Dr. Dirbas is originally from Brooklyn, NY. He graduated from Stanford University with a B.S. with Departmental Honors in Chemistry in 1981. While in college, Dr. Dirbas worked as a lab tech in Norman Shumway's transplant laboratory during the initial studies of cyclosporin A as an immunosuppressive agent in preclinical studies for heart/lung transplanation. He then completed his M.D. training with A.O.A honors at Columbia University's College of Physician and Surgeons (now the Vagelos School of Medicine). Dr. Dirbas received the Whipple Award as the top surgery student in his medical school class. Internship and residency then followed at Stanford Hospital (now Stanford Health Care). During his professional development years Dr. Dirbas spent two years at the National Institutes of Health during which time he studied immunospression for cardiac transplantion with Dr. Thomas Waldmann by performing heterotopic heart transplants in cynomologous monkeys then treating them with Anti-tac conjugated to Yttrium90. Dr. Dirbas returned to Stanford and in the later years of his residency became more interested in surgical oncology as he finished his chief resident year the completed a 2 year surgical oncology fellowthip with Dr. John Niederhuber who later served as the head of the NCI. After completing his surgical oncology fellowship, Dr. Dirbas worked as a staff surgeon at the Palo Alto VA Hospital and at Stanford for 4 years. During this period, he served as a surgical oncologist and ICU/critical care attending at the Palo Alto VA while also serving as a breast cancer surgeon and trauma surgeon at Stanford Hospital (during which time Stanford achieved recognition as a Level I Trauma Center). In these early years at Stanford Dr. Dirbas routinely contributed tumor tissue to the pioneering work in the Brown/Botstein labs which led to the initial reports of molecular profiling for breast cancer. Dr. Dirbas became an assistant professor in 1999. He initiated and served as PI for Stanford's Phase I/II studies in accelerated, partial breast irradiation, including intraoperative radiotherapy (IORT) making Stanford an early adopter of this technology. From 2010 to 2017 Dr. Dirbas served as the physician leaders of Stanford's Breast Cancer Clinical Care Program: in 2017 an anonymous Medscape poll ranked Stanford in a tie for #7 as the place that Medscape members would most likely recommend for breast cancer care. During this period Dr. Dirbas contributed significantly to the development of Stanford's Women's Cancer Center, Stanford's South Bay Cancer Center, and design elements of Stanford Cancer Hospital. Dr. Dirbas took a partial sabbatical from 2019 to 2021 to devote a portion of his time to renew research programs. He is currently a Co-investigator on Dr. Aaron Newman's NIH R01 grant studying breast cancer stem cells in the triple negative lineage. After created a broad, interdisciplinary team Dr. Dirbas initiated Stanford's research program investigating the merits of FLASH radiotherapy for breast cancer. Dr. Dirbas received a pilot grant from tne Stanford Cancer Institute for this, and more recently received a 2-year grant from tthe California Breast Cancer Research Program. Dr.Dirbas is also the PI on a research agreement between Stanford and Beyond Cancer to develop a Phase II study for use of ultra high concentration gaseous nitric oxide for treatment of solid tumors. Dr. Dirbas also serves in a consulting role with Beyond Cancer as chair of their scientific advisory board. Dr. Dirbas is a board member of the School of Oncoplastic Surgery. Dr. Dirbas continues to maintain an active breast surgery practice at the Stanford Cancer Center/Stanford Hospital/Stanford Health Care with the unique background training in cardiovascular surgery, trauma surgery, ICU/critical care, and surgical oncology,

Professional Summary

Education & Certifications
  • Residency: Stanford University Dept of General Surgery (1992) CA
  • Fellowship: Stanford University Dept of Surgery (1994) CA
  • Fellowship: National Institute of Health (1989) MD
  • Medical Education: Columbia University Office of the Registrar (1985) NY
  • Board Certification: American Board of Surgery, General Surgery (1994)
  • MD, Columbia University College of Physicians and Surgeons (1985)
  • BS with Honors, Stanford University, Chemistry (1981)

