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Angiogenesis is an important event for the tumoral growth and progression. The vascular endothelial growth factor (VEGF) is the most important factor in the vascular neoformation, and the increase on its expression is associated with tumoral progression and worse prognosis in many different malignant tumors. Objective: To evaluate the expression of VEGF-A and its receptor KDR/VEGF-2 in papillary thyroid carcinoma (CPT) larger and smaller than 10mm, with and without extracapsular extension (CPT-E and CPT-NE). Methods: The expression of VEGF-A and KDR was studied with tissular microarray (TMA) in 62 cases of CPT-E and CPT-NE larger and smaller than 10mm. The positivity of VEGF-A and KDR was predominantly citoplasmatic, and it was evaluated in (-), (+), and (++). Results: The expression of VEGF-A was very similar in CPT-E and CPT-NE with no statistical significance between tumoral size and between CPT-E and CPT-NE, but the expression intensity was harder for CPT-E >10mm, while the expression of KDR was more frequently observed in CPT-NE ⩽10mm, the intensity was similar for both groups and sizes. Conclusion: The results obtained correlate with the results publicated before, nevertheless, there are no publicated studies related with extracapsular extension and correlating VEGF-A and KDR. The intensity of the expression of VEGF-A was harder in CPT-E >10mm, while the expression intensity of KDR was similar between both groups concluding that the overexpression of VEGF-A, not the same for KDR, may be related to the extracapsular invasion, and because of that represents a worse prognosis. [ABSTRACT FROM AUTHOR]