The immune system does not eliminate antigenic cancer cells due to a deficiency in the tumor environment of immunostimulating cytokines , for example:
> IL-2
> TNF-gamma
A patient with a peptic ulcer was admitted to the hospital and a gastric biopsy was performed. The tissue was cultured on chocolate agar incubated in a microaerophilic environment at 37°C for 5 to 7 days. At 5 days of incubation, colonies appeared on the plate and were curved, Gram-negative rods, oxidase-positive, urease- positive. The most likely identity of this organism is
Helicobacter pylori
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