Awards & Memberships
  • America's Top Oncologists, Consumers' Research Council of America (2009)
  • America's Top Surgeons, Consumers' Research Council of America (2010)
  • Best Doctors in America, Best Doctors, Inc (2012)
  • Best Doctors in America, Best Doctors, Inc (2017)
  • Best Doctors in America, Best Doctors, Inc (2018)
  • Best Doctors in America, Best Doctors, Inc (2019)
  • Best Doctors in America, Best Doctors, Inc (2021)
  • Best Doctors in America, Best Doctors, Inc. (2009)
  • Best Doctors in America, Best Doctors, Inc. (2010)
  • Best Doctors in America, Best Doctors, Inc. (2011)
  • Best Doctors in America, Best Doctors, Inc. (2013)
  • Best Doctors in America, Best Doctors, Inc. (2014)
  • Best Doctors in America, Best Doctors, Inc. (2015)
  • Best Doctors in America, Best Doctors, Inc. (2016)
  • Best Doctors in America, Best Doctors, Inc. (2020)
  • Best Doctors in America, Best Doctors, Inc. (2022)
  • Best Doctors in America, Best Doctors, Inc. (2023)
  • Grant Recipient, Vadasz Foundation (2004)
  • IORT for Breast Cancer (, NBC (2004)
  • Star Caregiver Award, Silicon Valley Wellness Foundation (2008)
  • Top Doctors, Castle Connolly (2017)
  • Top Doctors, Castle Connolly (2018)
  • Top Doctors, Castle Connolly (2020)
  • Top Doctors, Castle Connolly (2021)
  • Top Doctors, Castle Connolly (2022)
  • Top Doctors, Castle Connolly (2023)
  • Top Doctors, Catle Connolly (2019)

Administrative Appointments
  • Co-Chair, Tissue Committee, Stanford Health Care (2019 - Present)
  • Co-Leader, Breast Cancer Clinical Research Group, Stanford Cancer Center, Stanford University School of Medicine, Stanford Hospital (2011 - 2015)
  • Director, Clinical Care Sub-team, Breast Disease Management Group, Stanford Cancer Center (2006 - 2010)
  • Physician Leader, Breast Cancer Clinical Care Program (CCP), Stanford Cancer Center, Stanford University School of Medicine, Stanford Hospital (2010 - 2017)


Clinical Trials

Clinical trials are research studies that evaluate a new medical approach, device, drug, or other treatment. As a Stanford Health Care patient, you may have access to the latest, advanced clinical trials.

Open trials refer to studies currently accepting participants. Closed trials are not currently enrolling, but may open in the future.

Practice Locations

Stanford Women's Cancer Center Palo Alto, CA
Palo Alto, CA

900 Blake Wilbur Drive, 1st Floor

Palo Alto , CA 94304

(650) 498-6000

Make An Appointment More Clinic Information » Getting Here »

Breast Cancer Program in Palo Alto Palo Alto, CA
Palo Alto, CA

900 Blake Wilbur Drive, 1st Floor

Palo Alto , CA 94304

(650) 498-6000

Make An Appointment More Clinic Information » Getting Here »

Patient Ratings

(110 Ratings)

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Patient Reviews

(200 reviews)

