Periodic acid-Schiff (PAS) staining was carried out on leukemic cells from 83 patients of acute childhood leukemia and the results of PAS reactions by percentage positivities were classified into 4 patterns: coarse granular-bandlike type, drop- (or spot-) like type, fine granular type and negative type.
The correlations between PAS-Patterns and each one of cytomorphologic types of leukemic cells, initial features (white blood cell count, age and mediastinal mass) and prognoses were also studied.
1) Three of five patients with ALL showed coarse granular-bandlike type and their mean percentage positivity was 59.7%.
2) All seven patients with peroxidase positive AML showed fine granular type and their mean percentage positivity was 75.8%.
3) For AUL and peroxidase negative AML, there were all types of PAS-Patterns and no remarkable difference for their mean percentage positivities.
4) Patients were classified into three groups by initial features (white blood cell count, age and mediastinal mass), two of them had all types of PAS-Patterns and they showed no significant difference, but in the last group with mediastinal mass, two of four patients showed negative type.
5) In ten of nineteen patients to whom more than twice PAS stainings were carried out, the results of PAS reaction were changed during their course of acute leukemia.
6) 50% survival of coarse granular-bandlike type was 41.5 months, while droplike type showed 21.6 months, fine granular type 19.5 months and negative type 16.5 months. 50% first complete remission duration diminished in the order of coarse granular-bandlike type (16.5 months), droplike type (12.3 months), fine granular type (5.6 months) and negative type (4.6 months).
From these data, we may conclude that PAS reaction is available to estimate prognosis of acute leukemia of childhood.
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