Answer:
Intestinal Lymphoma
Explanation:
According to my research on different studies conducted by medical professionals, I can say that based on the information provided within the question this man is at highest risk of developing Intestinal Lymphoma. This is a cancer that targets the body's lymph nodes found all inside the body including the abdominal cavity. Based on the symptoms that the man is exhibiting this might be the most likely intestinal malignancy.
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