Dr. Dirbas is a Super & outstanding & professional. The very best care & performance!
Hard to get an answer from this Doc either thru phone or thru my health . Even the entire team is very slow in responding and getting the attention needed for a patient
Excellent care and very nice man
Very detailed and proactive about sharing information.
He is very thorough
My entire family has been his patient and we have been fortunate to have him caring for us for the past two decades. Dr. Dibas is a superstar doctor for breast cancer patients, with not only the most advanced treatment knowledge, but also the most skilled surgery. In addition to taking care of the physical and mental problems of his patients, he also improves the quality of life of his patients. Before my friends plan any breast surgery, I always ask them to see him and he can give them great advice and solutions. You can completely trust him without worry or regret later because he will provide you the best treatment. I am grateful to have him in my life when I was most depressed. Many thanks to Dr. Dirbas and his wonderful professional medical team.
The best of everything
He is very concern of my Lt breast surgery & efficient his opinion & kindness explained.
A fine and companionate doctor.
Answered questions thoroughly and gave honest feedback
Dr Dirbas explain all the details regarding my up coming surgery.
The appointment was much later than scheduled. Fortunately I was able to skip/reschedule meetings and wait. Ii appreciate meeting Dr Dirbas and feel confident in his skills and ability to help me.
Dr Dirbas answered all my questions in detail.
Direct and cordial.
Kind, very clear, easy to understand and thorough.
I know Dr. Dirbas must be on high demand that’s why it kept me waiting for so long, but he is great. Maybe the planning and scheduling can work better in the future
I always enjoy talking with my doctor in Stanford.
Dr Dirbas answered my questions and didn’t rush me. He was very kind and listened to my concerns
Dr. Dirbus is a wonderful physician. This trip though I had to wait an hour and a half for my appointment. I would like to see a little less wait time.
The doctors and the nurses are amazing!! I always refer people to Stanford!
Dr. Frederick is an amazing doctor he really cares about he’s patience , I will highly recommend him to all that need him . I feel so safe and good that he is my doctor.
Most amazing Dr and I am so fortunate to have him on my team. He is so comforting and down to earth. Makes me feel like he has been my Dr for years but in reality only for 3 months. Very calming and talks to you like a person and not a number.
So grateful I GET to see Dr Dirbas!!
Dr. Dirbas speaks clearly and professionally with a caring nature. He is very thorough in his discussion. Thank you.
Dr Dirbas is an excellent surgeon and shows forth compassion
I found the Doctor to be very knowledgeable and gave me very good information in looking ahead at surgery for my cancer.
As always, he provided excellent care and advice.
I appreciate his being informative and answering questions. Not all practitioners bother with that.
Staff was amazing and kind. Really liked the Doctor.
He took the time to answer my questions. I never felt rushed.
Dr Dirbas was very patient to listen to my concerns and explained all in detail and clarity. ,
I am very pleased with my doctors and their level of care and expertise
Everything went very smoothly
I felt comfortable and had all my questions answered.
Excellent Doctor and communicator.
Always treated like you are a VIP
Dr. Dirbas was extremely caring and wonderful in his knowledge of breast cancer.
I feel he is a great surgeon.
I think he is an excellent surgeon, I think the staff was just sloppy today.
Excellent care makes a stressful wait for a prognosis tolerable.
He was very helpful, and friendly
Very friendly, caring and knowledgeable!
Dr. Dirbas is an excellent doctor! He listens & explains options well. I am glad to have him involved in my care.
Dr. Dirbas & the fellow were beyond my expectations!
Dr. Dirbas is knowledgeable & listens carefully. He is personable & makes me feel comfortable. I am lucky to have him as my doctor!
Dr. Dirbas is the best!
Dr. Dirbas consistently shows compassion for families taking care of elderly, frail patients & doing whatever he can to ease the burden and cut out the logistical headaches that frail senior patients would otherwise have to endure.
Great physician & well informed.
Dr. Dirbas evaluates a patients case thoroughly and will order additional testing if needed. Dr. Dirbas takes his time to listen and answer all of a patients concerns.
Excellent physician/surgeon - thoughtful, caring...
