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Issac Benjamin Paz,

M.D.

Surgical Oncologist

4.9 (209 Ratings)
Biography photo
Location
City of Hope Comprehensive Cancer Center - Duarte
1500 East Duarte Road
Duarte, CA 91010
City of Hope South Pasadena
209 Fair Oaks Avenue
South Pasadena, CA 91030
Specialties
Breast Surgical Oncology
Gastroenterology
Surgical Oncology
Education
Medical school:
  • 1985, Masters in General Surgery, with honors, Universidad Catolica de Chile
  • 1981, M.D., with honors, Universidad de Chile
Residency:
  • 1989–1990, Chief resident, general surgery, University of Arizona, Tucson, AZ
  • 1985–1989, Resident, general surgery, University of Arizona, Tuczon, AZ
  • 1984–1985, Chief resident, general surgery, Universidad Catolica De Chile, Santiago
  • 1982–1984, Resident, general surgery, Universidad Catolica De Chile, Santiago
  • 1980–1981, Rotating intern, Universidad de Chile, Hospital Salvador
  • 1979–1982, Intern, Emergency unit of the Chilean Air Force Hospital
  • 1976–1982, Intern and student clerk, Emergency unit of the Hospital Salvador
Academic Appointments
  • Vice Chair, Clinical Affairs
  • Clinical Professor, Division of Surgical Oncology, Department of Surgery
About Me

I. Benjamin Paz, M.D., is a world-class cancer surgeon at City of Hope® Cancer Center Duarte who takes a compassionate, innovative approach to oncology care. Dr. Paz brings warmth and empathy to every patient interaction and believes that the goal of cancer treatment is to help people live full lives and pursue their dreams. 

Dr. Paz is an expert in breast, gastrointestinal and rectal cancers, as well as complex tumors affecting the bones and soft tissues. He has been a pioneer in minimally invasive cancer surgery and his leadership helped establish one of California’s premier centers for minimally invasive surgical oncology. 

Originally from Chile, Dr. Paz earned his medical degree there before continuing his training at the University of Arizona in Tucson. His global perspective and lifelong dedication to healing have shaped his career and his impact on thousands of patients. In addition to his clinical work, Dr. Paz has served as vice chair of the Department of Surgery at City of Hope. He played a key role in expanding surgical programs and launching multidisciplinary clinics designed to offer patients seamless, personalized care. 

Dr. Paz continues to embody the City of Hope mission—offering expertise, compassion, and genuine hope to every person who walks through the door.

