Meet the Digestive Cancer Team

Our Philosophy

At the Providence Orange County Cancer Institute, our team offers extensive expertise and a seamlessly coordinated approach to your care. You’ll be supported by experienced surgeons, oncologists, nurses, and specialized support staff who collaborate closely to design and deliver the most appropriate treatment for you.

Colon and Rectal Surgery

Photo of Brady, Matthew T - MD - 3394104 - 1376863621

Matthew T. Brady, MD

Colon and Rectal Surgery, General Surgery

Matthew T. Brady, MD

Colon and Rectal Surgery, General Surgery

South Orange County Surgical Medical Group

Photo of Ghukasyan, Razmik - MD, MBA - 5331877 - 1164953071

Razmik Ghukasyan, MD, MBA

Colon and Rectal Surgery, General Surgery

Razmik Ghukasyan, MD, MBA

Colon and Rectal Surgery, General Surgery

St. Jude Heritage Fullerton - Sunny Crest General Surgery

+ 1 other location

Photo of Gregory, Anita K - MD - 3611935 - 1881655868

Anita K. Gregory, MD

Colon and Rectal Surgery

Anita K. Gregory, MD

Colon and Rectal Surgery

My Approach to Your Health

Orange Surgical Associates

+ 1 other location

Photo of Hwang, Grace S - MD - 3611105 - 1053720797

Grace S. Hwang, MD

Colon and Rectal Surgery

Grace S. Hwang, MD

Colon and Rectal Surgery

Orange Surgical Associates

Photo of Kinzinger, Kevin - MD - 3617243 - 1760554232

Kevin Kinzinger, MD

Colon and Rectal Surgery, General Surgery, Breast Surgery

4.8 (77 Ratings)

Kevin Kinzinger, MD

Colon and Rectal Surgery, General Surgery, Breast Surgery

St. Jude Heritage Fullerton - Sunny Crest General Surgery

+ 2 other locations

Photo of Won, Roy P - MD, FACS - 5332086 - 1225470354

Roy P. Won, MD, FACS

Colon and Rectal Surgery, General Surgery

Roy P. Won, MD, FACS

Colon and Rectal Surgery, General Surgery

St. Jude Heritage Fullerton - Sunny Crest General Surgery

+ 1 other location

Gastroenterology

Amit Raina, MD

Gastroenterology

Amit Raina, MD

Gastroenterology

Amit Raina, MD, Inc.

+ 1 other location

Photo of Riff, Brian P - MD - 3389409 - 1194969030

Brian P. Riff, MD

Gastroenterology

Brian P. Riff, MD

Gastroenterology

Associated Gastroenterology

+ 1 other location

Photo of Singh, Hardeep M - MD - 3391631 - 1275544074

Hardeep M. Singh, MD

Gastroenterology

Hardeep M. Singh, MD

Gastroenterology

My Approach to Your Health

InSite Digestive Health Care

General Surgery

Photo of Abbass, Ahmad A - MD - 3394110 - 1790946895

Ahmad A. Abbass, MD

Hepatobiliary and Pancreatic Surgery, General Surgery

Ahmad A. Abbass, MD

Hepatobiliary and Pancreatic Surgery, General Surgery

South Orange County Surgical Medical Group

Photo of Ahmed, Saif - DO - 5812662 - 1669911574

Saif Ahmed, DO

General Surgery

Saif Ahmed, DO

General Surgery

St. Jude Heritage Fullerton - Sunny Crest General Surgery

Photo of Bacon, Louise N - MD - 3394391 - 1063732428

Louise N. Bacon, MD

Bariatric Surgery, General Surgery

Louise N. Bacon, MD

Bariatric Surgery, General Surgery

South Orange County Surgical Medical Group

Photo of Bildzukewicz, Nikolai A - MD - 3626727 - 1255547493

Nikolai A. Bildzukewicz, MD

General Surgery

5.0 (103 Ratings)

