Prof. Hakan Ismail Sari, Hematologist (Istanbul, Turkey) – Experts Medical
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Specialties
Oncology
Doctors
  • RUS
  • UKR
  • ENG
  • KZ
  • ESP
  • FR
telegram
Specialties
Oncology
Doctors
  • RUS
  • UKR
  • ENG
  • KZ
  • ESP
  • FR
telegram
Prof. Hakan Ismail Sari

Prof. Hakan Ismail Sari

Hematologist
5
11 reviews
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Istanbul, Turkey
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Clinical experience: over 27 years
Languages: EnglishTürkçe
Reviews about Prof. Hakan Ismail Sari
Zafer Acar
Verified review
Zafer Acar
Lymphoma
I noticed a small lump under my jaw that gradually grew toward my ear and made it almost impossible to breathe. I went to the esteemed Dr. Hakan İsmail. After the diagnosis of lymphoma, my treatment began immediately, and from the very first session, my swelling started to go down. Thanks to Dr. Hakan İsmail’s treatments, I am currently well. My treatment will hopefully conclude with the procedure recommended by him. I am infinitely grateful to my very valuable Dr. Hakan İsmail and his dear assistant Zehra for their constant support, patience, and care throughout my treatment. I am so glad you exist.

22/11/2025
Seda Gurbuz
Verified review
Seda Gurbuz
Lymphoma
After my spouse was diagnosed with lymphoma, we went through a very difficult period. However, Dr. Hakan İsmail Sarı and his team, especially his assistant Zehra, made this process much easier for us. The most important point was their incredibly fast and accurate action during the diagnosis phase, which allowed treatment to begin without delay. My spouse has completed treatment, and our follow-up checks are clear. This entire process was made possible thanks to the doctor’s meticulous approach, knowledge, care, and human touch. They patiently answered all our questions and reassured us at every concern. Professionally and personally, Dr. Hakan İsmail is an excellent physician who made us feel like part of the family. We are deeply grateful for his dedication and kindness.

12/11/2025
Ömer Yıldıztugay
Verified review
Ömer Yıldıztugay
Stage 4 Lymphoma
Dear Dr. Hakan and Zehra, I literally owe my life to you 🙏🏻. Seven months ago, I was diagnosed with Stage 4 lymphoma, and during my treatment and diagnostic process, I was under your care. Thanks to you, I am now completely free of the disease 🥳. I can never repay you. If anyone has this disease or suspects it, this should definitely be your destination. Dr. Hakan and Zehra will change your life, I am sure 😊🙏🏻.

08/10/2025
İbrahim Kaya
Verified review
İbrahim Kaya
Stomach Cancer
During my stomach cancer journey, I met Hematology specialist Dr. Hakan İsmail, whose knowledge and care provided me great support. Throughout my treatment, he explained every step in detail, patiently answered all my questions, and gave me moral support. I am truly grateful to him. His medical expertise and human approach make him a highly trustworthy doctor. I recommend him to everyone without hesitation.

03/10/2025
Yusuf İslam
Verified review
Yusuf İslam
Chronic Lymphocytic Leukemia
Our 81-year-old grandfather was diagnosed with chronic lymphocytic leukemia. At the state hospital, the doctor recommended starting chemotherapy and warned about side effects, including infection risks and potential ICU admission. This worried us, so we decided to consult a specialized expert. After research, we found Prof. Dr. Hakan İsmail Sarı and immediately booked an appointment. He carefully reviewed all reports and tests and explained that chemotherapy was not necessary. Instead, smart drug therapy could control the disease. He spent about an hour with us, answering all questions patiently and alleviating our concerns. We were very satisfied with his knowledge and experience. I highly recommend consulting him in similar situations.

29/09/2025
Özlem Danacı
Verified review
Özlem Danacı
Acute lymphoblastic leukemia
Dr. İsmail has a crucial quality for a doctor: compassion ❤️. His knowledge, skill, and experience are already top-level, but what made my treatment especially unique was his dedicated attention to my needs, approaching me sensitively and carefully. He always made me feel safe and stayed with me late at night when necessary. I am grateful to my precious Dr. İsmail for being by my side during this difficult journey 🙏🏻. Many thanks also to Zehra, Damla, Ayşenur, Dilan, Hatice, Dilşat, and the wonderful supporting team.

17/07/2025
Nil Goknil
Verified review
Nil Goknil
Myeloma
We had just recently met Dr. Hakan, but from the first moment, his explanations, approach to our questions, friendliness, and close attention made us feel very secure. Assistant Zehra was equally supportive regarding communication and procedures. Many thanks for all your support.

