The clinical significance of p21(WAF1/CIP-1) and p53 expression in pancreatic adenocarcinoma.

Abstract:

BACKGROUND:Wild-type p53 protein activates the WAF1/CIP-1 (p21) gene, leading to G1 arrest after DNA damage. The authors investigated the relation of p21 and p53 expression in pancreatic adenocarcinomas to disease stage, overall patient survival, and survival when chemotherapy or radiation therapy was given. METHODS:Paraffin embedded tissue sections of 75 ductal adenocarcinomas of the pancreas were immunostained for p53 and p21. Nuclear expression was scored as absent, focal (<10%), moderate (10-50%), or strong or diffuse (>50%). RESULTS:The median survival of patients whose pancreatic tumors expressed the p21 protein (43 of 75 cases, 57%) was better than that for patients whose tumors were p21 negative (32 of 75 cases, 43%) (median survival, 13.5 vs. 9.8 months, respectively; P = 0.23). No difference in survival was found with regard to p53 protein expression (43 of 75 cases, 57%); however, strong p53 expression was significantly associated with advanced disease stage (70% in Stage IV vs. 13-28% in lower stages). Expression of p21 correlated with earlier clinical stage. Stage specific comparisons showed a trend toward increased survival among p21 positive tumor patients diagnosed at clinical Stages I and III but not among those diagnosed at Stage IV. Adjuvant chemotherapy or radiation improved survival significantly if tumors expressed p21 or no p53. CONCLUSIONS:Expression of p21 is significantly associated with earlier clinical stage in pancreatic adenocarcinoma, perhaps accounting for the better survival observed in this patient group than among those whose tumors were p21 negative. Improved survival with either chemotherapy or radiation therapy was observed for patients whose tumors were p21 positive or p53 negative.

journal_name

Cancer

journal_title

Cancer

authors

Dergham ST,Dugan MC,Joshi US,Chen YC,Du W,Smith DW,Arlauskas P,Crissman JD,Vaitkevicius VK,Sarkar FH

doi

10.1002/(sici)1097-0142(19970801)80:3<372::aid-cnc

subject

Has Abstract

pub_date

1997-08-01 00:00:00

pages

372-81

issue

3

eissn

0008-543X

issn

1097-0142

pii

10.1002/(SICI)1097-0142(19970801)80:3<372::AID-CNC

journal_volume

80

pub_type

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