Immunocytochemical staining of p-MAPK (50% ++) at baseline on buccal mucosa cells in patient responder to gefitinib treatment (combination of percentage of positive cells and staining intensity [negative 0, weak 1+, moderate 2+ and strong 3+]) (×200 original magnification). For further details, please see the article by Loprevite and associates on page 6518 of this issue.

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