Our Cancer Specialists in Arizona

Dr. Gordon L. Grado

Dr. Gordon L. Grado

Founder and Medical Director of the Southwest Oncology Centers

Dr. Gordon Grado is the founder and medical director of the Southwest Oncology Centers and the Grado Radiation Center of Excellence. He was born in Waterloo, Iowa and grew up in the Midwest. He has been married for 33 years to wife, research coordinator, and co-author of numerous articles, Mary Grado. They have three children, Katherine, Gordon Jr., and Michael.

He received his M.D. degree from Southern Illinois University School of Medicine and completed his internship at the University of Chicago followed by a residency to specialize in the treatment of cancer with radiation at the Mayo Clinic in Rochester, Minnesota.

Dr. Grado established his brachytherapy program in 1989 while he was the Chairman of the Radiation Oncology Department located at the Mayo Clinic in Scottsdale, Arizona. After reviewing various techniques and programs that were available to treat prostate cancer, Dr. Grado and a team of other specialists developed the first interactive program that would utilize both biplane transferal ultrasound and fluoroscopic imaging. To date, Dr. Grado has personally performed over 4,000 brachytherapy procedures.

In June of 2000, Dr. Grado was personally invited by Jane Hull, the Governor of Arizona to be a member of the Prostate Cancer Task Force.

For several years, Dr. Grado has been affiliated with the University of Minnesota Radiation Oncology Staff as an associate professor. It allows Dr. Grado the chance to work with an interdisciplinary team of experts in radiation therapy, urology, and medical oncology to continue his commitment to conducting groundbreaking research and providing exceptional patient care.

Dr. Grado continues to work with radiation facilities around the world to help in the training and the perfection of prostate brachytherapy. Among the international sites Dr. Grado has visited are San Paulo and Porto Alegre (Brazil), Mexico City (Mexico) and Beijing (China). Dr. Marcio Fagundes of the Centro de Oncologia Radioterapica de RGS (COR) invited Dr. Grado to travel to Brazil and teach the seed implant procedure to urologists and radiation oncologist in Porto Alegre.

Dr. Keerti M. Khandelwal

Dr. Franklin S. Danziger

Dr. Keerti Khandelwal, the newest member of the Southwest Oncology Centers’ medical oncology/hematology team, graduated from Government Medical College, Surat, India in 2005. She then completed a Masters in Public Health at the University of Southern Mississippi, followed by a residency in Internal Medicine at Louisiana State University completed in 2012. She then continued her training with a Hematology/Oncology Fellowship also at Louisiana State, from which she graduated in 2015. In November 2015, Dr. Khandelwal joined Dr. Atilio Giangreco and Dr. Bruce Ethridge as a medical oncologist/hematologist at Southwest Oncology Centers in Yuma.

According to Dr. “K,” she became interested in oncology/hematology during her internal medicine residency. She is thankful to God for giving her the ability and opportunity to render compassionate care to patients in their most special time of need. Complexity and swift advancement in the field excites her and fuels her intrigue for science.

During her free time she loves to be with her family, especially her toddler son. She also likes to sketch, paint, read, do yoga, and listen to music. She is married to Dr. Shivang Shah who is a cardiologist in Yuma.


1) Jafri, S. H. R., Previgliano, C., Khandelwal, K., & Shi, R. (2015). Cachexia Index in Advanced Non-Small-Cell Lung Cancer Patients. Clinical Medicine Insights. Oncology, 9, 87–93.

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2) Keerti Munnalal Khandelwal, Carlos Prevegliano,, Runhua Shi, Guillermo Sangster, Eduardo Toledo Gonzalez, Syed Hasan Raza Jafri; Louisiana State University Health Sciences Center, Shreveport, LA; Division of Oncology, The University of Texas Health and Science Center at Houston, Houston, TX (2014) Sarcopenia as a marker of outcome in patients with metastatic non-small cell lung cancer: A retrospective review. ASCO abstract 2014.

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Board Certifications:

Internal Medicine 2012
Hematology 2015
Oncology 2015

Dr. Siavosh Vakilian

Dr. Siavosh Vakilian

Dr. Siavosh Vakilian completed his medical studies, internship in internal medicine and residency in radiation oncology at McGill University in Montreal, Quebec, Canada. He served as chief resident there in 2012. He then served as attending radiation oncologist at the Jewish General Hospital and faculty lecturer at the Department of Oncology at McGill University. He specalized in the treatment of breast, hematological, pulmonary and genito-urinary cancers. He helped run several clinical trials and authored several publications.

