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. 2001 Mar;92(3):285–292. doi: 10.1111/j.1349-7006.2001.tb01093.x

Aberrant Expression of pRb, p16, p14ARF, MDM2, p21 and p53 in Squamous Cell Carcinomas of Lung

Qi Xue 1, Takaaki Sano 1, Kenji Kashiwabara 1, Tetsunari Oyama 1, Takashi Nakajima 1,✉
PMCID: PMC5926708  PMID: 11267938

Abstract

Expression of cell cycle regulatory proteins in both the RB and p53 pathways was investigated in 50 cases of squamaous cell carcinoma (SCC) of the lung using immunohistochemical techniques.Abnormality of pRb and p16 expression was seen at the frequencies of 16% and 78%, respectively, and appeared to be in a reciprocal relationship. On the other hand, strong and diffuse p53 immunoreactivity was seen in 60% of SCCs. MDM2 and p14ARF expression. Moreover, strong p53 expression Moreover, strong p53 expression was not correlated with the expression of p21. In comparing clinicopathological status with immunohistochemical results, lack of p16 immunoreactivity was observed in the elderly group (over 65 years) as compared with the younger group (less than 65 years) Strong p53 expression was frequently observed in higher stages of SCC, with the developing tumor located in the central field of the lung. Similarly, the frequency of p14ARF expression was high in centrally developed SCC, but low in SCC developed in the periphery. These results suggest that disruption of the RB and p53 pathways is a frequent event in SCC, and that abnormal expression of p16 and p53 plays a more critical role than that of pRB, p14ARF and MDM2 in the development of SCC of the lung.

Keywords: tochemistry pRB pathway, p53 pathway, Squamous cell carcinoma, Lung, Immunohistochemistry

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