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Serological markers of hepatitis B virus and alpha-fetoprotein levels preceding primary hepatocellular carcinoma in Alaskan Eskimos.

The availability of stored sera that had been obtained for other investigations permitted examination of the sequential development of hepatitis B virus (HBV) infection markers and alpha-fetoprotein (AFP) in persons who later developed primary hepatocellular carcinoma (PHC). 9 of the 11 PHC subjects had markers of HBV infection. The results showed that HBV infection could have occurred as little as 10 years before the recognition of PHC. Seroconversion from HBeAg to anti-HBe and significant rises of AFP levels occurred as long as 6 years and 2 years, respectively, before clinical onset of PHC. The finding that anti-HBe seems to precede the rise in AFP by several years suggests that in populations with a high incidence of HBV-associated PHC, or in families with high risk of PHC, the best use of AFP screening may be to monitor HBsAg carriers after seroconversion from HBeAg to anti-HBe.

Adolescent↗

An HLA class-II allele frequent in Eskimos and Amerindians is found in the Tyrolean Ice Man.

DNA was extracted from specimens derived from the calcaneus of the Tyrolean Ice Man under sterile conditions in a laboratory, where no DNA extractions and PCR experiments had been performed before. Agarose gel electrophoresis and ethidium bromide staining did not reveal any evidence of genomic DNA in the preparation obtained, indicating a high degree of DNA degradation. Nevertheless, we performed PCR amplifications with this sample using primer pairs specific for HLA class II alleles. HLA-DRB and DQB1 alleles were amplified in a nested PCR approach. In one of the reactions, we observed a distinct amplification product, which we directly sequenced. By comparing the obtained nucleotide sequence with a database of HLA alleles we assigned the HLA-DRB1*1402 type to the amplified sample. None of the investigators involved possesses this allele, indicating that no contamination with modern DNA had occurred. The HLA-DRB1*1402 allele is extremely rare in Europe, but is common in Inuits and South American Indians and has previously only once been identified in the laboratory.

Alleles↗

Space-time clustering of nasopharyngeal carcinoma in Greenland Eskimos.

Evidence of epidemicity of nasopharyngeal carcinoma (NPC) was sought in Greenland Inuits, who have a high incidence of this cancer, by examining the births of NPC cases for evidence of clustering in time and space. Births of cases were concentrated in autumn and winter. Fifty-four cases were analysed, and a two-fold excess of clustering within one year was observed, both within single districts and between adjacent districts. This excess was not significant at the 5% level; about 90 cases would have been required to confirm the observed effect at this level of significance. It is suggested that a search for space-time clustering of NPC cases in larger high-risk populations might prove more fruitful.

Age Factors↗