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Availability last updated 04/01/2026
BIOGRAPHY
Dr. Nagaiah received his medical degree from MGR Medical University in India and has been in practice for more than 20 years. His residency and internship were completed at Mercy Catholic Medical Center in Pennsylvania, and he completed a fellowship at West Virginia University. He earned a Masters in Clinical Research from the MGH Institute of Health Professions in Boston. Dr. Nagaiah has expertise in treating lymphoma, lung cancer, and breast cancer, among other conditions.
PHILOSOPHY
I believe that being an oncologist is a privilege that is not to be taken lightly. I strive to provide evidence-based care that is appropriate to my patients’ particular problem, recognizing and respecting individual patient’s wishes. I take a multidisciplinary approach to care, including alternative therapies that have been shown to be effective.
RESEARCH PUBLICATIONS
LinkedIn:
Dr. Govardhanan Nagaiah, MD
Internist
14155 N. 83rd Ave.
#127
Peoria, AZ 85381
Craig Hullett, MD, PhD, is a board-certified radiation oncologist with extensive experience in the treatment of a wide range of malignancies. He began his academic career in Communication, earning a Bachelor of Arts from Augustana College in Rock Island, Illinois, followed by a Master of Arts from Wake Forest University and a Doctor of Philosophy from Michigan State University. He later served as a tenured Associate Professor of Communication at the University of Arizona.
Inspired by his volunteer work at a local hospice, Dr. Hullett transitioned to medicine and earned his Doctor of Medicine degree from the University of Arizona. During medical school, he was inducted into the Gold Humanism Honor Society and Alpha Omega Alpha, recognizing his commitment to compassionate, patient-centered care and academic excellence. He completed his internship and residency training in Radiation Oncology at the University of Wisconsin.
Dr. Hullett has been practicing in Arizona since 2022 and is pleased to have returned to the state with his family. Outside of his clinical practice, he enjoys spending time with his family, exercising, and traveling.
Languages spoken: English
Dr. Craig Hullett, MD
Radiologist
14155 N. 83rd Ave.
#127
Peoria, AZ 85381
Dr. Daniel Richard Reed specializes in radiation oncology, with a focus on breast and prostate cancers.
Dr. Reed co-founded Arizona Center for Cancer Care in 2008 with Drs. Devinder Singh, Christopher Biggs and Terry Lee. He received his Bachelor of Science in Chemistry and Biology from Western Kentucky University. He attended medical school at West Virginia School of Osteopathic Medicine, completed his internship at Doctors Hospital Ohio University and his residency at the University of Washington Medical Center, where he would eventually serve as Chief Resident and in 2002 earned the National Research Award in radiation oncology for his work in breast cancer treatment. He also served as the Seattle Prostate Institute/American Brachytherapy Society Prostate fellowship coordinator for several years.
In 2007, he authored the National Treatment Guidelines of the American College of Radiology for Prostate Cancer Radiation Therapy and the book chapter on Skull-based tumors in The Textbook of Radiation Oncology (2nd edition). He has also served as a scientific reviewer for the International Journal of Radiation Oncology and national representative of the American Brachytherapy Society.
Dr. Reed is certified by the American Board of Radiology and is a Diplomat of the American Society of Therapeutic Radiation Oncology. He is a current or past member of the American Brachytherapy Society, American Radium Society, American Radiology Resident Association, American Society of Clinical Oncology, American Medical Association and American Osteopathic Association, among others.
Dr. Reed is a multi-year “Top Doc” honoree by Phoenix Magazine and has over 70 combined 5-star reviews from happy patients.
Patient Reviews:
Dr. Daniel Reed, DO
Radiologist
14155 N. 83rd Ave.
#127
Peoria, AZ 85381
Dr. Christopher Biggs specializes in radiation oncology and is an expert in radiosurgery and gynecological oncology.
