T1able 2.

Classification of the four cytological stages based on ICT tests

Presence or absence of goblet ells	Appearance of the epithelial cells	Stages*	Results
Present	Numerous, small, in clusters	N	Negative
Present	Numerous, more small than enlarged cells occurring separately	M+	Negative
Absent: mucin spots present	More enlarged, separate cells than small cells occurring in clusters	M-	Positive
Absent	Enlarged, separate	D	Positive

N=Normal; M+=Marginal plus;

M-=Marginal minus; D=Vitamin A-deficient;

*Based on impression cytology with transfer test