2002-2003 House Officer at Ain Shams University Hospitals.

2003-2007 Resident at Clinical and Radiation Oncology and Nuclear Medicine Department, Ain Shams University Hospitals.
2004 Three months training at the National Cancer Institute (NCI)
2004-2005 Clinical Oncology Resident at Ain Shams specialized hospitals.
2008-2009 Clinical Oncology Specialist at Zaied Specialized Hospital.
2008-2010 Clinical oncology and Radiation oncology Specialist at the Cairo
International Medical Center (IMC).
2006-2010 Clinical Oncology Specialist at El-Gomhoria Hospital,
Cairo,Egypt.
2006-2008 Clinical Oncology Specialist at Electricity hospital, Cairo, Egypt.
2006-2008 Clinical Oncology Specialist at Sohag Cancer Institute, Sohag,
Egypt.
2007-2010 Clinical Oncology Specialist at Al Doah Hospital.
2009-2010 Fellow Assistant Lecturer of Clinical and Radiation Oncology
"Ahmed Maher Teaching Hospital".
2011 Clinical Oncology Consultant at El-Gomhoria Hospital (till now).
2011 Clinical Oncology Consultant at Al-Doah Hospital (till now).
201-2017 Fellow Lecturer of Clinical Oncology at Ahmad Maher Teaching
Hospital.
2011 Clinical Oncology Consultant at Department of Clinical and
Radiation Oncology of the International Medical Center (IMC)
(till now).

2016 Assistant Manager of Ahmed Maher Teaching Hospital.
2016 Head of Oncology Department Eldoah Hospital (till now).
2017 Lecturer of Clinical Oncology and Nuclear Medicine, Faculty of Medicine, Helwan University (till now).
2019 Clinical Oncology Consultant EL Mokatam Health insurance Hospital (till now).
2019 Clinical Oncology Consultant at Arab Organization for Industrialization (till now).
2019 Clinical Oncology Consultant at Specialized Air forces Hospital (till Now).
2021 Clinical Oncology consultant at El Maadi Armed Forces hospital (till Now).
2021 Member of Multidisciplinary Team for Women Health at Elgalaa Teaching Hospital.
2021 Member of the MDT in ELkoba Health insurance clinic (till now).
2022 Clinical Oncology Consultant at Petroleum Hospital (till now).

Scientific Activities and publications:
A Clinicopathological Analysis of Primary Gastric Lymphoma December 2012, DOI: 10.21608/mjam.2012.16786 Laila Fares, Manal Moawed Abdelwahab, Walid Bayomy, Haytham Abdelkader 18FDG-PET/CT versus Contrast Enhanced CT in Detection of Loco-Regional
Breast Cancer Recurrence.

Alnouby A, Ali I, Nasr I, Rezk M, Elwan A, Abdelkader H.
Egyptian J. Nucl. Med., Vol. 15, No. 2, December 2017, 46.

COVID-19 in Egypt: Through crisis to adaptation; a gastroenterologist’s perspective.
Authors: Mohamed El Kassas , Haytham Abdelkader , Mohammed A. Medhat.
Arab Journal of Gastroenterology Volume 21, Issue 3, September 2020, Pages 207-210.

Radiotherapy to the Left Breast with 3DCRT, IMRT or VMAT: International Medical Center Experience.
Hany S. Attallah1, Radwa M. Hamed, Haytham A. Abdelkader, Mahmoud M.
Abdallah, Aliaa Mahmoud, Ibraheem Haggag, Bassam E. Makram, Ahmed M. El-Saeed.
Journal of Cancer Therapy, 2021, 12, 107-115 https://www.scirp.org/journal/jct ISSN Online: 2151-1942 ISSN Print: 2151-1934.
Tailored treatment strategies for cancer patients during COVID-19 pandemic:

Haytham Abdelkader1, Mohamed El-Kassas2
Reports of Practical Oncology and Radiotherapy 2022, Volume 27, Number 2, pages: 318–330 DOI: 10.5603/RPOR.a2022.0024.

Impact of the COVID-19 Pandemic on Breast Cancer Stage at Diagnosis in a Tertiary Referral Cancer Center in Egypt:
Sobeih ME1 , Gening S2 Abdelkader H3 , Shaaban SM4 SECI Oncology 2023(3):188-193

FIVE-YEAR SURVIVAL ANALYSIS OF SURGICALLY RESECTED GASTRIC CANCER CASES AT NATIONAL CANCER INSTITUTE, CAIRO UNIVERSITY Sayed Shaker Shaeir 1* , Fouad Abdelshaheed1 , Mahmoud Hussein 1 , Mohamed Emam
Sobeih 2 , Dalia Negm 3 , Sara Mamdoh 4 , Mostafa Ahmed Hussein 5 , Haytham Abdelkader6 , Alaadin Hussien 1.
European Chemical Bulletin, ISSN 2063-5346