Dr. Biggs co-founded Arizona Center for Cancer Care in 2008 with Drs. Devinder Singh, Daniel Reed and Terry Lee. He attended the University of Arizona, where he received his Bachelor of Science degree in Molecular and Cellular biology. His interest in cancer research took him to the University of Southern California, under the Borchard Cancer Research Fellowship. There, he performed research on the molecular genetics of cancer at the Norris Cancer Center and at LA Children’s Hospital. After completing his Doctor of Philosophy degree, he moved to Stanford University, where he earned his medical degree, and developed an interest in radiation oncology. Dr. Biggs completed his residency in radiation oncology at the University of California, San Francisco, where he eventually served as chief resident.
For five years, Dr. Biggs performed radiosurgery at Barrow Neurological Institute and also served as director of the Baptist Oncology Center.
Dr. Biggs is certified by the American Board of Radiology and is a Diplomat of the American Society of Therapeutic Radiation Oncology. He is a member of the American Association for Cancer Research, Radiology Society of North America, American Society of Therapeutic Radiation Oncology and the American Association of Advancement of Science.
Dr. Biggs is a multi-year “Top Doc” honoree by Phoenix Magazine.
Patient Reviews:
"My experience was great I even had to travel from Yuma AZ for my treatments. DR Biggs made everything go as easy and painless for me. his staff were extremely kind and professional just like him! I appreciate so much for their empathy they had for me and my battle with cancer. Thank you from the bottom of my heart. I highly recommend this office." -Jen
"The office visit was for my husband Jessie Wilson. Dr. Biggs is excellent at relieving any anxiety we had going in. He took the time to explain everything as well as talking about personal info to get to know us better. We left feeling very relaxed and confident in his care moving forward. We highly recommend Dr. Biggs and his entire staff to anyone who needs treatment!" -Linda
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Dr. Christopher Biggs, MD
Radiologist
14155 N. 83rd Ave.
#127
Peoria, AZ 85381
Dr. Jason Samuelian is a Board-certified Radiation Oncologist, with expertise in novel radiation techniques including Intensity Modulated Radiation Therapy (IMRT), Image Guided Radiation Therapy (IGRT), Stereotactic Radiosurgery (SRS), and Stereotactic Ablative Radiotherapy (SABR). He has a particular interest in using new and advanced treatment techniques to minimize side effects. He derives great satisfaction from spending time with his patients and developing relationships with them that last long beyond their cancer care.
Dr. Samuelian joined Arizona Center for Cancer Care in 2015. He earned his Bachelor of Science degree in Exercise Physiology from Brigham Young University, where he graduated cum laude. He earned his medical doctorate at Midwestern University in Glendale, where he was awarded the MICA Scholastic Award in 2008, and graduated with Honors in 2010. He completed an internal medicine internship at Banner Good Samaritan Medical Center, followed by residency training at the Baylor College of Medicine, where he also served as chief resident. In addition, Dr. Samuelian has completed two brachytherapy fellowships — at the MD Anderson Cancer Center and the Seattle Prostate Institute.
Dr. Samuelian is a member of the American Society of Therapeutic Radiation Oncology, American Brachytherapy Society, American College of Radiology, American College of Radiation Oncology, and the American Society of Clinical Oncology. He has been invited to serve on the ASCO Professional Development Committee. He currently serves as Chairman of the Cancer Committee at Banner Boswell Medical Center in Sun City, a program accredited by the Commission on Cancer (CoC).
Dr. Samuelian actively participates in cooperative group clinical trials. His research has been published in peer-reviewed medical journals, and he has presented at national meetings on SABR for COPD patients with early-stage lung cancer, IMRT for the treatment of rectal cancer, and prostate cancer brachytherapy, among others.
Patient Reviews:
"Dr. Samuelian has always been very honest and truthful in presenting us with our options I trust his opinion 100 present and would highly recommend him to anyone seeking his treatment." -Rick
"I have been very impressed with Dr. Jason Samuelian. He seems extremely knowledgeable. I have had several doctors that had horrible bedside manner. Dr. Samuelian has an incredible bedside manner. It was so obvious that he was really concerned with my welfare. I would also like to do a shout out to his support team. They were incredible, and kind. I can't say enough about the entire experience. I'd give him six stars if I could." -Peter
Dr. Jason Samuelian, DO
Radiologist
14155 N. 83rd Ave.
#127
Peoria, AZ 85381
Dr. Terry Lee specializes in radiation oncology, and has extensive experience in brain, head and neck, lung, and gastrointestinal cancer.
