Table 3.

Summary for EGFR gene copy number alterations in multiple primary OSCC patients

	Case	Primary cancer site	EGFR gene copy number	Second cancer site	EGFR gene copy number	Third cancer site	EGFR gene copy number
1	OR147	Left alveolus	Polysomy	Right tongue	Trisomy with Focal amplification	Left tongue	Polysomy
2	OR218	Left alveolus	Disomy	Recurrence	Trisomy or polysomy	2nd recurrence	Polysomy
3	OR276	Left bucca	Disomy	Right hard palate	Disomy	Right alveolus	Polysomy
4	OR295	Right tongue	Disomy	Left tongue	Disomy	Hard palate (3rd primary)	Disomy
5	OR325	Right mouth floor	Disomy	Soft palatal	Disomy	Recur from 2nd primary	Disomy