Dr. Dirbas is a very knowledgeable and friendly physician. He was patient to answer all my questions and did a thorough evaluation of me. I would highly recommend Dr. Dirbas to others.
I can't even describe how wonderful Dr. Dirbas is - he saved my life.
Great surgeon.
Total confidence in him & have recommended him many time. Both skilled & caring.
Dr. Dirbas has a quiet way of delivering news and alleviating concerns. I like him a lot.
Really listened to me and accommodated by request for a less invasive procedure.
He had someone else do most of the exam, but I was there to see him specifically.
One of the best doctors I've encountered - very smart, thoughtful, kind, straightforward.
Dr. Bas is very respectful and understanding. He has always answered my questions and been helpful in every way.
Maybe the care provider is very busy. I sent messages via MyHealth and got no response back.
Dr. Dirbas is superb.
I can recommend Dr. Dirbas to my friend & relatives. He is a good doctor. He answered all my question about my health. He explained to me about my health.
Time spent w/patient over & above any expectation!! Very thorough. Very caring.
Exceptional doctor!!!
I was "allotted" 15 mins. for a first visit I was prepared. Since my time was short and this was a very important 2nd opinion I had several ques. Twice during my visit he responded with "I'm not gonna argue w/you" I was in no way argumentative, extremely concern. I felt he was very dismissive like I was wasting his time.
Dr. Dirbas is absolutely the BEST!!!
Friendliness & courtesy nurses & staff cannot be better. Doctors & assistants are the best.
Everyone was very nice & helpful. I continue to be impressed with the care I am receiving.
What's higher than "very good"? That's what Dr. D. is!
I have the respect for Dr. Dirbas. He is friendly, kind, and thorough. I always feel much confidence in his expertise and skill.
He is great in medicine - helped me to heal completely.
Went above & beyond!
He is busy but very skilled.
An excellent doctor kind who dedicates his time to his patient.
Very good.
Of course. I recommend people.
Dr. Dirbas "always" goes way out of his way to show care and concern. He has provided a lumpectomy & a biopsy for me. Also solved a blood clot issue immediately in a different department.
I have recommended Dr. Dirbas and Stanford Breast Oncology to friends and co-workers.
Dr. Derbas is always very courteous. He always answers my questions and makes sure I understand everything we discuss.
I like Dr. Dirbas, he was very good in explaining things and accommodating my request.
Dr. Dirbas is an excellent doctor. I always fee; listened to cared for.. He get's straight to the point and tries to find the solution to my problem.
The oncologist - Dr. Masserwas & and the surgeon - Dr. Dirbas were outstanding!!
Dr. Durbis is the best Dr. I have ever had.
All service is great.
Dr. Dirbas & all that work in the office are always professional & courteous.
Dr. Dirbas has a difficult job communicating unwanted information about a cancer diagnosis. He is very measured & direct.
Dr. Dirbas is a peach. Recommend to everyone. Outstanding in all regards.
Great experience, they provided information and answered questions. Although it would have been helpful to get summary on paper since it was a lot of information.
Dr. Dirbas was thorough and very understanding during our appointment. His follow up was excellent - far exceeded my expectations.
Dr. Dirbas was informative supportive and showed a great deal of concerns during my treatment time.
Dr. Dirbas is great!
He really didn't seem to care very much. Low energy - little warmth. I was really surprised as I had high expectations.
Dr. Dirbas is the best doctor in the world! This year was our 20th year together as a team!
Dr. Dirbas & his team are amazing! Dr. Dirbas himself is an incredible dr.! A perfectionist & an outstanding surgeon. He truly cares about his patients & it shows in his work & office visits!
I had seen Dr. Dirbas before. He is a physician who listens & pays attention to the patient, explains things clearly & shows concern & I think he is an excellent doctor whom I trust.
I am 8 years out of treatment - so am not in an anxious - need phase. This is purely follow-up.
Dr. Dirbas is excellent!
I have had only excellent care from Dr. Dirbas - he takes the time to answer all my questions & concerns. He is very compassionate.
Dr. Dirbas is excellent!
Such an honor to be patient of Dr. Dirbas & Dr. Nazerali & their staffs. So excited they are a part of my care tm.
Dr. Dirbas is outstanding!
Absolutely outstanding - Clear & comprehensive explanations. Professional, thorough, efficient & kind.