Dr. Lee co-founded Arizona Center for Cancer Care in 2008 with Drs. Devinder Singh, Christopher Biggs and Daniel Reed. He received his Bachelor of Science degree in Mechanical Engineering from the University of California, Los Angeles, and his Master of Science degree in Nuclear Engineering from the Massachusetts Institute of Technology, where he explored new treatment options for brain tumors using Boron Neutron Capture Therapy. Dr. Lee attended medical school at Tufts University School of Medicine, where he would also complete his internship, before completing his residency at the University of California, San Francisco, where he would eventually serve as chief resident.
Dr. Lee certified by the American Board of Radiology, and he is a Diplomat of the American Society of Therapeutic Radiation Oncology. He is a multi-year “Top Doc” honoree by Phoenix Magazine.
Patient Reviews:
"Dr. Lee and all personnel are very good the Dr. explained with details my problem and all personnel are professional and treated me with care." -Sylvia
"Dr. Lee was great, kept us updated with treatment. Checking how everything thing was going & answered all questions. The staff was always very will to help!
Thanks again!!!!!!!!!!" -Tom
Dr. Terry Lee, MD
Radiologist
14155 N. 83rd Ave.
#127
Peoria, AZ 85381
Biography:
• College: Bachelor of Science (St. Cloud State University-St. Cloud, Minnesota)
• Physician Assistant Program: Master of Physician Assistant Studies (Northern Arizona University-Flagstaff, AZ)
• Board Certification: Certified Physician Assistant
• Language: English
Karlee grew up in a small town in Southern Wisconsin and went on to attend St. Cloud State University in Minnesota, where she played NCAA college soccer. After earning a degree in biomedical science with magna cum laude honors, she pursued her passion for medicine by obtaining a Physician Assistant degree from Northern Arizona University. During her time at Northern Arizona University she was an Arizona Area Health Education Center Scholar, engaging in a comprehensive two year interprofessional program that focused on preparing healthcare professionals for practice in underserved communities. This experience combined hands-on clinical training with community based learning, fostering a deep understanding of diverse patient needs.
Outside of work she enjoys reading, running, yoga, and spending quality time with family. Her commitment to ongoing learning and staying current with the latest medical advancements ensures that she is always equipped to deliver high quality care to her patients.
Karlee Krebs
Physician Assistant
14155 N. 83rd Ave.
#127
Peoria, AZ 85381
Arizona Center for Cancer Care is a cancer center without walls, offering the best doctors, best treatments, best technologies, and best research to give patients the best care possible. With offices in Avondale, Chandler, Gilbert, Glendale, Mesa, Phoenix, Scottsdale, Surprise, Anthem, Peoria, Fountain Hills, Wickenburg, Apache Junction, Sun City, Sun City West, Goodyear, Prescott Valley, and Tempe, Arizona, the multi-specialty practice cares for more than 30,000 patients across the Valley.
Arizona Center for Cancer Care specializes in treating many types of cancer, including multiple myeloma, colon, head and neck, breast, skin, and pancreatic, as well as brain cancer, lung cancer, and gastrointestinal cancer.
The practice uses the most current treatment options available, including various forms of radiation oncology and medical oncology, and hematology. The center also includes experts in gynecologic oncology and breast surgery and has a newly diagnosed breast cancer clinic.
The board-certified radiation oncologists at Arizona Center for Cancer Care use positron emission tomography/computed tomography (PET/CT) imaging to reveal the presence and severity of cancer and create an effective treatment plan.
Dedicated to providing its patients with the most current drugs and therapies available, Arizona Center for Cancer Care participates in multiple clinical trials.
Cancer is a disease of survivors, and Arizona Center for Cancer Care is keeping it that way.
For comprehensive, high-quality cancer care, call Arizona Center for Cancer Care or schedule an appointment online today. Telemedicine appointments are available.
