Figure 4From: Trastuzumab anti-tumor efficacy in patient-derived esophageal squamous cell carcinoma xenograft (PDECX) mouse models PIK3CA gene mutation in model EC039 and the corresponding primary tumor identified by ARMS method (a) and confirmation of PIK3CA gene mutation in 1624 nucleotide, corresponding to codon 542 (GAA542AAA/E542K) in exon 9 helical domain of PIK3CA gene by PCR-direct sequencing (b: Forward, c: Reverse). Back to article page