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The results of immunohistochemical staining for NTRK1 and NTRK2 by lung cancer subtype are summarized in Table 3.
Expression of NTRK2 also correlates with squamous carcinoma of lung, although less so than NTRK1 (139 of 271 cases positive, Kendall [tau]-b = 0.
Correlation of NTRK1 and NTRK2 Immunohistochemistry and Patient Outcome
There is a significant positive correlation between positive NTRK2 staining in squamous carcinoma and improved DSS (log-rank test, [chi square] = 11.
NTRK2 expression status in adenocarcinoma is not significantly correlated with DSS (log-rank test, [chi square] = 1.
NTRK1 and NTRK2 are preferentially expressed in squamous cell carcinoma of lung when compared with other histologic subtypes of lung carcinoma, most notably adenocarcinoma.
We are presently exploring the utility of NTRK1 and NTRK2 in this manner by comparison with other markers including p63, CK5/6, CK7, and TTF-1.
We found the immunohistochemical expression of NTRK2 to be a significant predictor of improved DSS and OS in squamous cell lung carcinoma.