Genetic status of p53 in stomach cancer: somatic mutations and polymorphism of codon 72.

The incidence of somatic mutagenesis of p53 oncosuppressor protein in malignant tumors of the stomach and genetic polymorphism of p53 were studied in patients with stomach cancer on DNA samples isolated from tumor tissues obtained during surgery. The incidence of Pro/Pro genotype increased in the patients, while the percentage of Arg/Pro heterozygotes was markedly lower compared to long-living persons without cancer. The incidence of p53 somatic mutations in exons 5, 7, 8 was 70.

Resistance of mice exposed to whole-body irradiation to transplanted hemopoietic cells modified with RNA preparations.

The resistance of irradiated mice to bone marrow grafts treated with RNA from the liver of syngenic, allogenic, or xenogenic (rat) species was studied. Syngenic recipients developed resistance to grafts treated with allogenic RNA. The resistance to allografts increased after treatment with xenogenic RNA, whereas treatment of allo- and xenografts with syngenic RNA facilitated their take.