Dr. Shelley Nakamura, MD
Surgeon
15000 N 83rd Ave
#200
Peoria, AZ 85381
Dr. Sara Zakem is a board-certified radiation oncologist with expertise in the management of all cancer types using advanced techniques including brachytherapy, Stereotactic Body Radiotherapy (SBRT), Stereotactic Radiosurgery (SRS), Intensity Modulated Radiation Therapy (IMRT), Volumetric Modulated Arc Therapy (VMAT) and Image Guided Radiotherapy (IGRT). Originally from Grand Rapids, MI, Dr. Zakem served as chief resident of radiation oncology at the University of Colorado before beginning her career as a radiation oncologist at the University of Washington. She joined Arizona Center for Cancer Care after moving to Phoenix with her husband, a head and neck cancer surgeon, in 2023.
Dr. Zakem is an active member of the radiation oncology community, serving on the American Society for Radiation Oncology (ASTRO) Early Career Committee and the American College of Radiation Oncology (ACRO) New Practitioner and Communications Committees. As a resident, she additionally served as the Communications Chair for the Society for Women in Radiation Oncology (SWRO) and was elected to the Gold Humanism Honor Society by her colleagues for her commitment to providing compassionate, patient-centered care. She has authored numerous peer-reviewed publications on esophageal, pancreatic, gynecologic, and head and neck cancers.
Having been personally touched by cancer, Dr. Zakem recognizes that receiving a cancer diagnosis is often one of the most frightening and confusing times for a patient and their loved ones. She is dedicated to taking the time needed to help patients understand and navigate their cancer diagnoses, clearly communicating the role of radiation therapy and how it can best be used to help patients achieve their goals of care.
In her free time, Dr. Zakem enjoys spending time with her husband and two cats, live music, yoga, skiing, spending time outdoors, and rooting for her Michigan Wolverines - Go Blue!
Patient Reviews:
"Very friendly, careful to explain everything. Kind and caring." -Steve
Dr. Sara Zakem, MD
Radiologist
15000 N 83rd Ave
#200
Peoria, AZ 85381
Melissa Aswad is a twice-graduate of Northern Arizona University with both her Bachelor of Science (BS, 2014) and Master of Physician Assistant Studies (MPAS, 2021). Prior to starting her career as a physician assistant, Melissa worked as a medical laboratory scientist after completing her training at the Cleveland Clinic. She worked in a hospital laboratory for several years performing complex testing but missed interacting directly with patients. This led her to return to school and pursuing a career as a physician assistant. She has experienced caregiving for a loved one with cancer and enjoys assisting her patients and their families in navigating a new diagnosis. She particularly enjoys assisting patients in living with metastatic cancer and helping them maximize their life outside of the oncology office. When she is not working Melissa enjoys hiking, backpacking, attending live music, reading, and spending time with her husband and cat.
Melissa Aswad, PA-C
Physician Assistant
15000 N 83rd Ave
#200
Peoria, AZ 85381
Dr. Andrew J. Buresh specializes in medical oncology, hematology, and internal medicine. He is interested in all aspects of clinical oncology and hematology, with a particular interest in gastrointestinal, breast, lung, and prostate cancer, as well as myelodysplasia, coagulation disorders, lymphoma, and myeloma.
Dr. Buresh joined Arizona Center for Cancer Care in 2013 when Desert Springs Cancer Care Center, which he founded and partnered with the practice. He is a member of the American Society of Clinical Oncology, American Society of Hematology and Arizona State Physicians Association.
Dr. Buresh is a multi-year “Top Doc” honoree by Phoenix Magazine and was chosen for the cover of the annual ranking magazine in 2013. He was also honored by the Phoenix Business Journal as among its “40 Top Business Leaders under Age 40.”
Dr. Buresh and his wife are blessed to be the proud parents of three beautiful children. When not caring for patients, Dr. Buresh enjoys spending his time with family, exercising, reading, playing basketball, golf, guitar, and coaching youth sports. He also speaks basic medical Spanish.
Patient Reviews:
"Warm and caring in all aspects of care. He’s special in his approach and looks at the big picture. Spends a lot of time asking questions and is conservative in his approach. So glad I was referred to him and will continue to refer him to others. Don’t be afraid~ take him on your journey with you!" -Robin
"Excellent Hematologist/Oncologist!!!" -Medi
Dr. Andrew Buresh, MD
Internist
15000 N 83rd Ave
#200
Peoria, AZ 85381
Dr. Singavi’s clinical interests include solid tumors and hematologic disorders (both malignant and non-malignant – thrombotic/bleeding disorders/etc.). His special interests include Neuro-oncology, Breast Oncology, and Genitourinary.
