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 ......
Article |

Researches on the Radiotherapy of Oral Cancer.

AMA Arch Intern Med. 1951;88(1):133. doi:10.1001/archinte.1951.03810070143015.
Text Size: A A A
Published online


Carefully controlled experiments were undertaken in the treatment of oral cancers to compare the effects of gamma rays from a radium beam and x-rays of 185 kv. constant potential. The principal difference noted was in the skin reaction. Skin erythema and mucous membrane reaction developed more rapidly and were severer in the patients treated with x-rays. Other experiments demonstrated the ratio of gamma ray dose to x-ray dose for the same severity of skin reaction was 1.34. A new statistical method was developed by the authors for estimating the proportion of patients cured by the use of the interim clinical results. By these methods, the estimated cure rate was 31 per cent for patients treated with radium beam and 19.2 per cent for those treated by x-ray beam. However, the difference of 11.8 per cent is less than 1.62 times its standard error and cannot be considered significant. Serial biopsies


Sign in

Purchase Options

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

First Page Preview

View Large
First page PDF preview





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.