Expression of proliferating cell nuclear antigen and CD44 variant exon 6 in primary tumors and corresponding lymph node metastases of colorectal carcinoma with Dukes' stage C or D

Figure 1 Positive expression of PCNA in primary colorectal carcinoma tissue (LSAB × 100).

Figure 2 Negative expression of PCNA in primary site (LSAB × 100).

Figure 3 CD44v6 was observed on the cell membrane of tumor cells (LSAB × 100).

Figure 4 Expression of CD44v6 in corresponding metastatic lymph node, showing that tumor cells were invading lymph node from periphery. (LSAB × 100).