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Test ID: 83365    
Desmoplastic Small Round Cell Tumor (DSRCT) by Reverse Transcriptase PCR (RT-PCR), Paraffin

Method Description Describes how the test is performed and provides a method-specific reference

The paraffin-embedded tissue is deparaffinized, lysed, and digested. RNA is extracted using either the TRIzol kit (Invitrogen) or High Pure FFPE RNA Micro kit (Roche). DNase digestion is performed. RNA is converted to cDNA via reverse transcription (RT); the cDNA is amplified via PCR. Primers specific for the desmoplastic small-round-cell tumor EWSR1-WT1 transcript are used. Controls are run with each specimen to assess possible contamination issues and overall test performance. The PCR products are separated by gel electrophoresis and stained with ethidium bromide. The agarose gel is viewed under ultraviolet light and photographed to document the results. In some cases, the specimen is further analyzed by FISH and sequencing.(Jin L, Majerus J, Oliveira A, et al: Detection of fusion gene transcripts in fresh-frozen and formalin-fixed paraffin-embedded tissue sections of soft tissue sarcomas after laser capture microdissection and RT-PCR. Diagn Mol Pathol 2003;12:224-230)

Day(s) and Time(s) Test Performed Outlines the days and times the test is performed. This field reflects the day and time the sample must be in the testing laboratory to begin the testing process and includes any specimen preparation and processing time required before the test is performed. Some tests are listed as continuously performed, which means assays are performed several times during the day.

Monday through Friday; 8 a.m.–5 p.m.

Analytic Time Defines the amount of time it takes the laboratory to setup and perform the test. This is defined in number of days. The shortest interval of time expressed is "same day/1 day," which means the results may be available the same day that the sample is received in the testing laboratory. One day means results are available 1 day after the sample is received in the laboratory.

3 days

Maximum Laboratory Time Defines the maximum time from specimen receipt at Mayo Medical Laboratories until the release of the test result

8 days

Specimen Retention Time Outlines the length of time after testing that a specimen is kept in the laboratory before it is discarded

1 week/7 days

Performing Laboratory Location The location of the laboratory that performs the test

Rochester