%0 Journal Article %J Polish Journal of Pathology %@ 1233-9687 %V 73 %N 1 %D 2022 %F Soini2022 %T Claudin 6 is associated with a short survival and a short recurrent free interval in non-small cell lung carcinoma %X We investigated the expression of claudin 6 in non-small-cell lung carcinomas (NSCLC) by immunohistochemistry. Samples of 164 patients with NSCLC were studied by immunohistochemistry. Claudin 6 was expressed in 42 % of cases. Its expression was significantly more frequent in adeno- than in squamous cell carcinoma (p = 0.002). There was no association between the TNM status and claudin 6 expression. Claudin 6 associated with a poor prognosis of the patients and with a short recurrence-free interval (p = 0.002, p < 0.001). The association with survival had independent prognostic value (p = 0.011). The results show that claudin 6 can be regarded as a marker of poor prognosis in lung cancer. This is different to some other cancers, such as breast and cervical carcinoma suggesting that claudin 6 probably induces other cellular pathways in neoplastic lung cells than in those tumors. In lung cancer, adenocarcinomas were most abundantly positive indicating a higher linkage of claudin 6 to glandular differentiation. %A Soini, Ylermi %A Pirinen, Risto %A Takasawa, Kumi %A Osanai, Makoto %A Takasawa, Akira %P 1-5 %9 journal article %R 10.5114/pjp.2022.117171 %U http://dx.doi.org/10.5114/pjp.2022.117171