Pathological Characteristics of Gastric Carcinomas in the Very Old

A total of 69 gastric carcinomas of very old people (aged ≥85) were collected and pathologically analyzed in comparison with those of young to middle‐aged (30–39) and elderly (65–69) people, with special attention to their phase. In the very old, almost all (34/35) carcinomas in the early phase belonged to well‐differentiated categories. In the advanced phase, half of them (17/34) were classified into poorly differentiated categories when determined from the predominant pattern, but a well‐differentiated pattern almost always coexisted in the superficial site. Thus, the gastric carcinomas in the very old may principally develop as well‐differentiated carcinomas which then progress to poorly differentiated carcinomas with time, in contrast to those of the young to middle‐aged, most of which emerged from the very early phase as poorly differentiated lesions. The gross features of the carcinomas were also in line with these histological observations. The carcinomas of the elderly showed distinct similarity to those of the very old. The results suggest that poorly differentiated carcinomas of the young to middle‐aged and the old may be better classified and analyzed separately in view of the generally recognized etiological (e.g., specifically close causal relationship with environmental factors of the intestinal‐type carcinoma of the old) and biological (e.g., practically no tendency for hematogenous metastasis of the diffuse‐type carcinoma of the young to middle‐aged) differences, although in the General Rules for Gastric Cancer Study of Japan, both are placed in the same category, por (por2).