From 2015 to 2018, Dr. Vakilian practiced radiation oncology at Imperial Valley Cancer Center in El Centro, California, also serving as voluntary assistant clinical professor at the Department of Radiation Medicine and Applied Science at UCSD.

In his free time, he likes to swim, fish, hunt, exercise and spend time with his family. He is fluent in English, French and Persian (Farsi) and has a working knowledge of Spanish.

Dr. Vakilian is board certified in Radiation Oncology both by the Royal College of Physicians and Surgeons of Canada and the American Board of Radiology.

Dr. S. Giangreco, M.D.

Dr. S. Giangreco M.D.

Dr. Giangreco was born in Asuncion, Paraguay, South America. He went on to study medicine at the National University School of Medicine in Asuncion, Paraguay from 1962 to 1968. This led to him being a staff physician at the Cruz Blanca Clinic in Asuncion, from 1968 to 1974. Dr. Giangreco then came to the United States and became a U.S. citizen while completing his internship and residency at Lutheran Medical Center and Cleveland Metropolitan General Hospital in Cleveland, Ohio from 1974–1977. Dr. Giangreco pursued further training in a fellowship program in Medical Oncology at Johns Hopkins Hospital Oncology Center in Baltimore, Maryland.

Dr. Giangreco has medical licensure in several states: Michigan, Maryland, California, and Arizona. He is a diplomate of the American Board of Internal Medicine as well as the American Board of Oncology. Dr. Giangreco went on to have a solo practice in oncology/hematology in Rancho Mirage and El Centro, California, and finally moved his practice to Yuma, Arizona where he currently resides. In Yuma, Dr. Giangreco worked with the Yuma Regional Medical Center and, later on, created Giangreco Medical Group, a medical oncology/hematology private practice. He recently joined Southwest Oncology Centers with offices in Yuma and Phoenix. Dr. Giangreco enjoys spending time with his family and runs a well-attended monthly prayer support group in his office for the last ten years. He teaches the Bible and prays with patients and families for the well-being of his patients.

Dr. Robert O’Laughlin

Dr. Robert O'Laughlin

Dr. Robert O’ Laughlin has joined the medical staff of our newest cancer center in Bullhead City, AZ. He is originally from Cambridge, MA and grew up in new Jersey. He completed his undergraduate studies at Rutgers University in New Brunswick, NJ and in 1987 he earned his MD degree at UMDNJ-New Jersey Medical School in Newark, NJ. He completed his internship in internal medicine at Norwalk Hospital in Norwalk, CT in 1988. He completed his residency in radiation oncology at Cooper Hospital/University Medical Center in Camden, NJ in 1991. He earned his board certification in radiation oncology by the American College of Radiology in 1995.

Dr. O’ Laughlin has over 25 years of private practice experience in both hospitals based and freestanding cancer centers. He has previously held medical staff privileges at the Medical Center of Delaware in Newark, DE, Maui Memorial Medical Center in Wailuku, HI, St. Rose Dominican Hospital, and San Martin Campus in Las Vegas, NV.

He has a special interest in treating prostate, head & neck, dermatologic cancers as well as chronic pain management. He has extensive training in accelerated partial breast irradiation and electronic brachytherapy. Dr. O’ Laughlin has also served as an expert medical witness in medical malpractice cases. During his free time, he enjoys skiing, hiking, listening to music, attending concerts, and sporting events such as hockey, football, and basketball.

Dr. Valerie Israel

Dr. Valerie Israel

Valerie Israel, DO is a Medical Oncologist at Southwest Oncology Centers. Dr. Israel’s expertise includes general medical oncology and hematologic malignancies as well as benign hematologic diseases; she is board certified in medical oncology.

Dr. Israel received her medical degree from the College of Osteopathic Medicine of the Pacific in Pomona, California. She completed her internship and residency training in Internal Medicines at Los Angeles County Medical Center/University of Southern California, where she completed fellowships in medical oncology and in hematology as well.

As a two-time cancer survivor herself, Dr. Valerie Israel Feels deeply connected to her patients. Outside of work, Dr. Israel’s compassion is directed to her rescue sanctuary for abandoned animals.

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