PIP and glycogen storage disease VI: Positive GCDFP15 staining was seen in 28 of 34 (82%) intraepithelial disease components (1+ in 12/28, 2+ in 4/28, 3+ in 4/28, 4+ in 8/28) and 9 of 10 (90%) invasive adenocarcinomas (1+ in 3/10, 3+ in 1/10, and 4+ in 5/10; 5/5 type Ib disease, 4/5 type Ic disease) (Table 1, Figs. 2, 3).