Clinical significance of P16INK4A and retinoblastoma proteins in non-small-cell lung carcinoma.
This study was performed to determine the frequency of expression loss of p16 and pRb; their relations with each other, tumour histology, tumour stage, nodal status, and survival in formalin fixed, paraffin embedded tumour tissues of patients with non-small-cell lung carcinoma (NSCLC). P16 and/or pRb expression loss is observed in 72 (75.8%) out of 95 patients, and 70 (73.7%) of them showed inverse correlation (P<0.05). Thirty-six (37.9%) of the p16 positive cases usually showed weak or moderate immunohistochemical staining. Loss of p16 expression was found to be significantly greater in squamous cell carcinoma than in adenocarcinoma cases, whilst no relation was observed with other clinical parameters. Immunohistochemical reactivity for pRb was generally moderate or strong. PRb expression loss was observed in 15.8% of the cases, and no relation was found between pRb loss and age, sex, tumour histology, tumour stage, or nodal status. PRb negative squamous cell carcinoma cases had significantly shorter survival independent of nodal status. These results suggest that disruption of p16/pRb pathway is frequently involved in NSCLC, and pRb expression loss in cases with squamous cell carcinoma may predict clinical outcome.
Akin
Hale
H
Department of Pathology, Istanbul University School of Medicine, Halkali Merkez Mh. Toplu Konutlar 3. Etap, Yenigün Blok B44, D: 55, Ikitelli, Capa, Istanbul, Turkey.
Yilmazbayhan
Dilek
D
Kiliçaslan
Zeki
Z
Dilege
Sükrü
S
Doğan
Oner
O
Toker
Alper
A
Kalayci
Göksel
G
D000230:Adenocarcinoma / Q000378:metabolism / Q000473:pathology; D000328:Adult; D000368:Aged; D000369:Aged, 80 and over; D002289:Carcinoma, Non-Small-Cell Lung / Q000378:metabolism* / Q000473:pathology; D002294:Carcinoma, Squamous Cell / Q000378:metabolism / Q000473:pathology; D016009:Chi-Square Distribution; D019941:Cyclin-Dependent Kinase Inhibitor p16 / Q000378:metabolism*; D018450:Disease Progression; D005260:Female; D006801:Humans; D007124:Immunoenzyme Techniques; D008175:Lung Neoplasms / Q000378:metabolism* / Q000473:pathology; D008297:Male; D008875:Middle Aged; D016016:Proportional Hazards Models; D016160:Retinoblastoma Protein / Q000378:metabolism*
D019941:Cyclin-Dependent Kinase Inhibitor p16; D016160:Retinoblastoma Protein