trivia I

• kaposi sarcoma is most common tumor in AIDS patients, mainly caused by human herpes simplex virus type 8.
• squamous cell carcinoma is the most common tumor of the oral cavity, represents 90-95% of oral malignancies and 3% of all malignant tumors. specific, primary etiology is unknown, but it may occur secondary to pre-malignant lesions like leukoplakia.
  
• chocolate may lead to heartburn.
• barret's esophagus is the only precursor of esophageal 'adeno'carcinoma.
• esophageal cancer is commonly seen in certain countries like china & iran.
• squamous cell carcinoma of the esophagus is more common in blacks, meanwhile the opposite is true for esophageal adenocarcinoma - more in whites.