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Primary
(redirected from primary radiation)

   Also found in: Dictionary/thesaurus, Medical, Encyclopedia, Wikipedia, Hutchinson 0.02 sec.

PRIMARY. That which is first or principal; as primary evidence, or that evidence which is to be admitted in the first instance, as distinguished from secondary evidence, which is allowed only when primary evidence cannot be had.
     2. A primary obligation is one which is the principal object of the contract; for example, the primary obligation of the seller is to deliver the thing sold, and to transfer the title to it. It is distinguished from the accessory or secondary obligation to pay damages for not doing so. 1 Bouv. Inst. n. 702.


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2) The four criteria are (1) a history of primary radiation for a benign process or a malignancy without osteoblastic activity, (2) the presence of a bony sarcoma arising within the path of the radiation beam, (3) a long asymptomatic period, and (4) the presence of histologically proven osteosarcoma.
If the tumor is deemed unresectable or if resection imposes unacceptable morbidity, primary radiation therapy may be considered as a palliative measure.
Although the number of patients we evaluated is too small for meaningful survival analysis, the fact that only 1 of the 5 patients who had stage II disease or less and who had been treated with primary radiation therapy died of their disease within 5 years suggests that irradiation may be a viable treatment option in early-stage disease.
 
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