• Cell morphology and protein expression of breast epithelial cells in duct lavage samples as a marker of tamoxifen effect [ Designated as safety issue: No ]
  
• Methylation status of genes previously identified to be related to neoplastic progression of cells in ductal lavage samples [ Designated as safety issue: No ]
  
• Protein profile of nipple aspiration fluid before and after study treatment [ Designated as safety issue: No ]
  

OBJECTIVES:

• Evaluate cell morphology and protein expression of breast epithelial cells in ductal lavage samples as a marker of tamoxifen effect from women with breast cancer or from women at high risk for developing breast cancer.
• Evaluate methylation status of genes previously identified to be related to neoplastic progression of cells in ductal lavage samples from these participants.
• Evaluate the protein profile of nipple aspiration fluid from these participants before and after treatment with tamoxifen.

OUTLINE: This is a multicenter study.

Participants who are eligible for tamoxifen chemoprevention therapy undergo ductal lavage. Participants are informed of cytological findings and choose to receive oral tamoxifen once daily for 5 years vs observation only. All participants undergo repeat ductal lavage at 6 months. Participants with atypical cytology undergo a third ductal lavage at 12 months.

Mammographic density is measured at study entry and at 12 months.

Ductal cells are analyzed for methylation status of candidate genes.

Participants are followed as clinically indicated.

PROJECTED ACCRUAL: A total of 200 participants will be accrued for this study.

DISEASE CHARACTERISTICS:

• Meets 1 of the following criteria:

  • Diagnosis of small invasive breast cancer
  • Diagnosis of ductal or lobular carcinoma in situ of the breast
  • At high risk for breast cancer (5-year Gail model risk of > 1.6%)
• Eligible for tamoxifen therapy
• No plans for adjuvant chemotherapy
• Prior unilateral early breast cancer allowed* NOTE: *Only the unaffected breast will be examined during this study

• Hormone-receptor status:

  • Estrogen receptor-positive (in patients with small invasive breast cancer)

PATIENT CHARACTERISTICS:

Age

• 18 to 64

Sex

• Female

Menopausal Status

• Premenopausal or postmenopausal

Performance status

• Not specified

Life expectancy

• Not specified

Hematopoietic

• Not specified

Hepatic

• Not specified

Renal

• Not specified

Cardiovascular

• No prior venous thromboembolism

Other

• At least 12 months post-partum
• Not pregnant
• Not nursing within the past 12 months
• No known allergy to lidocaine, prilocaine, or bupivacaine
• No uterine hyperplasia or polyps
• No other contraindication to tamoxifen

PRIOR CONCURRENT THERAPY:

Biologic therapy

• Not specified

Chemotherapy

• See Disease Characteristics
• More than 6 months since prior chemotherapy

Endocrine therapy

• Concurrent hormone-replacement therapy allowed
• Prior tamoxifen or raloxifene allowed provided treatment duration was no more than 6 months
• At least 1 year since prior raloxifene

Radiotherapy

• Not specified

Surgery

• Not specified