As described in a previous study, the desmoplastic reaction status was evaluated according to the ratio of the area of the tumour-associated stroma to that of the whole tumour tissue [32 (link)]. Histologic images were obtained using the light microscope (Olympus BX53®, Tokyo, Japan) with an attached digital camera (DP27®, Japan) and Olympus cellSens™ Entry software. The subjected areas were measured on haematoxylin and eosin-stained OSCC tumour tissue sections with ImageJ software. The desmoplasia status was further divided into two groups according to the calculated ratio: high (ratio ≥ 1) and low desmoplastic (ratio < 1) reaction.
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