The 2 doctors & 2 nurse were very patience & very knowledgeable & made me feel very comfortable.
I have been patient of Dr. Dirbas for 10 years. He is wonderful - excellent person and doctor. I appreciate his care and being in the study I am in. I recommend Dr. Dirbas all the time.
Dr. Dirbas is the best provider I have ever seen, hands down. Extremely kind, respectful and intelligent. Everyone who has "rounded" with him has also been respectful & helpful.
Dr. Dirbas is awesome.
Dr. Dirbas is top notch!
He detected what might have been a problem in the other breast & dealt with it immediately. It turned out ok. The further tests were all done on that day!! Great! I am from out of town.
Doctor Dirtas, his assistant Rebecca and a couple of others did outstanding!
My time with Dr. Dirbas was quite productive. This was the first visit and there are a lot of decisions still to be made on my part. So some questions didn't fully apply.
Very warm and sincere attitude.
Dr. Dirbas is the most awesome surgeon! No wonder he leads the pack!
Dr. Dirbas is top notch, wonderful.
Dr. Dirbas was, as always, thorough, professional & compassionate. He cares for me as person, not a "case." That makes a huge difference. He would always be my breast oncology surgeon of choice.
Dr. Dirbas was very reassuring about the procedure and follow-up.
Dr. Momeni on my 1st contact with him took significant unhurried time to explain the procedure recommended. EXCELLENT.
Dr. Dirbas - "best".
Very busy dr. - Hard to recommend because he is so busy.
All my needs & interest were taken care of.
Dr. Dirbas and his staff are outstanding! Well worth any waiting time.
Felt like I am getting the best care possible.
Dr. Fred Dirbas is very compassionate and skilled physician. I have great confidence in him.
I have been with Dr. Dirbas for 10 years and he has consistently been the most caring and competent doctor I have had. I'm very priviledged to be in his care.
Extremely kind, respectful, helpful, professional.
Dr. Dirbas is always thoughtful, competent & caring.
Dr. Dirbas rocks!!!
Dr. Dirbas is fabulous.
Dr. Dirbas is wonderful. He went over all of my issues.
Great effort.
I did not feel rushed in or rushed out. My experience was very comforting.
Dr. Dirbas is an excellent care provider.
Dr. Dirbas is caring and very good about responding to questions/emails etc. He's willing to go above & beyond what I have experienced elsewhere.
Dr. Dirbas is the most considerate, caring, respectful doctor I have ever met. His cancer center reflects his sincerity and high professional standards. He is able to engage in authentic discussion - so refreshing.
I trust Dr. Dirbas to make wise decisions concerning my health. If I don't know what to do, he can decide.
Dr. Dirbas is the most outstanding surgeon/physician I've encountered, and I'm most grateful for his care & skills.
Dr. Dirbas is simply THE BEST. He is a caring and insightful person, skilled practitioner and clear communicator. I've always found him to be approachable, and patient. Upon being told that I did not now, or ever, want reconstruction, and that I wanted to avoid having "breasts under my arms" instead of on my chest after my bilateral mastectomy, he suggested bringing Dr. Nguyen in to close and do some liposuction. It was a brilliant plan and I'm delighted with their combined skills. I'll happily wear their handiwork for the rest of my life. Cancer Free !!!
I feel so very fortunate to have Dr. Dirbas as my oncology surgeon. He is brilliant, talented, empathetic, kind & inspirational.
Dr. Dirbas is kind, caring, addressed our concerns thoughtfully and with academic rigor. Superb physician - he was easy to talk to and he took time to listen - Highly recommend.
I felt respected & treated like a member of my own healthcare team. My questions were answered, and all of my options given in understandable terms.
The care providers, have been great!!!
Excellent doctor!!
Have received excellent standard of care from Dr. Dirbas.
Dr. Sledge & Dr. Dirbas are amazing, professional and the best!!!
Dr. Stockdale is an excellent physician - knowledgeable, thoughtful & caring, supportive. Stanford needs more physicians like him!
Very caring & took the time to discuss & explain my condition, in easy to understand language. I felt extremely comfortable. I felt I was in extremely capable & professional hands.
I have had same doctor for 20 years and have received excellent care and appreciate all his care. Thank you.
I would recommend these care providers with all that I know.
Dr. Dirbas got me in on a semi emergency basis. On his first day after vacation. He is an extremely professional doctor.
For me, inspires confidence, is easy to relate to & feel comfortable.
