Hi, high cholesterol is not a risk factor for liver cancer. Many liver lesions or body changes could cause an increase in the levels of AST and ALT. A cause is usually sought to know exactly what causes this increase. Its worth while doing tests to for viral hepatitis, especially Hepatitis B and C which normally should be excluded in such cases. The increase in the liver enzyme levels in your case is not that alarming, and confronting these results with other results are required for any appropriate interpretation and adequate concluding clinical judgements could be made. A liver ultrasound shall give an idea about the structure of the liver and any possible nodules, cysts or collections. It orients the clinical to make a suspicion . Definitive diagnosis of liver cancer is usually based only on histologic/biopsy studies. However, specific blood markers could also help. I believe you should be patient for the results of the liver ultrasound. However, main risk factors for liver cancer are excessive intake of alcohol, liver hepatitis viruses (B and C), drugs and some hereditory diseases. Excessive smoking is instead a major risk factor in lung, eosophagal and to a smaller extent, gastric cancer. Meeting a gastroenterologist afer your ultrasound in case you are still very worried is a reasonable option.