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Table 2 Cancer sites considered in the 32 included studies

From: Meta-analysis of the relation between European and American smokeless tobacco and oral cancer

Cancer site Study numbers
  1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
Buccal mucosa   X X X X     X    X              X X       
Floor of mouth   X X X X     X       X    X   X      X X     X   
Gingiva      X                     X        
Gum/palate   a X   X     X X   X    X    X   X      X X    X X   
Lip X a X   X    X   X      X     X X          X    
Oral cavity/mouth    X    X X    X X   X X   X X X    X X X X X X X   X X X X
Pharynx/alveolus   X X X b X X   X X    X X X X X    X X X X   X X X    X X X
Tongue   a X   X      X      X   X X   X      X X    X X   
Tonsils   a X                       X      X   
Salivary glands      X      X      X              X     
Unspecified      b     X       X   Xc    X     X       X   
  1. a Specifically excluded by author
  2. b Due to the joint reporting of pharynx and larynx cases, both sites were excluded from analyses
  3. c Larynx cases could not be excluded due to incomplete reporting