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The information you have provided is inadequate.
With the information that SGPT is 600+ alone is not sufficient to give a opinion. If the complete liver
function test report is available, a better opinion can be given.
Scan should also be done. I presume scan was done and cholelithiasis
was diagnosed based on that. Cholelithiasis most often does not cause any symptom and does not raise SGPT to the level of 600+.
If there is obstruction to common bile duct, there might be a slight raise in it. But the alkaline phosphatase
is raised much higher.
Yes, H.pylori infection can cause cancer if not treated. But not all cases lead to cancer and it takes years before an untreated H.pylori infection can cause cancer.