Nikolai A. Bildzukewicz, MD

General Surgery

My Approach to Your Health

2025 Golden State Patient Experience Award

St. Jude Heritage Center for Foregut Surgery

+ 2 other locations

Matthew T. Brady, MD

Colon and Rectal Surgery, General Surgery

Matthew T. Brady, MD

Colon and Rectal Surgery, General Surgery

South Orange County Surgical Medical Group

Photo of Chang, Steven T - MD - 3394051 - 1205048436

Steven T. C. Chang, MD

General Surgery

Steven T. C. Chang, MD

General Surgery

Surgical Group of South Laguna

Photo of Christian, Ashton B - MD - 3589176 - 1699207704

Ashton B. Christian, MD

General Surgery

Ashton B. Christian, MD

General Surgery

South Orange County Surgical Medical Group

Photo of Coccia, Michael T - MD - 3394496 - 1396966495

Michael T. Coccia, MD

General Surgery

Michael T. Coccia, MD

General Surgery

Surgical Group of South Laguna

Photo of El-Bayar, Hisham M - MD - 3394105 - 1659376622

Hisham M. El-Bayar, MD

General Surgery, Surgical Oncology, Hepatobiliary and Pancreatic Surgery

Hisham M. El-Bayar, MD

General Surgery, Surgical Oncology, Hepatobiliary and Pancreatic Surgery

My Approach to Your Health

Orange Surgical Associates

Razmik Ghukasyan, MD, MBA

Colon and Rectal Surgery, General Surgery

Razmik Ghukasyan, MD, MBA

Colon and Rectal Surgery, General Surgery

St. Jude Heritage Fullerton - Sunny Crest General Surgery

+ 1 other location

Kevin Kinzinger, MD

Colon and Rectal Surgery, General Surgery, Breast Surgery

4.8 (77 Ratings)

Kevin Kinzinger, MD

Colon and Rectal Surgery, General Surgery, Breast Surgery

St. Jude Heritage Fullerton - Sunny Crest General Surgery

+ 2 other locations

Photo of Purdy, Amanda C - MD - 3626551 - 1487181749

Amanda C. Purdy, MD

General Surgery

4.9 (53 Ratings)

Amanda C. Purdy, MD

General Surgery

2025 Golden State Patient Experience Award

St. Jude Heritage Fullerton - Sunny Crest General Surgery

+ 2 other locations

Photo of Shaver, John K - MD - 3393998 - 1598765729

John K. Shaver, MD

General Surgery

John K. Shaver, MD

General Surgery

South Orange County Surgical Medical Group

Photo of Stapfer, Maria V - MD - 3625650 - 1073543146

Maria V. Stapfer, MD

General Surgery

5.0 (54 Ratings)

Maria V. Stapfer, MD

General Surgery

My Approach to Your Health

2025 Golden State Patient Experience Award

St. Jude Heritage Center for Foregut Surgery

Roy P. Won, MD, FACS

Colon and Rectal Surgery, General Surgery

Roy P. Won, MD, FACS

Colon and Rectal Surgery, General Surgery

St. Jude Heritage Fullerton - Sunny Crest General Surgery

+ 1 other location

Photo of Yoshida, Miya C - DO - 4213335 - 1982191755

Miya C. Yoshida, DO

Bariatric Surgery, General Surgery

Miya C. Yoshida, DO

Bariatric Surgery, General Surgery

Miya Yoshida, DO

+ 1 other location

Hematology Oncology

Photo of Byun, Timothy E - MD - 3587902 - 1871545012

Timothy E. Byun, MD

Hematology Oncology

4.9 (320 Ratings)

Timothy E. Byun, MD

Hematology Oncology

My Approach to Your Health

St. Joseph Heritage Medical Group - Hematology Oncology

Photo of Cheng, Howard H - MD - 3409039 - 1366435299

Howard H. W. Cheng, MD

Hematology Oncology

Howard H. W. Cheng, MD

Hematology Oncology

Howard Cheng, MD

Photo of Fong, Minch K - MD - 3587646 - 1407849284

Minch K. Fong, MD

Hematology Oncology

4.8 (248 Ratings)

