Clinical and molecular determinants of survival in pancreatic cancer patients treated with second line chemotherapy: results of an Italian/Swiss multicenter survey
4622 Background: The impact on survival of palliative second-line therapy in pancreatic cancer has not been clarified and clinical/molecular predictive factors are needed in order to decide which therapeutic regimens may be effective. Methods: Clinical records of 160 Gemcitabine resistant/refractory pancreatic cancer patients (pts) treated in 11 medical oncology departments in Italy and Switzerland were reviewed. All pts received a second line regimen from June 1997 to February 2006. There were 99 males, 61 females, median age 62 years (range 34–78) and median ECOG performance status (PS): 1 (range 0–2). 16 different salvage regimens were administered consisting of monotherapy with fluoropyrimidines in 59% of cases and combinations of platinum- salts/fluoropyrimidines in 36%. Fluoropyrimidines combinations with bevacizumab, irinotecan and mitomycin C were administered in the remaining 5%. ERCC-1 expression was examined by performing immunohistochemical staining in pts treated with platinum-salts. Results: Second line chemotherapy produced partial responses (PR) in 16 (10%) and stable disease (SD) in 40 pts (25%) by RECIST criteria. The median progression free survival (PFS) was 2.65 months. Multivariate analysis revealed that the most important prognostic factor for PFS was PS at the beginning of second line therapy (Second line PFS PS=0–1 vs PS=2: 78 days vs 48 days, p<0.05, log-rank test). Pts who had responded (PR) to first-line Gemcitabine were more likely to respond or attain stable disease after second-line treatment, with a PFS of 2.6 vs 1.6 months (p<0.05, log-rank test). The overall survival (OS) for all evaluable pts was 11.5 months and 1-year survival was 45%. Among 57 pts treated with platinum-containing doublets, a low ERCC1 level (28/57 pts) was highly predictive of longer survival (11.9 versus 9.9 months, p<0.05 log-rank test). Conclusions: These results suggest that fluoropyrimidine-based salvage regimens have marginal activity and should be considered only in pts with a good PS who have responded to first line chemotherapy. ERCC-1 expression should be further evaluated as a predictive test to select patients who may benefit from platinum/fluoropyrimidine salvage regimens. No significant financial relationships to disclose.