We're unable to sign you in at this time. Please try again in a few minutes.
We were able to sign you in, but your subscription(s) could not be found. Please try again in a few minutes.
There may be a problem with your account. Please contact the AMA Service Center to resolve this issue.
Contact the AMA Service Center:
Telephone: 1 (800) 262-2350 or 1 (312) 670-7827  *   Email: subscriptions@jamanetwork.com
Error Message ......

Innovations in Radiation Therapy

Walter D. Rider, MB
JAMA. 1974;227(2):183-184. doi:10.1001/jama.1974.03230150035010.
Text Size: A A A
Published online


Pearson17 has shown that radiation is the best method of treatment for esophageal cancer; even so, only 20% of his patients treated on a radical basis survived five years. His results are even more remarkable when one considers that these patients were surgical rejects; however, their disease was not so advanced as to be suitable for palliative treatment only. Few, if any, comparable results have been achieved by other radiotherapists, and no surgical series comes near to these results.

It is important to ask why Pearson could achieve such outstanding results. A critical review of the experience at Toronto20 suggests the following conclusions:

  1. A Supervoltage is essential. While cobalt 60 is probably adequate, it is certainly the minimal energy level to give. X-rays of 20 to 25 mev are undoubtedly better for two reasons: they deliver better depth dose and consequently spare more lung tissue; they are affected


Sign in

Purchase Options

• Buy this article
• Subscribe to the journal
• Rent this article ?




Also Meets CME requirements for:
Browse CME for all U.S. States
Accreditation Information
The American Medical Association is accredited by the Accreditation Council for Continuing Medical Education to provide continuing medical education for physicians. The AMA designates this journal-based CME activity for a maximum of 1 AMA PRA Category 1 CreditTM per course. Physicians should claim only the credit commensurate with the extent of their participation in the activity. Physicians who complete the CME course and score at least 80% correct on the quiz are eligible for AMA PRA Category 1 CreditTM.
Note: You must get at least of the answers correct to pass this quiz.
Please click the checkbox indicating that you have read the full article in order to submit your answers.
Your answers have been saved for later.
You have not filled in all the answers to complete this quiz
The following questions were not answered:
Sorry, you have unsuccessfully completed this CME quiz with a score of
The following questions were not answered correctly:
Commitment to Change (optional):
Indicate what change(s) you will implement in your practice, if any, based on this CME course.
Your quiz results:
The filled radio buttons indicate your responses. The preferred responses are highlighted
For CME Course: A Proposed Model for Initial Assessment and Management of Acute Heart Failure Syndromes
Indicate what changes(s) you will implement in your practice, if any, based on this CME course.


Some tools below are only available to our subscribers or users with an online account.

0 Citations

Sign in

Purchase Options

• Buy this article
• Subscribe to the journal
• Rent this article ?

Related Content

Customize your page view by dragging & repositioning the boxes below.