Good - I trusted his assessment & knowledge. Great attitude & sense of humor. My husband also trust him.
I won't find enough words to thank Dr. Dirbas for being such an awesome surgeon and doctor I am really blessed to be his patient. Dr. Dirbas skillfully saved my breast and my nipple (when other surgeons said they would not be able to). He is also very caring, very professional, and he promptly responds to any concerns or questions. I can't be more grateful.
Dr. Dirbas is an excellent surgeon with a very kind manner. I couldn't be more pleased with my experience with him as a provider.
We simply love Dr. Dirbas.
Dr Dirbas is the best doctor I have ever had. He is caring and compassionate, and gives every patient as much time as she needs. I love Dr Dirbas!
Wonderful care!
I would like to spend a little more time discussing my care and Dr. Dirbas is excellent about listening to my questions and answering them, and giving me good feedback. But I know he's in a hurry to get to his next patient, so it kind of looms over the visit that he needs to move on as soon as possible.
Dr. Dirbas has been and will always be the best of the best doctors that I have ever had and wished for.
Despite of the long wait, we love Dr. Dirbas. He is very good.
Best doctor! His medical skills; modesty responsible; patient and meticulous care and care of patients.
Dr. Dirbas is the best, he is very knowledgeable, polite and makes me feel at ease about my breast cancer. Highly recommended!
Definitely recommending Dr. Dirbas. He is the best!
Dr. Dirbas is the best, already recommended a friend to see him who was recently diagnosed w/cancer.
Dr. Dirbas - ROCKS! He is an awesome doctor and surgeon. I have recommend him to many others.
Dr. Dirbas is very careful to give a message that he cares about my well being. He takes a serious and caring approach to me. He's the best!!
I have a good experience because Dr. Dirbas is very professional and kind. He explained my past surgery result & follow up well involving me in decision follow up option. I have great confidence in his care.
Dr. Dirbas is an outstanding, compassionate and wonderfully skilled physician.
Always recommend Dr. Dirbas to any woman diagnosed with breast cancer.
Dr. Dirbas and his team are awesome! Truly one of the best doctors!
Dirbas is the reason I chose Stanford!
Dr. Dirbas' team is excellent, Dr. Dirbas is great, he's the best!
Wonderful surgeon - caring & very skilled.
The care provided by Doctor Dirbas, Miranda Kramer NP and Anne Barbieri RN was outstanding and comprehensive. Thank You, You are great professionals who exemplify wonderful patient care.
All highest excellence.
I think Dr. Dirbas is EXCELLENT in all respects and I recommend him highly.
Fabulous & very confidence - inspiring experience w/Dr. Dirbas at all levels.
Dr. Dirbas is the finest physician I have ever visited!
The best dr. ever.
Dr. Dirbas & his office personnel are excellent!
Dr. and his staff are friendly and very efficient.
Absolutely excellent.
My husband and I travel 4 hours one way, and stay overnight in the area to be able to have Dr. Dirbus as my doctor. I appreciate having him as my doctor.
Dr. Dirbas is exceptional! He listens with a kind heart, provides thorough information and takes his time even if it's longer than needed - it just shows he truly cares!
Dr. Dirbas is off the charts. There's no words to describe how awesome & great he is!!!
Dr. Dirbas is one of the most caring & smart people I ever met. Thank you!
Very warm, friendly, concerned about my feelings & care.
I just had a fine needle aspiration (FNA) done on my left breast 4 months before my last appointment. It turned out negative. Previous ultrasound also detected nothing of concern. Yet he wanted me to undergo another FNA!
Even though Dr. Dirbas was late due to the emergency surgery, he was courteous & attentive. He was clearly frustrated with lack of communication about why he was late & that he had no backup.
Excellent, attentive & very knowledgeable.
Dr. Dirbas and all his staff have consistently been the most caring, respectful and helpful providers I've EVER seen.
Very good.
He's the best. Seems to be over booked though because he is very attentive to each pt.
I was very fortunate to be under the care of Dr. Dirbas. He is extremely caring and professional. A wonderful doctor and person!!
Dr. Dirbas is the best dr. I have ever seen.
I recommend Stanford & Dr. Dirbas any time cancer comes up in conversations. Dr. Dirbas is an outstanding & excellent surgeon and health care provider. Stanford is lucky to have him, as was I.
The doctor is excellent!

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