Anticancer prophylactic and treatment measures are approved initially among small populations contingents and, hence, their results are not essentially effecting demographic values. Changes of the state of selected contingents are evaluated by means of lethality or survival values. On the example of gastric cancer patients survival, the authors determine the period of observation necessary for preliminary evaluation of the efficiency of anticancer measures. During 5 years there was no clear change of survival of patients with gastric cancer of stage I-II (P > 0.05). The duration of the period of statistically valid reduction (P < 0.001) of the survival of patients with gastric cancer (stage III-IV) was two years. Thus, changes of the level of two year survival in patients advanced gastric cancer under the effect of anticancer measures may be used for express-evaluation of these measures.
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