Patient reviews
The patient ratings and comments on this page are obtained from an external Press Ganey® outpatient survey provided to all eligible City of Hope patients within one to two weeks of their treatment occurrence. Raw data from the answers to the survey questions about our physicians are calculated by Press Ganey into a one- to five- star rating. In the spirit of transparency, all patient comments are posted as written by the patient, whether they are positive or negative. We only exclude comments if they are deemed to be slanderous or libelous, contain profanity or vulgar language, or do not relate to the patient's experience with the doctor involved. As a result, the comments are the views and opinions of the patients surveyed and are not endorsed by, and may not necessarily reflect the opinion of, City of Hope.
Apr 28, 2026
5.0
"Dr. Paz is a wonderful doctor and kind human being. So very thoughtful and caring and excellent at what he does!"
Apr 24, 2026
5.0
"Dr. Paz is the best!"
Apr 14, 2026
5.0
"Dr Paz is provides an outstanding level of care. I can't imagine getting better care or feeling more confident in the health care I receive than I do with Dr. Paz."
Apr 3, 2026
5.0
"Dr Paz was excellent"
Mar 21, 2026
5.0
"The best ever!!"
Mar 19, 2026
5.0
"I loved the way he explained my situation with a drawing"
Mar 19, 2026
4.6
"Dr. Paz is super professional and has a good manner in speaking/listening to patient but is conservative in talking about details or post care when patient is inquisitive"
Mar 7, 2026
4.6
"Dr Paz was amazing"
Feb 22, 2026
5.0
"I went to get a second opinion and Dr. Paz was very good at explaining and was very open."
Feb 19, 2026
5.0
"Dr. Paz is extremely patient with all my questions. I ask a LOT of questions!"
Feb 8, 2026
5.0
"Very thorough and extensive explanation of options. Very specific."
Feb 8, 2026
5.0
"Dr. Paz made me feel very comfortable and confident and lessened my degree of anxiety over upcoming surgery."
Feb 7, 2026
5.0
"Dr and staff are outstanding!"
Jan 20, 2026
5.0
"Dr Paz is outstanding in every way."
Jan 20, 2026
5.0
"[...] I'd give care a 10. [...]"
Jan 17, 2026
5.0
"My provider, Dr Paz, is excellent!"
Jan 16, 2026
5.0
"Very systematically impressive overall."
Jan 16, 2026
5.0
"Already recommended"
Jan 7, 2026
5.0
"Very reassured by Dr Paz at a very tough time."
Dec 29, 2025
5.0
"All excellent."
Dec 29, 2025
5.0
"Of course, I would recommend them very professionally."
Dec 27, 2025
5.0
"Superior physician."
Dec 7, 2025
5.0
"Dr Paz is an excellent surgeon: expertise, experience, communication, bedside manner."
Dec 7, 2025
3.5
"It's a rewarding atmosphere, friendly people, all friendly staff, excellent, you can say"
Dec 7, 2025
3.5
"The doctor has not prescribed me anything, he told me that I would have to reduce my [...] and what not to eat and what to eat, medicine has not given me"
Nov 27, 2025
3.5
"Benjamin Paz is a real mensch."
Nov 27, 2025
3.5
"Dr. Paz is a great communicator, affable and human."
Nov 23, 2025
4.7
"I came in for a second opinion & left with him being my surgeon. :)"
Nov 16, 2025
4.7
"Dr. Paz is excellent."
Nov 12, 2025
5.0
"Dr. Paz is an excellent surgeon and doctor. I greatly appreciate his expertise."
Nov 9, 2025
5.0
"It was an excellent experience"
Nov 9, 2025
5.0
"For me it was an excellent experience"
Oct 24, 2025
5.0
"He was very attentive"
Oct 23, 2025
5.0
"Dr. Paz was kind and explained my situation and results very well. Each time I left an appointment with Dr. Paz I felt good and at peace with my situation."
Oct 21, 2025
5.0
"Very little was discussed as we await tests and results."
Oct 16, 2025
5.0
"DR. PAZ IS AN EXCELLENT AND VERY QUALIFIED PROFESSIONAL, HE IS A GREAT HUMAN BEING.., VERY FORTUNATE THAT HE IS MY DOCTOR."
Oct 9, 2025
5.0
"An excellent doctor."
Oct 9, 2025
5.0
"I will surely always recommend them."
Oct 3, 2025
5.0
"Dr was excellent, explained everything and genuinely cared about well being."
Sep 23, 2025
5.0
"Dr. Paz is a great representative of your hospital. I have been around a lot of ER rooms during my time, and Dr. Paz is what every doctor should be. He cares, and he LISTENS. He puts you at ease. I feel great that he is my doctor. As a retired police captain, I've seen good and poor bed side manners from doctors. Dr. Paz is solid."
Sep 20, 2025
5.0
"Spectacular"
Sep 20, 2025
5.0
"Very professional"
Sep 20, 2025
5.0
"I felt very appreciated by all the staff, and I would gladly recommend Dr Ivan B Paz and all his staff"
Sep 20, 2025
5.0
"For the great experience I had with Dr. Isaac B Paz I would gladly recommend to family and friends, so that they are attended to of very high quality on my part I am very happy with their professionalism"
Sep 12, 2025
5.0
"Excellent"
Sep 12, 2025
5.0
"Excellent experience ."
Sep 8, 2025
5.0
"Dr. Paz is possibly one of the BEST doctors I've ever had. I feel extremely cared for and put my full faith and trust in his diagnosis and treatment plan for me. He has the best bedside manner I've ever seen in my life."
Sep 4, 2025
5.0
"Thank you"
Sep 4, 2025
5.0
"Thank you"
Aug 28, 2025
5.0
"Excellent , outstandfing Dr."
Aug 24, 2025
5.0
"Dr. Paz is exceptional"
Aug 24, 2025
5.0
"Dr paz is the best!"
Aug 20, 2025
5.0
"I am so incredibly grateful I was blessed with Dr. Paz and his medical team. In a very difficult and uncertain time I have felt confident in his care and am proud to say he is my Doctor"
Aug 17, 2025
4.7
"Excellent"
Aug 17, 2025
4.7
"Excellent"
Aug 16, 2025
4.7
"I think Dr. Paz is an excellent surgeon and did a wonderful job on my lumpectomy."
Aug 15, 2025
5.0
"Very well"
Aug 15, 2025
5.0
"I would definitely recommend them"
Aug 11, 2025
5.0
"Dr. Paz did an excellent job of explaining my condition and what the next steps would be."
Aug 10, 2025
5.0
"We really liked the doctor."
Aug 9, 2025
5.0
"Dr Paz is absolute stellar! He has always taken the steps necessary to care for me. He is outstanding. Best surgeon and excellent communication skills."
Aug 8, 2025
5.0
"Excellent professional Dr Paz is gladly recommended"
Aug 1, 2025
5.0
"I tell everyone that if you have cancer get to the city of hope"
Aug 1, 2025
5.0
"Dr Paz is better than just very good. He's the best surgeon l have ever had!"
Aug 1, 2025
5.0
"Dr Paz is just a great physician"
Jul 28, 2025
5.0
"Dr. Paz has been my doctor for 16 years and he hasn't changed. He has the same best bed side manner and attention as then. Thank you Dr. Paz for being such an amazing doctor."
Jul 27, 2025
5.0
"The personal best because explain the steps"
Jul 27, 2025
5.0
"My experience with the city hope is great."
Jul 21, 2025
3.8
"The only complaint I have is that the doctor leaves without a good bye or further instructions. I am left confused if I should wait for a nurse or just get dressed and leave."
Jul 19, 2025
3.8
"Knows exactly what is happening with my other doctors. That's GREAT!!"
Jul 12, 2025
3.8
"Muy buena"
Jul 12, 2025
3.8
"Muy bueno"
Jul 12, 2025
3.8
"My buena de Exlencia"
Jul 11, 2025
5.0
"Dr Paz is a gift. He's a marvelous surgeon and a humble and caring human. 15 minutes in a room with him is the best medicine."
Jun 30, 2025
5.0
"Dr. Paz is just the best."
Jun 25, 2025
5.0
"All good experience"
Jun 25, 2025
5.0
"Good"
Jun 25, 2025
5.0
"Good"
Jun 23, 2025
5.0
"It was my initial consultation with Dr. Paz that I was probably apprehensive so he started to make me relax by asking about me and my family that I became relax and forget about my health concern. His explanation about my condition and what the plan is and what to do next makes me less worried. His drawing was very easy to understand even if I dont have medical knowledge."
Jun 21, 2025
5.0
"Dr. Paz worked me into his schedule within one day."