Table 1.

Summary of reasons for exclusion of records.

Reasons for Exclusion	No of Records Excluded
FNA based diagnosis	17
Prior Cancer	88
Prior and simultaneous cancer	3
Prior and later cancer	21
Simultaneous multiple cancers	4
Simultaneous and subsequent cancers	3
Later cancer	58
Carcinoma in situ	3
Illegible records	32
Missing records	30