A histochemical study of following five enzymes, diphospbopyridine nucleotide diaphorase (DPN-D), triphosphopyridine nucleotide diaphorase (TPN-D), succinic dehydrogenase (S-D), α-glyserophosphate dehydrogenase (α-GD), and phosphorylase (P-ase) has been carried out on fifty cases of surgically resected gastric cancer.
The histochemical demonstration of each enzymes was the same as that described in Part I.
The results were summerized as follows.
1) In general, gastric cancer cells showed a high activity of DPN-D and TPN-D, and both enzymes showed the similar staining pattern and localization DPN-D activity is slightly higher than that of the TPN-D. The poorly differentiated cancer cells showed a higher activity than well differeutiated ones.
The tumor cells at proliferating areas, such as at invading margine or isolated cell groups, showed an increased activity, while signet ring cells and cells at necrotic areas showed a weak activity.
2) S-D is parallel in its activity with α-GD, and S-D activity is slightly higher than that of α-GD. Generally, gastric cancer cells showed moderate activity of these enzymes, and the poorly differentiated cancer cells showed a lower activity than well differentiated ones. In the cases of scirrhus, some of them showed negative patterns. The cells of invading margine and isolated cell groups showed weak activity. The more, signet ring cells and necrotic part also showed no activity.
3) In general, P-ase activity was poor in the gastric cancer cells. Even though some of adenocarcinoma type of stomach cancer showed moderately increased activity, but carcinoma simplex and scirrhus type of stomach cancer hardly showed any activity.
4) It might therefore be well concluded that the characteristic reactions pattern of these enzymes in gastric cancer cells are high activity of DPN-D and TPN-D, and low activity of S-D, α-GD and P-ase.
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