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Medicare reimburses for PET scans for the following cancers : colorectal , lung , lymphoma , and melanoma , head and neck and esophageal cancers , and also for refractory seizures ( epilepsy ) . Numerous studies suggest that man-made products cause fewer than 5 % of cancers . Bolivia 's major newspapers Friday carried stories claiming that the tumor was cancerous , and the Catholic Church 's radio station said that " reliable sources in the government have confirmed the president has widespread , developed cancer . There was no statistically significant difference between the two groups in number of cancer cases or in the characteristics or severity of tumors . PET shows the extent of disease - - called staging - - of lung cancer , colorectal cancer , melanoma , head and neck cancer , breast cancer , lymphoma and many other cancers . One study suggested that obesity , rather than fat intake per se , predisposed to colon cancers induced in animals by exposure to the carcinogen azoxymethane . Of course this rules out talking about the probability that an individual has cancer . Vitamin B6 deficiency has also been associated with an increased risk for certain cancers . Explanations for the conflicting results regarding whether dietary fat or meat intake affects risk of colorectal cancer [ 42 ] include ( a ) validity of dietary questionnaires used ; ( b ) differences in the average age of the population studied ; ( c ) variations in methods of meat preparation ( in some instances , mutagenic and carcinogenic HCAs could have been released at high temperatures [ 52 ] ) ; and ( d ) variability in the consumption of other foods such as vegetables . Breast cancer : Estrogen taken with progesterone ( Prempro ) increases the risk of breast cancer .