Minch K. Fong, MD

Hematology Oncology

My Approach to Your Health

Mission Heritage - Hematology and Oncology

Photo of Hu, John Y - MD - 3587650 - 1649698127

John Y. Hu, MD

Hematology Oncology

4.9 (222 Ratings)

John Y. Hu, MD

Hematology Oncology

Mission Heritage - Hematology and Oncology

Photo of Huang, Sam S - MD - 3392849 - 1841248812

Sam S. Huang, MD

Hematology Oncology

4.9 (323 Ratings)

Sam S. Huang, MD

Hematology Oncology

St. Joseph Heritage Medical Group - Hematology Oncology

+ 1 other location

Photo of Kim, Steven W - MD - 3392699 - 1003886698

Steven W. Kim, MD

Hematology Oncology

4.9 (411 Ratings)

Steven W. Kim, MD

Hematology Oncology

2025 Golden State Patient Experience Award

Crosson Cancer Institute

+ 1 other location

Photo of Lee, Monica E - MD - 3627269 - 1215129309

Monica E. Lee, MD

Hematology Oncology

4.9 (368 Ratings)

Monica E. Lee, MD

Hematology Oncology

2025 Golden State Patient Experience Award

Crosson Cancer Institute

Photo of Li, Ming C - MD - 3392788 - 1770843054

Ming C. Li, MD

Hematology Oncology

5.0 (220 Ratings)

Ming C. Li, MD

Hematology Oncology

2025 Golden State Patient Experience Award

Mission Heritage - Hematology and Oncology

Photo of Lyou, Yung - MD - 3392293 - 1013277342

Yung Lyou, MD

Medical Oncology, Hematology Oncology

4.8 (240 Ratings)

Yung Lyou, MD

Medical Oncology, Hematology Oncology

Crosson Cancer Institute

Photo of Mahmood, Tariq - MD - 3392740 - 1104874171

Tariq Mahmood, MD

Hematology Oncology

4.9 (395 Ratings)

Tariq Mahmood, MD

Hematology Oncology

My Approach to Your Health

2025 Golden State Patient Experience Award

St. Joseph Heritage Medical Group - Hematology Oncology

Photo of Miranda, George G - MD - 3392296 - 1558545038

George G. Miranda, MD

Hematology Oncology

5.0 (343 Ratings)

George G. Miranda, MD

Hematology Oncology

2025 Golden State Patient Experience Award

Mission Heritage - Hematology and Oncology

Photo of Mummaneni, Madhavi - MD - 3625479 - 1316999550

Madhavi Mummaneni, MD

Hematology Oncology

4.8 (251 Ratings)

Madhavi Mummaneni, MD

Hematology Oncology

St. Joseph Heritage Medical Group - Hematology Oncology

Photo of Nan, Xinyu - MD - 3392601 - 1326458175

Xinyu Nan, MD

Hematology Oncology

4.9 (345 Ratings)

Xinyu Nan, MD

Hematology Oncology

St. Joseph Heritage Medical Group - Hematology Oncology

Photo of Otis, Stavroula A - MD - 3396958 - 1477677557

Stavroula A. Otis, MD

Hematology Oncology

Stavroula A. Otis, MD

Hematology Oncology

Center for Cancer and Blood Disorders

Photo of Panares, Roy L - MD - 3625550 - 1285837229

Roy L. Panares, MD

Hematology Oncology

4.9 (353 Ratings)

Roy L. Panares, MD

Hematology Oncology

Crosson Cancer Institute

Photo of Park, David J - MD - 3587852 - 1275619447

David J. Park, MD

Hematology Oncology

4.9 (364 Ratings)

David J. Park, MD

Hematology Oncology

Crosson Cancer Institute

Photo of Patel, Giribala R - MD - 3392730 - 1033106562

Giribala R. Patel, MD

Hematology Oncology

4.9 (256 Ratings)

