Kathy Sieu

Kathy Sieu, RN, MS, ANP-c, AOCNP

joined Contra Costa Oncology in 2008. She carries a double certification as a board certified adult nurse practitioner and as an Advanced Oncology Certified Nurse Practitioner. Kathy graduated with honors from UCSF's Master's Nurse Practitioner program. She, also, holds bachelor's degrees in psychology/sociology and nursing. All degrees were conferred with honors and distinction. Her background includes many years of experience at Stanford University Hospital in primary care, trauma, intensive care, and cardiology. She has coordinated clinical medical research in interventional cardiology and radiology and continues to coordinate the practice's clinical trials. Kathy continues to coordinate clinical trials for Contra Costa Oncology, as well as gently guiding patients through bone marrow biopsies.


Since graduation Kathy has pursued additional studies in Cancer Genetic Risk Assessment through the Oncology Nurses Society and more recently became a member of City of Hope's community of practice upon completing their Intensive Course for Cancer Genetic Risk Assessment. Kathy has an active role in coordinating the American Cancer Society's San Ramon site of Relay for Life and is a volunteer with the California Disaster Relief Medical Volunteers. In her spare time she enjoys physical fitness, time with family, travel, reading and hiking.

Roxie Kneen

Roxie Kneen, MSN, NP-C, OCN

is a board certified Family Nurse Practitioner with a Master's Degree from Georgetown University and certification by ONS as an oncology certified nurse. Her extensive background includes many years as an oncology certified nurse with the Veterans Administration both in the Bay Area as well as in Miami, which prompted her to further her education to become a nurse practitioner. At Contra Costa Oncology, she works in tandem with our team of physicians, performing comprehensive health assessments and providing extensive review and interpretation of laboratory and imaging results. Roxie also offers education to patients regarding side effects and toxicities of chemotherapy and biologic treatments. In her free time she enjoys spending time with family and traveling, and she is an avid runner.