04/07/2025
Ayşe Çağrı Bula
Verified review
Ayşe Çağrı Bula
Anemia associated with chemotherapy
It is difficult to express in words the knowledge, experience, and patient care approach of Dr. Hakan İsmail. We are lucky our paths crossed. Some people leave a mark in life, and Dr. Hakan is one of those special people for us. Special thanks to Zehra for facilitating communication and always providing quick responses and understanding. 🙏

02/06/2025
Esra Çınar
Verified review
Esra Çınar
Malignant blood disease
Dr. Hakan is extremely knowledgeable in his field, keeps up with the latest scientific developments, and can empathize easily with patients. He provided detailed information about my mother’s illness at every stage in a language we could understand. We are grateful for his guidance and support throughout this journey. Special thanks also to the sweet Zehra 😊🙏.

24/05/2025
İlayda Taşkıran
Verified review
İlayda Taşkıran
Lymphoma
My dear doctor ♥️. From the start of my journey on September 18, 2024, he never withheld his support, providing excellent treatment that cured me by March 24, 2025. We started lymphoma treatment based on pathological diagnosis, and Dr. Hakan carefully monitored every detail throughout the process. With Zehra and the team, my treatment went smoothly. I am grateful they exist ♥️.

12/05/2025
Aytug Gumus
Verified review
Aytug Gumus
Leukemia
From the first day of my treatment, Dr. Hakan İsmail carefully managed my diagnosis, follow-up, and treatment, providing detailed information and ensuring a positive outcome. Assistant Zehra’s support allowed me to get help remotely when needed, which was invaluable. He is a highly recommended physician for anyone needing similar treatment. Many thanks to Dr. Hakan and Zehra.

01/05/2025
Hematologist
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Clinical experience: over 27 years

Achievements and awards

Recipient of the Young Researcher Award of the Turkish Society of Hematology (2002, 2004).
Awarded the Best Clinical Study Award by the Turkish Society of Hematology (2003, 2004).
Honored with the Prof. Osman İlhan Apheresis Science Award at the Hemaferez Congress (2009).
Author of more than 150 scientific articles and abstracts published in national and international peer-reviewed journals.
His research on the treatment of chronic GVHD became the basis for the development of a new budesonide formulation by Dr. Falk Pharma.

About Prof. Hakan Ismail Sari

Specialization
  • Internal Medicine.
  • Hematology.
  • Therapeutic Apheresis.
  • Bone Marrow and Stem Cell Transplantation.
  • Treatment of hematologic and hemato-oncologic diseases.
  • Clinical research in apheresis, transplantation, and cellular therapy.
Education
  • 1990–1997 — Hacettepe University (Ankara) — Medical degree
  • 1998–2003 — Erciyes University (Kayseri) — Residency in Internal Medicine
  • 2003–2006 — Erciyes University (Kayseri) — Fellowship in Hematology
  • 2010 — Associate Professor title
  • 2016 — Full Professor title
Clinical Experience
  • 1998–2006 — Erciyes University (Kayseri) — Hematologist; Internal Medicine Specialist
  • 2006–2015 — Pamukkale University, Faculty of Medicine (Denizli) — Hematologist; Deputy Chief Physician; Director of Quality Management
  • Since 2012 — Inspector for the international JACIE quality system in Bone Marrow Transplantation, Apheresis, and Cryopreservation Units
  • 2012–2016 — Founder and Director of the Therapeutic Apheresis Center and the Stem Cell Transplantation Center at Pamukkale University
  • 2015–2016 — Bone Marrow Transplantation Coordinator, Ministry of Health of Turkey; led the establishment of the Stem Cell Transplant Center at Istanbul Training and Research Hospital
  • 2018–present — Memorial Ataşehir Hospital (Istanbul) — Hematologist
Scientific Work and Publications
  • Author and co-author of approximately 150 scientific publications in national and international peer-reviewed journals.
  • Research focuses on apheresis, stem cell transplantation, hematologic oncology, cellular therapies, and management of post-transplant complications.
  • His study on the treatment of chronic graft-versus-host disease (GVHD) was published in the American Journal of Hematology and inspired the development of a new budesonide formulation by Dr. Falk Pharma.
  • Regular participant in international hematology and apheresis congresses and symposiums.
  • Invited speaker at professional medical conferences across Europe and the United States.
  • Editorial Board Member of Transfusion and Apheresis Science.
  • Led scientific projects on standardizing apheresis procedures and optimizing bone marrow transplant processes.
Membership in professional organizations
  • Secretary General, Turkish Apheresis Society (2012–2014).
  • Secretary General, Hematologic Oncology Society (2014–2016).
  • Secretary, Stem Cell Transplantation Scientific Subcommittee of the Turkish Society of Hematology (2010–2014).
  • Board Member, Society of Blood and Bone Marrow Transplantation (2015–2016).
Memorial Atasehir Hospital
The clinic where the doctor practices
Memorial Atasehir Hospital
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Turkey, Istanbul
Published 10.12.2025
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