We conducted a hospital-based case-control study. The
participants in this study were new patients who visited three hospitals in the Northeast of Thailand (Srinagarind
Hospital - Khon Kaen University teaching hospital, Khon
Kaen Regional Hospital, and Sappasitthiprasong Ubon
Ratchathani Hospital) between July 2010 and April 2011,
and had been resident in the Northeast of Thailand for at
least 5 years. Case subjects were those with oral cancer
newly diagnosed by specialists, either otolaryngologists
or plastic surgeons, within 1 month prior to the interview.
Subjects-with cancers of the lips, base of tongue, other
and unspecified parts of tongue, gum, floor of mouth, hard
palate, other and unspecified parts of mouth, tonsil and
oropharynx (ICD-O; C00-C10) were included, excluding
those with salivary gland tumours (ICD-O; C07-C08),
Only cases confirmed as squamous cell carcinomas
by histopathology were included. Oral cancer patients
who had multiple primaries and, or previously received
treatment were excluded. Control subjects were patients
with a diagnosis of non-cancer conditions, and no chronic
illness of the head and neck regions and no history of
head and neck surgery. They were selected from the
general walk-in patients at the Out-Patient Department.
In addition, controls were matched by age (±3 years), sex,
and hospital visited of each case
We conducted a hospital-based case-control study. Theparticipants in this study were new patients who visited three hospitals in the Northeast of Thailand (SrinagarindHospital - Khon Kaen University teaching hospital, KhonKaen Regional Hospital, and Sappasitthiprasong UbonRatchathani Hospital) between July 2010 and April 2011,and had been resident in the Northeast of Thailand for atleast 5 years. Case subjects were those with oral cancernewly diagnosed by specialists, either otolaryngologistsor plastic surgeons, within 1 month prior to the interview.Subjects-with cancers of the lips, base of tongue, otherand unspecified parts of tongue, gum, floor of mouth, hardpalate, other and unspecified parts of mouth, tonsil andoropharynx (ICD-O; C00-C10) were included, excludingthose with salivary gland tumours (ICD-O; C07-C08),Only cases confirmed as squamous cell carcinomasby histopathology were included. Oral cancer patientswho had multiple primaries and, or previously receivedtreatment were excluded. Control subjects were patientswith a diagnosis of non-cancer conditions, and no chronicillness of the head and neck regions and no history ofhead and neck surgery. They were selected from thegeneral walk-in patients at the Out-Patient Department.In addition, controls were matched by age (±3 years), sex,and hospital visited of each case
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