Linitis Plastica (Stomach with Mucicarmine Stain)

A 59 year old man presented with post-prandial abdominal pain and bloating, one episode of hematemesis and iron-deficiency anemia. Upper endoscopy was performed and revealed a large, thickened, non-distensible stomach. The patient underwent a partial gastrectomy.

Questions

Describe the histological features of this process.
What is the diagnosis?
What is the prognosis of this disease?
The mucicarmine stain is used to stain what cell product?