring discontinuation of treatment without objective evidence of disease progression at that time will be classified as having "symptomatic deterioration". Every effort will be made to document the objective progression even after discontinuation of treatment. All Premenopausal patients will receive LHRH agonist for two years for contraception and fertility preservation. Hormone-receptor positive patients will receive hormonal therapy with tamoxifen or letrozole after surgery, radiotherapy and LHRH agonist according to the expression of hormone receptors ER and PgR (see glossary and section 10.3) and according to the state of primary menopause (see glossary) at the onset of the study. Patients with HER2-positive disease (see glossary and section 10.3) will receive 5 threeweekly courses of trastuzumab (Herceptin SC) with pertuzumab (Perjeta). After that pts will continue receiving trastuzumab to complete total of 18 doses within 1 year of treatment.

The study is designed to estimate the RR of breast cancer patients to weekly paclitaxel chemotherapy and to determine the RR to weekly PC combination chemotherapy in patients resistant to or with poor response (including early progression) while on weekly single agent paclitaxel.

Inclusion Criteria:

1. Women ages of 18 to 70 years old.

2. Biopsy-accessible breast tumor of significant size for core needle biopsy (≥ 2cm).

3. Patients with histologically confirmed carcinoma of the female breast with any or unknown HRs/HER2 status

4. Clinical stages IIA -IIIC. (AJCC 2009) (Appendix A)

5. Chemotherapy-naïve patients (for this malignancy)

6. Performance status: ECOG performance status 0-3 (Appendix B)

7. Non-pregnant and not nursing. Women of childbearing potential must take the pregnancy test and must commit to receive LHRH agonist Zoladex (goserelin) for two years starting from the commencement of the study medications.

8. Required Initial Laboratory Data. Adequate hematologic, renal and hepatic function, as defined by each of the following:

   1. Granulocyte ≥ 1,500/μL
   2. Platelet count ≥ 100,000/μL
   3. Absolute neutrophil count (ANC) ≥ l500/μL
   4. Hemoglobin³10g/dL
   5. Bilirubin ≤ 1.5 x upper limit of normal
   6. SGOT and SGPT < 2.5 x upper limit of normal for patients without liver metastases
   7. Creatinine within institutional normal limits or glomerular filtration rate ≥ 30 mL/min/1.73 m2 by CKD EPI equation (see http://mdrd.com/ for calculator)

Exclusion Criteria:

1. Pregnant or lactating women. Women of childbearing potential not using a reliable and appropriate contraceptive method. Postmenopausal women must have been amenorrheic for at least 12 months to be considered of non-childbearing potential.

   Patients will agree to continue the use of acceptable form of contraception for 30 days from the date of last drug administration.

2. Patients with brain metastasis.

3. Serious, uncontrolled, concurrent infection(s).

4. Patients who have received more than 4 weeks of tamoxifen therapy for this malignancy. Patient who have received tamoxifen or raloxifene for purposes of chemoprevention (e.g. Breast Cancer Prevention Trial or for other past indications (including previous breast cancer) are eligible. Tamoxifen or raloxifene therapy will be discontinued at least one month before the patient is enrolled on this study.

5. Treatment for other carcinomas within the last 5 years, except non-melanoma skin cancer and treated cervical carcinoma in-situ (CCIS).

6. Participation in any investigational drug study within 4 weeks preceding the start of study treatment.

7. Other serious uncontrolled medical conditions that the investigator feels might compromise study participation including but not limited to chronic or active infection, HIV-positive patient, uncontrolled hypertension, symptomatic congestive heart failure, unstable angina pectoris, uncontrolled Diabetes mellitus, or psychiatric illness/social situations that would limit compliance with study requirements.

8. Unwillingness to participate or inability to comply with the protocol for the duration of the study.