Expression of Snail1 in tumor and stroma according to tumor stage.

Snail1 immunoreactivity was determined in the stromal or carcinoma cells corresponding to colorectal tumours classified in the different stages. According to Snail1 expression, tumours were classified as presenting Snail1 expression both in the tumour and stroma (T+/S+), just in the tumour (T+/S−), just in the stroma (T−/S+) or not present in either of these compartments (T−/S−).