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. 2007 Nov 15;7:334. doi: 10.1186/1471-2458-7-334

Table 2.

Cancer sites considered in the 32 included studies

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		X^c			X				X						X

^aSpecifically excluded by author

^bDue to the joint reporting of pharynx and larynx cases, both sites were excluded from analyses

^cLarynx cases could not be excluded due to incomplete reporting

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