OBJECTIVES: Patient choice is increasingly recognized as a key factor in medical decision making process. This study aims to investigate preferences for adjuvant chemotherapy among women with early stage breast cancer in Taiwan. METHODS: Patient interviews were administered on women aged under 60 who sought treatment for stage I or II stage breast cancer at the outpatient department of two medical centers located in Taipei City, Taiwan. Five attributes of adjuvant chemotherapy was identified as the key determinants when making choices: frequency and administraton, length of treatment, cardiac toxicity, recurrence rate, and out-of-pocket payments.Survey questionnaire was designed based upon discrete choice experiments (DCEs). Preferences for 13 choice sets were elicited with opt-out option included. In total, 104 respondents were recruited by the end of 2011. Multinomial logit model was used to assess the relative value of product features and trade-off between attributes. Cluster analysis was used to Isolate women groups who place differing importance on different features. RESULTS: Descriptive statistics showed that most women were marred (77.2%) with mean age of 48.0. About half of the women were ful-time employed (52.6%) and 35.1 of them received years of education > 16 years (35.1%). Prelimanary regression analysis indicated that women significantly preferred shorter length of treatment, no cardiac toxicity, lower recurrence rate and lower out-of-pocket payment. CONCLUSIONS: The authorities concerned should incorporate patients’ preferences into the existing decision making process when making reimbursement decision.