Kathleen Fitterer, RN, MS, GNP-c, AOCNP and Kathy Sieu, RN, MS, ANP-c work side by side with our physicians to provide clinical expertise to patients. They perform comprehensive health assessments, and provide supervision and interpretation of diagnostic tests. Dedicated to patient education, they also consult with patients regarding chemotherapy toxicity and comfort measures.

Kathleen Fitterer, RN, MS, GNP-c, AOCNP is a board certified Geriatric Nurse Practitioner with additional certification as an Advanced Oncology Certified Nurse Practitioner. Kathleen graduated with honors from San Francisco State University with her undergraduate degree as a bachelor's prepared Registered Nurse (RN). She worked for 12 years as an RN on the Oncology floor at John Muir Medical Center, where she had additional specialization as a chemotherapy and transplant certified nurse, apheresis nurse, charge nurse and preceptor for nursing students and new nursing graduates. During this time she taught breast self examination for Hadassah, co-facilitated the American Cancer Society (ACS) sponsored "I Can Cope" support group and volunteered with ACS's "Look Good Feel Better". Kathleen completed her master's level preparation as a Nurse Practitioner and graduated in 2001 with honors and distinction from the University of California, San Francisco. Since graduation Kathleen has pursued additional studies in Cancer Risk Assessment, coordination of the practice's clinical trials and precepting Nurse Practitioner students. She enjoys volunteering in the community with the Wellness Community, mentoring teens and at her children's school.

Kathy Sieu, RN, MS, ANP-c joined Contra Costa Oncology in 2008. She is a nationally certified adult nurse practitioner who graduated from UC San Francisco's Master's program in nursing. 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 both interventional cardiology and interventional radiology. In her spare time she volunteers as a health educator and as health care provider with the breast cancer walk. She enjoys spending time with her family, music, and outdoor activities such as running, cycling, hiking, skiing, and swimming.