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Prostate stem cell antigen (PSCA) expression in primary tumour samples. To assess whether PSCA was also frequently expressed in primary tissue samples obtained from patients with pancreatic cancer, 14 samples were stained and antigen expression evaluated by immunohistochemistry. (A) The grading strategy used to assess expression based on the intensity of PSCA staining. (B) Examples of tumour isolates from six patients deemed to be highly PSCA-positive
