Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Diffuse gastric cancer ?
    ### Response:
    Diffuse gastric cancer or signet ring cell cancer is a type of cancer found most often in the glandular cells lining the stomach, but can also develop in the bowel, breast, pancreas, bladder, prostate or lung. The 2010 WHO (World Health Organization) classification recognizes four major histologic patterns of gastric cancers: tubular, papillary, mucinous and poorly cohesive (including signet ring cell carcinoma), plus uncommon histologic variants.
    