Study of human leukocyte antigen class I phenotypes in Moroccan patients with nasopharyngeal carcinoma.
Previous reports demonstrated an association between the human leukocyte antigen (HLA) and risk for nasopharyngeal carcinoma (NPC) among the Chinese in Singapore, a population with a high incidence of this malignancy. In our study, we assess the association between HLA and NPC in Morocco, a median-prevalence area for this cancer, where NPC presents the particularity of also affecting young individuals. Using the standard microlympho-cytotoxicity test, we typed a total of 154 Moroccan NPC patients and 257 unrelated healthy controls for their HLA-A and B antigens. The results of these analyses show that the frequencies of HLA-A10, HLA-B13 and HLA-B18 were found to be higher in the NPC group than in the control group, whereas HLA-A9 was associated with a decreased risk. After correction for the number of specificities tested, these differences were statistically significant only for HLA-B18 (corrected p value [pc] < 0.023, relative risk [RR] = 4.14) and HLA-A9 (pc < 0.023, RR = 0.45). The comparison of the distribution of the HLA antigens in younger and older cohorts of patients shows that the incidence of HLA-A10 and HLA- B18 was higher in the older group, whereas the frequencies of HLA-A19 and HLA-B13 were significantly higher in younger patients compared with controls. The presence of both HLA-A19 and HLA-B13 phenotypes correlated with an increased risk of developing NPC among overall patients compared with controls. According to the sex distribution, increased frequency of HLA-B18 was found in male and female NPC patients compared with controls, whereas the frequency of HLA-A10 was higher only in male NPC patients compared with controls.
Dardari
R
R
Institut Pasteur du Maroc, 1 Rue Abou Kacem Ez-Zahraoui, B.P. 120-Casablanca, Morocco.
Khyatti
M
M
Jouhadi
H
H
Benider
A
A
Ettayebi
H
H
Kahlain
A
A
Mansouri
A
A
El Gueddari
B
B
Benslimane
A
A
D000293:Adolescent; D000328:Adult; D017668:Age of Onset; D000368:Aged; D002277:Carcinoma / Q000453:epidemiology / Q000235:genetics*; D016022:Case-Control Studies; D002648:Child; D005260:Female; D005787:Gene Frequency; D020022:Genetic Predisposition to Disease; D015234:HLA-A Antigens / Q000235:genetics; D015235:HLA-B Antigens / Q000235:genetics; D015395:Histocompatibility Antigens Class I / Q000235:genetics*; D006650:Histocompatibility Testing; D006801:Humans; D008297:Male; D008875:Middle Aged; D009018:Morocco; D009303:Nasopharyngeal Neoplasms / Q000453:epidemiology / Q000235:genetics*; D010641:Phenotype; D012737:Sex Factors
D015234:HLA-A Antigens; D015235:HLA-B Antigens; D015395:Histocompatibility Antigens Class I