| Exam 
opens on June 1, 
2024
 
 
 
 
 
 
 
Rabex table of 
content and 
history 
  
   
  The 
purpose of 
RABEX:
 
The 
Radiation and Cancer 
Biology Practice Examination is to supplement the 
training 
of radiation oncology residents by providing an 
educational resource to help guide residents in the study 
of 
cancer 
and radiation 
biology. It is anticipated that the 
Radiation and Cancer Biology Practice Examination
 will also assist residents and board 
eligible 
radiation 
oncologists in preparation for the 
Radiation and Cancer Biology
 section of 
the cognitive 
exam 
administered by the 
American 
Board of 
Radiology 
(ABR) 
for certification in radiation oncology. 
     Well into its 
second 
decade of existence, RABEX continues to be a unique and 
important educational
tool for the certification and continuous education of 
residents and 
senior radiation oncologists. The
present edition of RABEX 
follows 
the original goals defined in 
the 1990's by Drs. J. D. Chapman, S.
Shahabi, L. R. Coia and B. Corn. However, due to 
the 
increase in knowledge in the field of biology and
the rapid development of electronic distribution of 
information, 
RABEX needed to 
be updated to match
these challenges. The ultimate goal of the present 
edition 
is to 
maintain its level of excellence with
relevant updates in topics and contents.
 
     
The topics included in the 
RABEX practice 
examination continue to be 
based upon those listed by
the American Board of Radiology for the 
cognitive 
exam in 
radiation 
and cancer biology. Also, the number
of questions in each section reflects the ABR's relative 
weight for 
each topic. Therefore, this practice
examination provides guidance for residents and senior 
radiation 
oncologists in their preparation for
the initial radiation oncology certification examination 
as 
well as to 
demonstrate cognitive expertise in
radiation biology required for maintenance of 
certification.
 The exam consists 
of 200 multiple 
choice questions in, latest updated ABR 
Guidelines:
 
 
I. 
Interaction 
of 
radiation with matter, 
a. Definition 
of 
ionizing radiation, free radicals, and radical damage, 
b. Direct and indirect 
action 
of radiation, 
 
            
  
              
  
              
  
              
  
 numbers and 
types of DNA lesions, c. Consequences of unrepaired DNA 
DSB
 
 
II. 
Molecular 
and 
cellular damage and repair, a. 
Molecular 
mechanisms of DNA damage, b. Molecular mechanisms of DNA repair, 
c. Cellular 
recovery, 
             
  
              
  
              
  
              
  
          d. 
Chromosome and chromatid damage
 
 
III. 
Cellular 
responses to radiation, 
a. 
Mechanisms of cell 
death, b. 
Cell 
and 
tissue survival assays: measurement of response, c. Models of cell 
survival
 IV. 
Linear energy transfer (LET) and oxygen effect, 
a. Linear energy transfer, b. Oxygen Effect
 
 V. Tumor 
biology and 
microenvironment, a. 
Solid tumor assay 
systems, b. 
Tumor 
microenvironment
 
 VI. Cancer biology, 
a. Cell and 
tissue 
kinetics, b. 
Molecular 
signaling, c. 
Mechanisms of cancer development, d. Cancer genetics/genomics
 
 VII. Radiobiology 
of 
normal 
tissues, a. Clinically relevant 
normal 
tissue responses to radiation, b. Mechanisms of normal tissue radiation 
responses, c. 
Total 
body irradiation
 
 VIII. Dose delivery, a
. Therapeutic 
ratio, 
b. Time, 
dose, 
and 
fractionation, c. 
Brachytherapy, d. 
Radiobiological aspects of different radiation 
modalities
 
 IX. 
Combined 
modality therapy, 
a. 
Chemotherapeutic 
agents 
and radiation therapy, b. Radiosensitizers, bioreductive drugs, 
and 
radioprotectors, c. 
Immune therapeutics,
     
  
              
  
              
  
        d. 
Hyperthermia
 X. Late 
effects 
and radiation 
protection, a. 
Radiation 
carcinogenesis, 
b. Heritable 
effects of 
radiation, c. 
Radiation 
effects in the developing embryo, d. Radiation protection
 
 The answer, along with an 
explanation and 
appropriate references, will 
be provided for each question.
 
 Editor-in-
Chief:
 Marcelo Vazquez, MD, 
PhD
 Loma 
Linda University, Radiation Medicine
 MVazquez@llu.edu
 
 Chief-
Technical Editor:
 Siamak Shahabi, PhD
 Radiation & Cancer Biology Practice 
Examination, 
USARabex 
Organization & Advanced Medical Publishing, Inc., 
USA
 info@rabex.net
 
 
 
Contributors:
 
 
Marcelo 
Vazquez, 
MD, 
PhD, 
Lead, 
Clinical
 Translational Radiobiology Research  Dept. of 
Radiation 
Medicine  Loma 
Linda University Medical Center, CA, 
Alejandro Carabe-Fernandez, PhD, 
Department of 
Radiation Oncology, 
The Hospital of the University of Pennsylvania, 
Philadelphia, 
PA,
 
Erica Bell, PhD, 
Department of 
Radiation Oncology, Associate professor, Radiation 
Biology 
Director, The Ohio State University, Columbus, OH, Manuela 
Buonanno, PhD, 
Columbia University, 
Center for Radiological Research, 
NY, Veljko 
Grilj, 
PhD,
 RARAF, Nevis Laboratoriese, Columbia University, 
NY, 
 Jessica Fleming, 
PhD,
Department
      of 
Radiation Oncology at the Ohio State University
, 
Columbus, 
OH,
 &
 Siamak Shahabi, PhD, Chief-Technical Editor, 
Radiation 
& 
Cancer Biology Practice Examination, Rabex 
Organization & Advanced Medical Publishing, Inc., 
Proton 
Therapy, and 
Cancer-Matrix Manual, USA. 
 
 
Past 
Contributors:
 1995-present 
J. D. Chapman, PhD
, 
Editor-in-Chief 
 Associate 
Editors: 
 
Gary 
Y. 
Yang, 
Kathryn Huber, MD, PhD, Mark Ritter, MD, PhD, Richard 
Miller, PhD, 
Minesh Mehta, MD, Joan
 Allalunis-Turner, PhD, Paul C. Billings, PhD, David A. 
Boothman, 
PhD, 
J. Martin Brown, PhD, Lawrence R. Coia, MD, William C. 
Dewey, 
PhD, Evan 
B. Douple, PhD, Richard P. Hill, PhD, Clifton C. Ling, 
PhD, 
Luka 
Milas, 
PhD, William F. Morgan, PhD, Colin G. Orton, PhD, Mark A. 
Ritter, 
MD, 
PhD, Sara Rockwell, Barry S. Rosenstein, PhD, 
Joseph L. 
Roti 
Roti, PhD, 
Craig W. Stevens, MD, Beverly A. Teicher, PhD, E. Day 
Werts, PhD, 
& H. Rodney Withers, PhD. 
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