DNA ploidy and c-Kit mutation in gastrointestinal stromal tumors.
OBJECTIVE
To investigate the prognostic significance of c-Kit gene mutation and DNA ploidy in gastrointestinal stromal tumors (GISTs).


METHODS
A total of 55 cases of GISTs were studied for the expression of c-Kit by immunohistochemistry, and the c-Kit gene mutations in exons 9, 11, 13, and 17 were detected by polymerase chain reaction-single strand confirmation polymarphism (PCR-SSCP) and denaturing high performance liquid chromatography (D-HPLC) techniques. DNA ploidy was determined by flow cytometry.


RESULTS
Of the 55 cases of GISTs, 53 cases (96.4%) expressed c-Kit protein. The c-Kit gene mutations of exons 11 and 9 were found in 30 (54.5%) and 7 cases (12.7%), respectively. No mutations were found in exons 13 and 17. DNA aneuploidy was seen in 10 cases (18.2%). The c-Kit mutation positive GISTs were larger in size than the negative GISTs. The aneuploidy tumors were statistically associated with large size, high mitotic counts, high risk groups, high cellularity and severe nuclear atypia, and epithelioid type. There was a tendency that c-Kit mutations were more frequently found in aneuploidy GISTs.


CONCLUSIONS
DNA aneuploidy and c-Kit mutations can be considered as prognostic factors in GISTs.
Lee
Ju Han
JH
Department of Pathology, Medical College, Korea University, Seoul, Korea.
Zhang
Xianglan
X
Jung
Woon Yong
WY
Chae
Yang Seok
YS
Park
Jong Jae
JJ
Kim
Insun
I
D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D000782:Aneuploidy; D014408:Biomarkers, Tumor / Q000235:genetics* / Q000378:metabolism; D005260:Female; D005770:Gastrointestinal Neoplasms / Q000453:epidemiology / Q000235:genetics* / Q000473:pathology; D046152:Gastrointestinal Stromal Tumors / Q000453:epidemiology / Q000235:genetics* / Q000556:secondary; D015972:Gene Expression Regulation, Neoplastic; D006801:Humans; D007150:Immunohistochemistry; D008297:Male; D008875:Middle Aged; D009154:Mutation; D011003:Ploidies; D011379:Prognosis; D019009:Proto-Oncogene Proteins c-kit / Q000235:genetics* / Q000378:metabolism; D012307:Risk Factors
D014408:Biomarkers, Tumor; D019009:Proto-Oncogene Proteins c-kit