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(707) 551-3300

Our Physicians & Staff

Care Team

Your Care Team is made up of a large number of highly trained and experienced clinical professionals including our Physicians, Physician Assistant, Registered Nurses, Clinical Medical Assistants, Phlebotomists, as well as skilled Administrative and Financial staff.
Each one has a valuable role in your care and are ready to serve your needs. Please do not hesitate to contact us with questions.
medical doctor

Chainarong Limvarapuss, M.D.

Dr. Limvarapuss, founder of Solano Hematology Oncology (Vallejo) and Cancer Treatment Center of Vacaville, is Board Certified in Medical Oncology, Hematology, and Internal Medicine. He attended medical school at Mahidol University in Bangkok, Thailand, where he graduated with honors. After his internship at St. Luke's Hospital in New York, New York, he completed his residency at Henry Ford Hospital in Detroit, Michigan. His fellowship in Hematology/Oncology was completed at the Karmanos Cancer Institute, Wayne State University, Detroit, Michigan, which is an NCI-designated comprehensive cancer center.
Among his professional interests are the treatment of breast, colon and lung cancers, solid tumors and hematologic malignancies and non-malignant blood disorders. He is the President of Solano Hematology Oncology and the Vice Chief of Medicine at Sutter Solano Medical Center. He is also actively involved in clinical research to continue the advancement of Medical Oncology within his practice and as the Clinical Trials Medical Director for the Sutter Solano Cancer Center. He also has varying affiliations with other Bay Area hospitals such as NorthBay Medical Center and VacaValley Hospital.
His personal interests include gardening, cooking, and pursuing continued physical fitness. He acknowledges the relationship between spiritual and physical well-being and their role in healing and continued good health.
Dr. Limvarapuss was voted the Honorary Chair of the American Cancer Society, Solano County, in 2011. He continues to be a major supporter of their efforts to fight cancer and support survivors.
Dr. Limvarapuss is fluent in English and Thai and speaks some Japanese and Chinese.
Dr. chaiyarat

Walailuk Chaiyarat, M.D.

Dr. Chaiyarat is Board Certified in Medical Oncology, Hematology, and Internal Medicine. She graduated Magna Cum Laude from Mahidol University in Bangkok, Thailand, and continued on to do her internship at St. Luke's Hospital in New York, New York. She then completed her fellowship in Hematology/Oncology at Baylor College of Medicine, Houston, Texas, and has practiced in Thailand before returning to the United States to settle in the Bay Area.
Among her professional interests are the treatment and study of breast and Lung cancers. She is involved in Clinical Research at Solano Hematology Oncology (Vallejo), Cancer Treatment Center of Vacaville and at the Sutter Solano Cancer Center, believing them to be a very important avenue for finding newer, more effective, and safer treatments for patients.
Her personal interests include spending time outdoors hiking, exploring the variety of the Bay Area, and building long-lasting personal and professional relationships within the local community.
Dr. Chaiyarat is fluent in English and Thai.

Ann Wexler, M.D.

Dr. Wexler is Board Certified in Medical Oncology and Hematology. First achieving a Bachelor of Science in Psychology and a Master of Science in Biological Psychology, Dr. Wexler went on to complete her medical training at the University of Texas Health Science Center in San Antonio, Texas. She followed that with her Internal Medicine Residency in New York’s St. Vincent’s Hospital and her Hematology/Oncology Fellowship at their highly-acclaimed Comprehensive Cancer Center. 
Since then, she has gained a decade of experience treating patients in the San Francisco Bay Area within the John Muir Concord and Walnut Creek campuses and the Sutter Alta Bates Summit Medical Center, Oakland, before joining us to continue the fight against cancer in Solano County.
With interest in all types of cancer, she has a large group of patients who have followed her wherever she has gone. Her vibrant energy and amazing skills are a blessing to her patients and the community.
She will be primarily seeing patients in our Vallejo office inside the Sutter Solano Cancer Center and has privileges at local hospitals including Sutter Solano Medical Center and Alta Bates Summit Medical Center.
Dr. Wexler is fluent in English and Español.

Alyssa Stephens, PA-C

Alyssa Stephens, PA-C first earned a Bachelor of Science in Human Biology at University of California, San Diego in 2010. She continued on to earn her Master of Science in Physician Assistant Studies and Masters of Public Health at Touro University in 2017.
Bright and energetic, Alyssa assists Dr. Limvarapuss and the other physicians in all aspects of patient care. Her skill and compassion enable her to quickly assess patient needs. Available to provide care for the wide range of issue, Alyssa is an integral part of our Care Team.

Michele Knudson, R.N., Lead Clinical Nurse

With over 15 years experience as a nurse and 12 years as an oncology nurse for Solano Hematology Oncology, Michele leads our team of highly skilled nurses. She received her training at Solano Community College and has experience also in acute care and emergency response. Certified in Chemotherapy and Biotherapy, Michele is an active member of the local Oncology Nursing Society, Napa Valley chapter.
Michele works very hard to provide the best patient care possible. In her personal time, she enjoys a wide range of family activities and is a strong supporter of the San Francisco Giants.
With compassion and empathy, all of our skilled Registered Nurses are available to provide our wide range of chemotherapy, biotherapy, and immunotherapy IV treatments. They also assist the physicians with triage of urgent needs and add-on patient care, such as IV antibiotics and hydration.

Veronica Fazzare, R.N.

​Fred Manz, R.N.

Nicole Eseed, R.N.

Chanel Dunn, R.N.

Leanna Phonsa, R.N.

Sarah Mikesell, R.N.

Clinical Medical Assistants & Phlebotomists

Rounding out our Care Team, our Clinical Medical Assistants and Phlebotomists are available to meet your care needs. By aligning closely with several local schools, we have attained the best group of Clinical Medical Assistants and Phlebotomists available. With a high-degree of energy and compassion, you will encounter them throughout our office - from our Pharmacy to our Lab and the Clinic to the Infusion areas. They provide assistance to the physicians, nurses, and to you.

Your Support Team

Tina Beam, Vice President

Administrative Support & Financial Counselors

We hope this information has been helpful. We will strive at all times to provide the very best care possible.
If at any time you feel these standards are not being met, please ask to speak with one of the supervisors.
On behalf of our entire team, "Thank you”  for choosing Solano Hematology Oncology (Vallejo) and Cancer Treatment Center of Vacaville for your care, where your care and comfort are always our first priority.

Caring for You, Caring for Our Community

Call Us Today At (707) 551-3300