Cancer Care Specialists of Illinois Welcomes Ryan C. Mueller, MD, BSRT(T)

(O’FALLON, IL) – Cancer Care Specialists of Illinois (CCSI) is pleased to announce the addition of Dr. Ryan C. Mueller, radiation oncologist, to its practice in July 2026. Dr. Mueller will primarily see patients at the Cancer Care Center of O’Fallon and Anderson Hospital Radiation Oncology Center in Maryville. He will also provide occasional services in Decatur and Effingham.

“We are excited to welcome Dr. Mueller to the Cancer Care Specialists team. Dr. Mueller is joining Dr. Jacob Witt at the Cancer Care Center of O’Fallon and will be integral to the continued delivery of excellent cancer care to O’Fallon and the surrounding communities.” – Justin D. Floyd, DO, FACOI, President of Cancer Care Specialists of Illinois.

Dr. Mueller has received several awards, including the Edward Mallinckrodt Award of Excellence, and has co-authored several publications on locally advanced non-small cell lung cancer, prostate cancer and bladder cancer.

Dr. Mueller is board certified in Radiation Oncology. He has specialized skills in radiotherapy techniques, including 3D conformal radiation therapy, IMRT/VMAT, SRS/SBRT, Brachytherapy and Radiopharmaceuticals. He also holds membership in the American Society for Radiation Oncology (ASTRO), American College of Radiation Oncology (ACRO) and American College of Radiology (ACR).

For more information visit Dr. Mueller’s bio page >