Giribala R. Patel, MD

Hematology Oncology

Crosson Cancer Institute

Photo of Sharma, Sanjay - MD - 3627246 - 1174609358

Sanjay Sharma, MD

Hematology Oncology

4.9 (303 Ratings)

Sanjay Sharma, MD

Hematology Oncology

Crosson Cancer Institute

Photo of Spector, Kellie D - MD - 3397128 - 1700374469

Kellie D. Spector, MD

Hematology Oncology

Kellie D. Spector, MD

Hematology Oncology

Center for Cancer and Blood Disorders

Photo of Wong, John K - MD - 3397126 - 1336436500

John K. Wong, MD

Hematology Oncology

John K. Wong, MD

Hematology Oncology

Cancer & Blood Specialty Clinic

Medical Oncology

Yung Lyou, MD

Medical Oncology, Hematology Oncology

4.8 (240 Ratings)

Yung Lyou, MD

Medical Oncology, Hematology Oncology

Crosson Cancer Institute

Radiation Oncology

Photo of Ash, Robert B - MD - 3408517 - 1326238650

Robert B. Ash, MD

Radiation Oncology

Robert B. Ash, MD

Radiation Oncology

My Approach to Your Health

Center for Cancer Prevention and Treatment

Photo of Bhandari, Tanuja A - MD - 3605309 - 1518147610

Tanuja A. Bhandari, MD

Radiation Oncology

Tanuja A. Bhandari, MD

Radiation Oncology

Center for Cancer Prevention and Treatment

Photo of Chou, William W - MD - 3604580 - 1790713253

William W. Chou, MD

Radiation Oncology

William W. Chou, MD

Radiation Oncology

Mission Viejo Radiation Oncology

Photo of Dolkar, Dechen - MD - 3410080 - 1861475683

Dechen Dolkar, MD

Radiation Oncology

Dechen Dolkar, MD

Radiation Oncology

Fred A. Jordan Family Radiation Oncology Center

+ 1 other location

Photo of Liu, Gene-Fu F - MD - 3605185 - 1639306426

Gene-Fu F. Liu, MD

Radiation Oncology

Gene-Fu F. Liu, MD

Radiation Oncology

Mission Viejo Radiation Oncology

Photo of Sheu, Tommy - MD - 3604431 - 1568880060

Tommy Sheu, MD

Radiation Oncology

Tommy Sheu, MD

Radiation Oncology

Fred A. Jordan Family Radiation Oncology Center

Photo of Williams, Venita L - MD - 3604689 - 1659581775

Venita L. Williams, MD

Radiation Oncology

Venita L. Williams, MD

Radiation Oncology

Center for Cancer Prevention and Treatment

Surgery

Ahmad A. Abbass, MD

Hepatobiliary and Pancreatic Surgery, General Surgery

Ahmad A. Abbass, MD

Hepatobiliary and Pancreatic Surgery, General Surgery

South Orange County Surgical Medical Group

Hisham M. El-Bayar, MD

General Surgery, Surgical Oncology, Hepatobiliary and Pancreatic Surgery

Hisham M. El-Bayar, MD

General Surgery, Surgical Oncology, Hepatobiliary and Pancreatic Surgery

My Approach to Your Health

Orange Surgical Associates

Popular Searches

Quick Links

Meet the Digestive Cancer Team

Our Philosophy

Colon and Rectal Surgery

Gastroenterology

General Surgery

Hematology Oncology

Medical Oncology

Radiation Oncology

Surgery

OUR MISSION

OUR VALUES

ACROSS PROVIDENCE

RESOURCES

Popular Searches

Quick Links

Meet the Digestive Cancer Team

Our Philosophy

Colon and Rectal Surgery

Gastroenterology

General Surgery

Hematology Oncology

Medical Oncology

Radiation Oncology

Surgery

OUR MISSION

OUR VALUES

ACROSS PROVIDENCE

RESOURCES

CONNECT WITH US