Morphological and immunohistochemical validation personalized patient-derived xenograft model of non-small cellular lung cancer

The aim of the study was to carry out a comparative morphological and immunohistochemical analysis of peripheral non-small cell lung cancer, which served as a source of a xenograft tumor, and tissues of the third generation of a tumor that developed in animals.Material and methods. We used 19 athymic BALB/c nu/nu mice, which were intraperitoneally injected with 1×106 CD8+ after sublethal irradiation in accordance with the humanization protocol. The transplantation of a tumor obtained from a 64-year-old patient was carried out three times consecutively. Samples of the original and xenograft tumors were automatically stained with hematoxylin and eosin, rabbit anti-CK7, anti-TTF, and anti-Ki67 antibodies. The evaluation of histological samples was carried out in accordance with the WHO recommendations (2015).Results. It has been established that a third-generation tumor developing in the body of athymic humanized mice retains the morphological and immunohistochemical features of the patient's original tumor. The described approach may be used in preclinical and personalized studies in fundamental pharmacology and molecular oncology.