Inclusion Criteria:

- Histologically confirmed DCIS by breast core biopsy with a corresponding lesion on
breast MRI of at least 1-cm3 in volume.

- Patients may have undergone treatment with prior chemotherapy if this was greater
than 12 months prior to current diagnosis.

- Age >18 years.

- ECOG performance status <2 (Karnofsky >60%)

- Life expectancy of greater than 12 months.

- Normal organ and marrow function as defined below:

- leukocytes >3,000/mcL

- absolute neutrophil count >1,500/mcL

- platelets >100,000/mcL

- total bilirubin within normal institutional limits

- AST(SGOT) & ALT(SGPT)within normal institutional limits

- creatinine <1.5 times institutional upper limit of normal or creatinine clearance >60
mL/min/1.73 m2

- Ability to understand and the willingness to sign a written informed consent
document.

Exclusion Criteria:

- Pregnancy

- Patients who have undergone prior excisional biopsy for DCIS.

- Patients who are unable to undergo MRI due to claustrophobia or other reason.

- Patients with ipsilateral treatment for DCIS or breast cancer within 12 months prior
to entering this study.

- Patients receiving any other chemotherapy or investigational agents.

- History of allergic reactions attributed to compounds of similar chemical or biologic
composition to green tea extracts or sensitivity to green tea.

- Uncontrolled concurrent illness including, but not limited to: ongoing or active
infection, symptomatic congestive heart failure, unstable angina pectoris, cardiac
arrhythmia, or psychiatric illness/social situations that would limit compliance with
study requirements.