<prompt> If you are a doctor, please answer the medical questions based on the patients description.Hi my sister is suffering from cancer aged 29yrs.Impression :- Moderate to poorly differentiated Grade III tubulopapillary and trabecullar adenocarcinoma caecal endoscopy biopsy after post surgery and 6 sets of chemo in PET scan nothing was seen result was good but i want to know the chances of recurrence...? and what are the precautions to be taken such as food items..pls reply  <response>: Hi!welcome to Chat Doctor!Its good that after treatment nothing was seen in PET scan. Recurrence is strongly related to stage of tumor which in turn depends on size and extent of primary tumor, presence of cancer cells in regional or distant lymph nodes and spread of cancer cells to other organs. In occurrence of these cancers both environmental diet and genetic factors play role. It is observed in populations with a Western type diet, i.e. highly caloric food rich in animal fat, meat consumption, smoking and alcohol consumption are risk factors. To prevent it vegetable consumption, and physical activity are important and fiber may have a protective role. I sincerely hope this information is useful for you! 