固定集団における胃癌の自然史―X線診断の立場より―特に陥凹性sm癌を中心として

Natural History of Gastric Cancer in a Fixed Population: with Emphasis on Depressed sm Cancer

要旨　固定集団の逐年検診より得られた陥凹性早期胃癌をretrospectiveおよびprospectiveにそのX線像を検討することにより，特にsm癌について次のような成績を得た．（1）大多数のm癌の存在期間はかなり長く，数年から10年以上に及び，かなりバラエティーに富んでいるが，一般にsm癌では比較的短く，数か月から1年内外と推定された．（2）早期胃癌の自然史の分析には，m癌およびsm癌の深達度m₁，m₂，m₃，sm₁，sm₂，sm₃に細分し，その診断基準とする必要がある．特にsm癌の場合にはm₃，sm₁，sm₃の分析が必要で，m₃またはsm₁からsm₃にかけてのX線像がかなり著明に変化していた．

　X-ray films of depressive type early gastric cancers, detected in a fixed population (occupational group) by an annual screening program, were reviewed both retrospectively and prospectively. The following results were obtained regarding the natural history of sm cancer: (1) While the period of existence for m cancers was long (several years to more than 10 years) with marked variability, that for sm cancers was estimated to be relatively short (several months to less than a year). (2) Natural history of early gastric cancer was analyzed using the criteria on the depth of invasion, obtained by dividing m and sm cancers into m₁, m₂ and m₃, and sm₁, sm₂ and sm₃, respectively, according to the degree of the depth of invasion. Although diagnosing the depth of invasion, particularly in m₃, sm₁ and sm₃ cancers, was important for analyzing natural history of sm cancer, x-ray findings markedly varied from m₃ and sm₁ to sm₃.