AC is the most common histological subtype of lung carcinoma, both worldwide and in India, with an increasing trend in incidence [ 5 , 6 ].
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Correlation of TTF-1 immunoexpression and EGFR mutation spectrum in non-small cell lung carcinoma.
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The rate of TTF-1 expression was lower among uncommon/dual mutations (84%, 49/58) compared to exon 19 deletion (91%, 133/146) and exon 21 L858R (92%, 60/65), although this did not reach statistical significance ( Table 1 ).