When not working, Dr. Singavi enjoys spending time with his family, traveling, and watching sports.
Patient Reviews:
"My father has been a patient of Dr Singavi for 3 years. Dr Singavi is an absolute gem! He is compassionate and very knowledgeable. He takes his time to listen to patient concerns and help the patient/family understand the treatment plan. I can’t say enough how grateful I am my father is in his care. It’s so rare to find a doctor that is both skilled in his field and has top notch bed side manor. Dr Singavi is both!!" -Laura
"Dr. Singavi is the most amazing Dr. He is kind, compassionate, and takes all the time in the world to make sure you understand your condition, and your treatment plan. His entire office staff is also very compassionate and carring. If you have to see an Oncologist, and let's face it, nobody wants to, Dr. Singavi and his staff are the people you want to be with during your care." -Sandy
Dr. Arun Singavi, MD, MS
Internist
15000 N 83rd Ave
#200
Peoria, AZ 85381
Dr. Michele Sazama is a board-certified adult nurse practitioner with extensive clinical experience, including over twenty years working with oncology patients. She holds national specialty certifications as an Advanced Oncology Certified Nurse Practitioner (AOCNP) and Board-Certified Medical Affairs Specialist (BCMAS).
Dr. Sazama was an instructor for Johns Hopkins University School of Nursing for many years and continues to serve as adjunct faculty for the Arizona State University nursing program. She created and directed a formal clinical rotation in oncology for graduate and doctoral nursing candidates, helping Arizona students develop their ability to safely care for oncology patients.
Dr. Sazama practices evidence-based medicine with a holistic focus and respect for individual choice.
Her clinical interests include psychoneuroimmunology, stress response, coping mechanisms, biofeedback, culturally diverse healing modalities, metaphysical science, meditation, and neuroplasticity.
Michele Sazama, NP
Nurse Practitioner
15000 N 83rd Ave
#200
Peoria, AZ 85381
Getting diagnosed with cancer is very difficult for patients and their families but getting treatment for cancer should not be. Dr. Agarwal approaches all cancer patients with the goal of giving them the most up-to-date and individualized cancer treatment in an efficient way so they can continue to live their lives as close to normal as possible
Dr. Agarwal specializes in all different types of cancer and blood related problems such as lung, gastrointestinal, prostate, genitourinary, gynecologic, neurologic, lymphomas, leukemia, anemia, platelets clotting disorders, etc. He is also interested in clinical trials and has completed advanced training in clinical trials and research. In addition, he has published several papers and has presented at national and international cancer meetings.
In his free time, Dr. Agarwal enjoys traveling, watching movies, playing tennis and golf.
Dr. Rishi Agarwal, MD
Oncologist
15000 N 83rd Ave
#200
Peoria, AZ 85381
Dr. Cory Heal is a radiation oncologist who has expertise in a full breadth of radiation oncology treatments for both malignant and benign diseases in children and adults.
Before joining Arizona Center for Cancer Care, Dr. Heal received a Bachelor of Science from Brigham Young University and his Medical Doctorate from Drexel University. He then completed an internship in Internal Medicine at Abington Memorial Hospital and a residency in radiation oncology at the University of Arizona, where he served as Chief Resident.
Dr. Heal specializes in the treatment of malignancies of the breast, prostate, lung, skin, head and neck, gynecological tract, gastrointestinal tract, central nervous system, hematologic/lymphatic systems, and musculoskeletal systems. He also treats a wide array of benign diseases that benefit from radiation. Dr. Heal utilizes the latest treatment techniques in his practice, including Stereotactic Radiosurgery (SRS), Intensity Modulated Radiation Therapy (IMRT), Image-Guided Radiation Therapy (IGRT), PLUVICTO, LUTATHERA, and Stereotactic Ablative Radiotherapy (SABR/SBRT). Dr. Heal has additional specialized training and research interests in the use of HDR brachytherapy for several anatomic sites. His other research interests include patient safety and quality improvement.
