Oncology Support Staff

Sarah Buenviaje, O.N.P.

Sarah BuenviajeSarah received her B.S. in Nursing from University of Southern California in 1992 and earned her M.S.N. in the Oncology Nurse Practitioner program at UCLA Medical Center in 1996. She has been practicing as an Oncology Nurse Practitioner since 1996 with Diablo Valley Oncology / Hematology Medical Group located at the California Cancer and Research Institute in Pleasant Hill which specializes in comprehensive, cutting edge treatment of all forms of cancer and blood disorders. Sarah is a sub-investigator participating in research and clinical trials with Bay Area Cancer and Research Group at the California Cancer and Research Institute. She serves on the Professional Advisory Board for the Wellness Community in Walnut Creek.


Tinrin Chew, R.D., C.S.O.

Tinrin ChewTinrin Chew is a registered dietitian, who is Board Certified Specialist in Oncology Nutrition. She is recently certified in Adult Weight Management. Tinrin graduated from University of Hawaii and completed her internship at Detroit Medical Center in Michigan. Subsequently, she spent 8 years working as a clinical dietitian at Detroit Medical Center; during that time, she garnered her expertise in digestive issues, heart disease, diabetes and weight management.

Tinrin is an oncology dietitian with Diablo Valley Oncology / Hematology Medical Group. She also has a private practice providing nutrition consultation in Lafayette.

Tinrin is a regular speaker at the Wellness Community and Bay Area Tumor Institute, and is involved in many local cancer support groups and education programs. She has been co-leading “Navigating through Chemotherapy and Nutrition” at John Muir Medical Center. She contributed a nutrition chapter to “Chemotherapy Survival Guide” published last year and co-authored a chapter to “Nutrition Issues in Cancer Care” for health care professionals.


Gila Maria Fucanan, R.N., M.S., G.N.P.

Gila Fucanan, RN, MS, GNPGila received her Registered Nursing degree from University of California San Francisco in 2005 and earned her M.S.N. in the Gerontological Nurse Practitioner Program at UCSF in 2008. Gila is board certified by the American Nurses Credentialing Center (ANCC) and is a member of the Philippine Nurses Association of Northern California (PNANC).

In 2009, she joined Diablo Valley Oncology at the Pleasant Hill office location where she practices in the Radiation Oncology Department.

She is fluent in English and Tagalog.


Mai Gillingham, P.A.

Mai GillinghamMai has worked in the medical field since 2004. She received her Nursing Assistant Degree from Northcentral Technical College in 2005, her Bachelors of Science in Physician Assistant Studies from the University of Wisconsin-Madison Physician Assistant Program in 2008 and her Masters of Physician Assistant Studies from The University of Nebraska Medical Center in 2010. Mai developed extensive experience in bone marrow procedures while working as a Physician Assistant in the Bone Marrow Transplant Department at Froedtert Hospital and Medical College of Wisconsin. In 2011, she joined Diablo Valley Oncology/Hematology Medical Group. She is a member of the American Academy of Physician Assistants and she is licensed and regulated by the Physician’s Assistant Committee of California. Mai provides in-depth educational counseling to her patients and encourages them develop a thorough understanding of their individual health issues.


Michelle Rooney, N.P.

michelle rooneyMichelle received her B.A. in Psychology from Gonzaga University in Spokane, Washington in 1998 and her M.S.N. in the Family Nurse Practitioner program from Samuel Merritt College in Oakland, California in 2002. She is an Oncology Certified Nurse and has been practicing as a Nurse Practitioner since 2004 with DVO. Michelle is a sub-investigator participating in research and clinical trials with Bay Area Cancer and Research Group at the California Cancer and Research Institute. Michelle serves on the Professional Advisory Board for the Wellness Community in Walnut Creek and serves on the Board of the local melanoma foundation, SCARF, as a medical advisor. Michelle takes great interest in the role exercise and nutrition play in the prevention and management of cancer and has published a review article on the subject in the Clinical Journal of Oncology Nursing.


Michelle Taymuree, PharmD, MBA

Michelle TaymureeMichelle received an undergraduate degree from the University of California at Berkeley, and a Doctorate of Pharmacy from the University of Maryland, Baltimore in 2008. She also earned a Masters of Business Administration from the University of Baltimore, Merrick School of Business in 2008.

Previously a Pharmacy Manager for a large retail chain, in 2011 she became the Director of Pharmacy for Diablo Valley Oncology and Hematology.

Michelle is a member of the American Society of Health-System Pharmacists (ASHP), the California Society of Health-System Pharmacists (CSHP), and the California Pharmacists Association (CPhA). Michelle provides educational talks in the community, volunteers with East Bay College Fund and is a mentor at the Berkeley YMCA.