Next-generation sequencing (NGS) to identify potential therapeutic targets in advanced pancreatic cancer.

Abstract

357 Background: Even with the advent of newer systemic therapies; long term survival in advanced PDAC is dismal. Hence there is an urgent need to use technologies such as NGS to identify potential therapeutic targets. Methods: A retrospective analysis was performed of all advanced PDAC patients (pts) evaluated with NGS through Foundation One (Foundation Medicine Inc., MA). DNA was extracted from biopsy specimens and sequencing was performed of 315 cancer-related genes plus select introns. Statistical analysis including Kaplan Meier survival analysis along with the log-rank test was used to compare the differences between groups. Results: 53pts were analyzed between Nov 2012 - Sep 2014; 25 (47%) were females; median age was 59 yrs (range: 33-77). 178 genomic alterations (GAs) were identified in 52 pts (average 3.43 GAs/pt). The GAs included mutations 140 (78%), amplifications 25 (14%), loss/deletions 13 (7%) and 1 pt had no GAs. Most frequent GAs and associated survival are listed in Table 1. There was no statistically significant difference in median overall survival (mOS) between the groups with or without KRAS (22.1 vs. 21 months; p=0.95) and with or without TP53 (21 vs. 23.4 months; p=0.76). 6/52 pts (12%) who had received at least 3 prior lines of therapy (range 3-4) and had an ECOG performance status <2; were treated off label with trametinib. The median PFS on the last therapy prior was 5 months (range 1.6-7). On trametinib, the median PFS was 1.9 months (range 1.1-7.1) with mOS of 5.1 months. Conclusions: Our data demonstrate that there are a range of GAs that are eligible for investigational targeted therapies. Secondly, the choice of agents (eg. Trametinib - targets downstream RAS effectors ) based on individual genomic profile can be considered when an appropriate clinical trial is not available or inaccessible even in heavily pretreated patients with a good performance status. Tumor profiling should be utilized in drug development to personalize treatment options in patients with advanced PDAC. [Table: see text]

Genomic profiling in pancreatic ductal adenocarcinoma and a pathway towards therapy individualization: A scoping review

“…A retrospective analysis of 52 advanced PDAC patients for whom next generation sequencing (NGS) data was available identified 6 patients who received trametinib after experiencing three or more lines of therapy and found a PFS of 1.9 months and median overall survival (mOS) of 5.1 months. However, the main objective of the study, to find a difference in mOS based on presence or absence of KRAS or P53 was not different [28].…”