An Arizona native who grew up in the East Valley, Dr. Heal feels privileged to serve the community he loves. He always seeks to be an advocate for his patients as he guides them through treatment. He enjoys the lasting relationships he develops with his patients and their families and feels honored to take part in their care.
Dr. Heal and his wife, Emily, have four children. Outside of medicine, Dr. Heal loves spending his free time being a dad, cooking new foods in the kitchen, and making memories with his family outdoors.
Patient Reviews:
"Dr. Heal and his team were so thorough and thoughtful with explanations which reduced my anxiety and made daily radiation appointments very easy to manage!" -Wendy
"Couldn't be more satisfied with Dr. Heal. He's a wonderful person both personally and professionally, making sure to explain every aspect of the treatment for my brain cancer, as well as being an all-around good guy! I'm a lucky man." - Daniel
Dr. Cory Heal, MD
Radiologist
15000 N 83rd Ave
#200
Peoria, AZ 85381
Dr. Gerald Lucas is board certified in Radiation Oncology, and a member of the American Society for Therapeutic Radiology and Oncology, the American Brachytherapy Society, and the American Society of Clinical Oncology. After completing medical school at Indiana University, and his residency at University of Southern California, he established his practice in 1992 at Banner Good Samaritan Medical Center in Phoenix. Dr. Lucas served as the Medical Director of Radiation Oncology services at Good Samaritan until he joined Arizona Oncology in 2008. He practiced there for over a decade prior to joining Arizona Center for Cancer Care.
Dr. Lucas has extensive experience with the utilization of advanced technologies, including image guided radiation therapy (IGRT), intensity modulated radiation therapy (IMRT), stereotactic radiosurgery (SRS) and brachytherapy. In addition, he is highly skilled and has extensive experience with brachytherapy for the treatment of gynecologic and breast diseases, including accelerated partial breast irradiation (APBI). In addition, Dr. Lucas has a special interest in the treatment of prostate, lung, and colorectal tumors, as well as brain tumors and sarcomas. Dr. Lucas is a published writer and speaker on various radiation topics.
Patient Reviews:
"My experience with Dr. Lucas has been excellent. He is willing to spend whatever amount of time you need to fully understand your situation and what options may be available to you. He also went to bat for me with my insurance provider when they initially refused to pay for a particular procedure. He convinced them that it was totally necessary, and they then agreed to cover it. Also, his staff is first class. The whole office has been a joy to work with. Thank you!!" -Gary
"I was recommended to Dr Lucas, MD from my Urologist. Dr Lucas was very professional and spent the appropriate time to make sure I understood all my options and answered all my questions." -Michael
Dr. Gerald Lucas, MD
Radiologist
15000 N 83rd Ave
#200
Peoria, AZ 85381
Dr. Justin Goldfarb specializes in medical oncology, internal medicine, and hematology.
Growing up in suburban Detroit, Dr. Goldfarb followed his true passion to become a hematologist and medical oncologist. A published author on topics including lymphoma and breast cancer, he is double board-certified in medical oncology and internal medicine, and fellowship-trained in hematologic disorders and solid tumors.
Dr. Goldfarb earned a bachelor’s degree from the University of Colorado at Boulder and holds a medical degree from Midwestern University in Chicago. He completed an internal medicine residency at Rush University Medical Center in Chicago, followed by a medical oncology fellowship at Baylor University Medical Center in Dallas. With academic appointments at Pritzker School of Medicine at the University of Chicago and Midwestern University, Dr. Goldfarb thoroughly enjoys teaching and mentoring medical students.
Patient Reviews:
"The care I receive from Dr. Goldfarb is exceptional. He listens attentively to my concerns and he provided me with a treatment plan that yields positive results. The entire team at the clinic display a high level of professionalism and make me feel comfortable while I'm there . Nicole Lee is exceptional as well." -Christian
"Dr Goldfarb has been helping me fight lung cancer for two years and is a very caring person." -JC
Dr. Justin Goldfarb, DO
Oncologist
15000 N 83rd Ave
#200
Peoria, AZ 85381