Apoptotic index or a combination of Bax/Bcl-2 expression correlate with survival after resection of pancreatic adenocarcinoma.
In the present study, the prognostic impact of factors involved in the apoptosis pathway were tested on 67 consecutive patients treated with surgical resection. Included in the study were all patients resected for pancreatic adenocarcinoma from 1988 to 2003. Expression analysis for p53, Bax, and Bcl-2 were performed by immunohistochemical staining. Apoptotic cells were identified by the TUNEL method. These data were correlated with survival. Sixty-seven tumor specimens were included in the study. A strong positive correlation was recorded between p53 overexpression and Bax expression levels (P < 0.001). By univariate analysis, overall survival seemed to be improved with Bcl-2 and Bax expression (respectively, P = 0.0379 and 0.0311). The median survival time in patients with low apoptotic index was better versus those with a high index (P = 0.0127). Lymph node involvement was the only clinico-pathologic parameter that significantly correlated with overall survival (P = 0.0202). By a multivariate Cox regression analysis, the only immunohistochemical parameter that influenced overall survival was the apoptotic index (P = 0.040). Tumor's overexpression of both Bax and Bcl-2 resulted the strongest independent prognostic factor (P = 0.013). This is the first study to report a statistically significant association of apoptosis to overall survival for pancreatic cancer patients treated with surgical resection. The contemporary overexpression of Bax and Bcl-2 represents the strongest prognostic factor.
Magistrelli
Paolo
P
Department of Surgery, Catholic University School of Medicine, Rome, Italy.
Coppola
Roberto
R
Tonini
Giuseppe
G
Vincenzi
Bruno
B
Santini
Daniele
D
Borzomati
Domenico
D
Vecchio
Fabio
F
Valeri
Sergio
S
Castri
Federica
F
Antinori
Armando
A
Nuzzo
Gennaro
G
Caraglia
Michele
M
Picciocchi
Aurelio
A
D000230:Adenocarcinoma / Q000378:metabolism* / Q000473:pathology / Q000601:surgery*; D000368:Aged; D000369:Aged, 80 and over; D017209:Apoptosis; D005260:Female; D006801:Humans; D007150:Immunohistochemistry; D020287:In Situ Nick-End Labeling; D008297:Male; D008875:Middle Aged; D010190:Pancreatic Neoplasms / Q000378:metabolism* / Q000473:pathology / Q000601:surgery*; D019253:Proto-Oncogene Proteins c-bcl-2 / Q000378:metabolism*; D016019:Survival Analysis; D014407:Tumor Cells, Cultured; D016159:Tumor Suppressor Protein p53 / Q000378:metabolism; D051028:bcl-2-Associated X Protein / Q000378:metabolism*
D019253:Proto-Oncogene Proteins c-bcl-2; D016159:Tumor Suppressor Protein p53; D051028:bcl-2-Associated X Protein