Docetaxel Followed by CEF (Cyclophosphamide, Epirubicin and 5-Fluorouracil) Compared to Docetaxel and Capecitabine Followed by CEX (Cyclophosphamide, Epirubicin and Capecitabine) as Adjuvant Treatment for Breast Cancer

Inclusion Criteria:

To be eligible for inclusion in the study, each patient must fulfill each of the criteria below.

* Have provided written informed consent prior to study-specific screening procedures, with the understanding that the patient has the right to withdraw from the study at any time, without prejudice.
* Be female and 18 years of age or older.
* Have histologically confirmed invasive breast cancer.
* High risk of breast cancer recurrence (\> 25% within the first 5 years without adjuvant therapy, \> 35% within the first 10 years) with one of the following:

  * Regional node positive disease (pN+; tumor cells or tumor cell clusters \< 0.2 mm in diameter are not counted as metastases);
  * Pathological N0 and PgR- and tumor size \> 20 mm.

Exclusion Criteria:

Patients who fulfill any of the following criteria will be excluded:

* \> 65 years of age.
* "Special type" histology (mucinous, papillary, medullary, or tubular breast cancer), when pN0.
* ER, PgR and HER-2 status (via in situ hybridization or immunohistochemistry) not determined.
* Presence of distant metastases.
* Previous chemotherapy in the neoadjuvant setting.
* Non-ambulatory or WHO performance status \> 1.
* Pregnant or lactating women. Women of childbearing potential (menstruating within 6 months of study entry or with no hysterectomy and age \< 55) with either a positive or no pregnancy test at baseline.
* Women of childbearing potential unless using a reliable and appropriate contraceptive method. (Post-menopausal women must have been amenorrheic for at least 6 months to be considered of non-childbearing potential).
* More than 12 weeks between breast surgery and date of randomization.
* Organ allografts with immunosuppressive therapy required.
* Major surgery (except breast surgery) within 4 weeks prior to study treatment start, or lack of complete recovery from the effects of major surgery.
* Participation in any investigational drug study within 4 weeks preceding treatment start.
* Patients with a history of uncontrolled seizures, central nervous system disorders or psychiatric disability judged by the investigator to be clinically significant precluding informed consent or interfering with compliance for oral drug intake.
* History of another malignancy within the last five years except cured basal cell carcinoma of skin or carcinoma in situ of the uterine cervix.
* Clinically significant (i.e. active) cardiac disease (e.g. congestive heart failure, symptomatic coronary artery disease and cardiac arrhythmia not well controlled with medication) or myocardial infarction within the last 12 months.
* Abnormal laboratory values:

  * Hemoglobin \< 10.0 g/dL, neutrophils \< 1.5 x 10\^9/L, platelet count \< 120 x 10\^9/L;
  * Serum creatinine \> 1.5 x Upper Limit of Normal (ULN);
  * Creatinine clearance (calculated per Cockroft and Gault) \< 50 mL/min;
  * Serum bilirubin \> ULN;
  * ALAT \> 1.5 x ULN;
  * Alkaline phosphatase \> 2.5 x ULN.
* Serious uncontrolled intercurrent infections or other serious uncontrolled concomitant disease.
* Lack of physical integrity of the upper gastrointestinal tract or those who have clinically significant malabsorption syndrome.
* Inability to swallow tablets.
* Life expectancy of less than 3 months.
* Unwilling or unable to comply with the protocol for the duration of the study.
* Requirement for concurrent use of the antiviral agent sorivudine or chemically related analogues, such as brivudine.