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Attend this session at the
2019 ASCO Annual Meeting!


Session: Gastrointestinal (Noncolorectal) Cancer

Type: Poster Session

Time: Monday June 3, 8:00 AM to 11:00 AM

Location: Hall A

Methylated circulating tumor DNA (Met-DNA) as an independent prognostic factor in metastatic pancreatic adenocarcinoma (mPAC) patients.

Sub-category:
Pancreatic Cancer

Category:
Gastrointestinal (Noncolorectal) Cancer

Meeting:
2019 ASCO Annual Meeting

Abstract No:
4136

Poster Board Number:
Poster Session (Board #241)

Citation:
J Clin Oncol 37, 2019 (suppl; abstr 4136)

Author(s): Daniel Pietrasz, Shufang Wang-Renault, Laetitia Dahan, Julien Taieb, Karine Le Malicot, Yves Rinaldi, Solene Doat, Jean-Marc Phelip, Valerie Taly, Jean-Baptiste Bachet, Pierre Laurent-Puig; Paul Brousse Hospital, Villejuif, France; Paris Descartes University, Paris, France; La Timone University Hospital, Marseille, France; Hôpital Européen Georges-Pompidou, Sorbonne Paris Cite/Paris Descartes University, Paris, France; FFCD and INSERM U1231, Dijon, France; Hôpital Européen, Marseille, France; University Hospital Pitie Salpetriere APHP, Paris, France; Universite Jean Monnet, Saint-Etiennes, France; Pitié-Salpêtrière Hospital, Paris, France

Abstract Disclosures

Abstract:

Background: Circulating tumor DNA has emerged as prognostic biomarker in oncology. Many different genes can be mutated within a tumor, complicating procedures, even with highly sensitive next-generation sequencing (NGS). DNA methylation in promotor of specific genes is an early key epigenetic change during oncogenesis. Specific methylated genes could be a potential relevant cancer biomarker that may substitute for NGS panels. The aim of this study was to assess the prognostic value of Met-DNA in mPAC. Methods: Prognostic value of Met-DNA was assessed in a prospective cohort (PLAPAN) of mPAC (training cohort), correlated with NGS, then in two prospective independent validation cohorts from two randomized phase II trials (PRODIGE 35 and 37). Plasma samples were collected before chemotherapy on EDTA-coated tubes. Met-DNA was quantified using two specific markers of pancreatic DNA methylation by digital droplet PCR and correlated with prospectively registered patient (pts) characteristics and oncologic outcomes (progression free survival (PFS) and overall survival (OS)). Results: 330 patients (pts) were enrolled. 60% (n = 58) of the 96 pts of the training cohort had at least one Met-DNA marker. The correlation with NGS assessment was R = 0.93 (Pearson; p < 0.001). 59.5% (n = 100/168) and 59% (n = 39/66) of pts had detectable Met-DNA in the 2 validation cohorts. In the training cohort, Met-DNA was correlated with poor OS (HR = 1.82; 95%CI 1.07-2.42; p = 0.026). In validation cohorts, Met-DNA was a prognostic factor of PFS (HR = 1.62; 95%CI 1.17-2.25, p = 004) and OS (HR = 1.79; 95%CI 1.28-2.49, p < 0.001) in PRODIGE 35, as in PRODIGE 37: PFS HR = 1.79 (95%CI 1.07-2.99; p = 0.026) and OS HR = 2.08 (95%CI [1.18-3.68], p = 0.01), respectively. In multivariate analysis adjusted on gender, age, CA19-9 > 40UI.mL, treatment arm, number of metastatic sites and stratified on center, Met-DNA was independently associated with poor OS in both trials: HR = 1.81 (95%CI 1.10-2.98; p = 0.02) and HR = 3.62 (95%CI: 1.32-9.93; p = 0.01). Conclusions: This study demonstrates that Met-DNA is a strong independent prognostic factor in mPAC. These results argue for patient’s stratification on ctDNA status for further randomized trials. Clinical trial information: NCT02827201 and NCT02352337

 
Other Abstracts in this Sub-Category:

 

1. Olaparib as maintenance treatment following first-line platinum-based chemotherapy (PBC) in patients (pts) with a germline BRCA mutation and metastatic pancreatic cancer (mPC): Phase III POLO trial.

Meeting: 2019 ASCO Annual Meeting Abstract No: LBA4 First Author: Hedy L. Kindler
Category: Gastrointestinal (Noncolorectal) Cancer - Pancreatic Cancer

 

2. APACT: phase III, multicenter, international, open-label, randomized trial of adjuvant nab-paclitaxel plus gemcitabine (nab-P/G) vs gemcitabine (G) for surgically resected pancreatic adenocarcinoma.

Meeting: 2019 ASCO Annual Meeting Abstract No: 4000 First Author: Margaret A. Tempero
Category: Gastrointestinal (Noncolorectal) Cancer - Pancreatic Cancer

 

3. Randomized phase II study of second-line modified FOLFIRI with PARP inhibitor ABT-888 (Veliparib) (NSC-737664) versus FOLFIRI in metastatic pancreatic cancer (mPC): SWOG S1513.

Meeting: 2019 ASCO Annual Meeting Abstract No: 4014 First Author: E. Gabriela Chiorean
Category: Gastrointestinal (Noncolorectal) Cancer - Pancreatic Cancer

 

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