High frequency loss of heterozygosity on the long arms of chromosomes 13 and 14 in nasopharyngeal carcinoma in Southern China.
OBJECTIVE
To investigate the loss of heterozygosity (LOH) on chromosomal arms 13q and 14q in nasopharyngeal carcinoma (NPC) using 21 microsatellite polymorphic markers and to study whether there is a correlation between LOH and clinicopathologic parameters and/or Epstein-Barr virus (EBV) infection in NPC.


METHODS
Sixty cases of NPC were studied using polymerase chain reaction based microsatellite analysis with genescan and genotyping techniques.


RESULTS
LOH was detected on 13q in 78% of NPC tumors, high frequency LOH loci (more than 30%) clustered to 13q12.3-q14.3 and 13q32. On chromosome 14q, LOH was detected in 80% of NPC tumors; high frequency LOH loci clustered to 14q11-q13, 14q21-q24 and 14q32. High frequency LOH at 13q31-q32 correlated with a lower level of EBV infection; LOH on chromosome 14q was closely associated with poor differentiation of NPC tumor cells.


CONCLUSIONS
Our results suggest that in NPC, LOH on chromosome 13q and 14q are common genetic events, and putative tumor suppressor genes (TSG) residing in these regions may be involved in tumorigenesis.
Shao
Jianyong
J
Cancer Center, Sun Yat-Sen University of Medical Sciences, Guangzhou 510060, China.
Li
Yuhong
Y
Wu
Qiuliang
Q
Liang
Xiaoman
X
Yu
Xingjuan
X
Huang
Lixi
L
Hou
Jinghui
J
Huang
Xiaoming
X
Ernberg
Ingemar
I
Hu
Li-Fu
LF
Zeng
Yixin
Y
D000328:Adult; D000368:Aged; D002882:Chromosomes, Human, Pair 13 / Q000235:genetics*; D002883:Chromosomes, Human, Pair 14 / Q000235:genetics*; D004273:DNA, Neoplasm / Q000235:genetics; D005260:Female; D005787:Gene Frequency; D006801:Humans; D019656:Loss of Heterozygosity; D008297:Male; D018895:Microsatellite Repeats; D008875:Middle Aged; D009303:Nasopharyngeal Neoplasms / Q000235:genetics* / Q000473:pathology; D013223:Statistics as Topic
D004273:DNA, Neoplasm