The carcinoid tumor and adenocarcinoma components were found adjacent and closely apposed to each other (Figure 6D), with the adenocarcinoma component in right upper part of figure being strongly and diffusely immunoreactive (3+, cytoplasmic staining) for CK7 whilst the carcinoid tumor component in left lower part of figure being negative for CK7 (Figures 6D). This evidence concerns the gene KRT7 and carcinoid tumor.