Hui Yee Yeo,1,2 Jacqueline Hui Yi Wong,3 Suz Jack Chan,1 Anna Tiatia Fa’atoese Latu,1 Catherine H Han,4,5 Mudassir Anwar,1 Carlo A Marra1 1School of Pharmacy, University of Otago, Dunedin, New Zealand; 2Clinical Research Center, Hospital Seberang Jaya, Seberang Jaya, Penang, Malaysia; 3Pharmacy Department, Hospital Kuala Lumpur, Kuala Lumpur, Malaysia; 4Auckland Oncology, Auckland, New Zealand; 5Faculty of Medical and Health Sciences, University of Auckland, Auckland, New ZealandCorrespondence: Carlo A Marra, School of Pharmacy, University of Otago, PO Box 56, Dunedin, 9054, New Zealand, Tel +64-34797275, Fax +64-34797034, Email carlo.marra@otago.ac.nzPurpose: Despite the importance of acknowledging patient preferences in treatment decision-making, little is known about the treatment preferences and the factors underlying those preferences of breast cancer patients. This study aims explore patient experience and perspective regarding treatment preferences and identify the important determinants that shape these preferences in the context of New Zealand.Patients and Methods: Semi-structured online interviews comprised of six focus group discussions and five individual interviews were performed with 26 breast cancer patients. The interviews were recorded, transcribed, and analyzed using the reflexive thematic analysis approach.Results: Four main themes were derived: (1) positive treatment outcomes; (2) the negative impact of treatment-related side effects on quality of life; (3) treatment accessibility, availability, and timeliness; (4) cost of treatment. Patients revealed a strong preference towards treatments that yield longer survival, achieve remission, and prevent cancer recurrence. Additionally, patients favored treatments with minimal side effects that had minimal impact on their quality of life. There was a notable preference for treatments that were easily accessible and available in a timely manner. However, patients faced challenging decisions in balancing the costs of treatments with their benefits, leading to a consistent preference for treatments supported by government funding or medical insurance to alleviate financial burdens.Conclusion: Our study reveals that breast cancer patients in New Zealand have different perceptions and preferences regarding cancer treatment. Patients frequently find themselves making trade-offs among various attributes of a treatment, aligning these decisions with their personal values and beliefs. By considering these preferences and trade-offs in future studies that measure patient preferences, healthcare professionals can enhance their support for patients in making informed choices that align with their values and priorities. Additionally, healthcare policymakers can develop patient-centered policies that cater to the unique needs and preferences of breast cancer patients.Plain Language Summary: Breast cancer is a significant health concern in New Zealand, affecting both the well-being of patients and their families. Despite advancements in treatment, patient preferences regarding treatment risks and benefits are often neglected. This study aims to bridge this knowledge gap by qualitatively exploring the unique experiences and preferences of breast cancer patients in New Zealand, shedding light on the factors influencing their treatment decisions. The study involved a series of interviews with a group of 26 women living with breast cancer. The interview revealed four main themes that shape patients’ preferences for breast cancer treatment: 1. Positive outcomes: Patients revealed a strong preference towards treatments that yield longer survival, achieve remission, and prevent cancer recurrence. 2. Quality of life: Treatment-related side effects negatively impacted patients’ quality of life, affecting them physically, mentally, emotionally, spiritually, and psychosocially. Patients preferred a treatment that entailed few side effects with minimal impact on their quality of life. 3. Treatment accessibility and timeliness: Patients expressed concerns about administrative complexities, long distances to healthcare facilities, timely treatment, and restricted access to treatment options in the country. There was a notable preference for treatments that were easily accessible and available in a timely manner. 4. Cost of treatment: Balancing the cost of treatments with their benefits posed challenging decisions for patients, who consistently voiced a preference for treatments supported by government funding or medical insurance.The study highlights diverse perspectives and preferences among breast cancer patients in New Zealand about treatment preference. Patients frequently find themselves making trade-offs concerning various attributes of a treatment that align with their individual values and beliefs. Integrating these preferences and trade-offs into future studies and healthcare policies can help healthcare professionals and policymakers better support patients in making informed choices aligned with their values, fostering a more patient-centered healthcare system.Keywords: qualitative research, patient preference, breast cancer, reflexive thematic analysis, treatment preference, treatment decision-making