Oops, you're using an old version of your browser so some of the features on this page may not be displaying properly.

MINIMAL Requirements: Google Chrome 24+Mozilla Firefox 20+Internet Explorer 11Opera 15–18Apple Safari 7SeaMonkey 2.15-2.23

ePoster Display

1483P - Cell-free DNA dominant clone allele frequency associates with poor outcomes in advanced pancreatic cancer

Date

16 Sep 2021

Session

ePoster Display

Topics

Targeted Therapy

Tumour Site

Pancreatic Adenocarcinoma

Presenters

Pedro Uson Junior

Citation

Annals of Oncology (2021) 32 (suppl_5): S1084-S1095. 10.1016/annonc/annonc709

Authors

P.L.S. Uson Junior1, G. Botrus1, J. Yin2, H. Dada3, L. Drusbosky3, U. Majeed4, D. Ahn1, M. Sonbol1, M. Borad5, T. Bekaii-Saab6, K. Mody7

Author affiliations

  • 1 Hematology/oncology, Mayo Clinic, 85054 - phoenix/US
  • 2 Statistics, Mayo Clinic, 32224 - Jacksonville/US
  • 3 Genetic Mutations, Guardant360, 94063 - redwood/US
  • 4 Medical Oncology, Mayo Clinic, 32224 - Jacksonville/US
  • 5 Oncology Department, Mayo Clinic Cancer Center, 85259 - Scottsdale/US
  • 6 Medical Oncology Department, Mayo Clinic Cancer Center, 85054 - Phoenix/US
  • 7 Hematology/oncology, Mayo Clinic, 32224 - Jacksonville/US

Resources

Login to get immediate access to this content.

If you do not have an ESMO account, please create one for free.

Abstract 1483P

Background

Circulating cell-free tumor DNA (ctDNA) is an emerging tool under investigation in pancreatic cancer (PC). This study aimed to evaluate the prognostic value of ctDNA variant allele frequency (VAF) in advanced PC collected at diagnosis.

Methods

Patients with advanced pancreatic cancer and ctDNA collected at time of initial diagnosis were retrospectively evaluated. For analysis we considered the detected gene with highest VAF as the dominant clone allele frequency (DCAF). The DCAF was evaluated in relation to patients’ demographics, systemic treatment response, progression-free survival (PFS) and overall survival (OS).

Results

A total of 104 patients were included in the analysis. The median age was 70 years (range 43-91), 50% were male, 38.5% with locally advanced disease and 61.5% with metastatic disease. Somatic alterations were detected in 84.6 % of the patients and were more pronounced in metastatic PC, 91% of metastatic PC patients had at least one genetic alteration detected compared to 74% of patients with locally advanced disease (p=0.03). 66 patients underwent chemotherapy with gemcitabine and paclitaxel (64%) and 29 patients with FOLFIRINOX (28%). The most detected genes were KRAS, TP53, CDKN2A and SMAD4. The median DCAF was 0.45% (0-55%). DCAF >0.45% was associated with worse median PFS (median PFS: 6 vs. 14 months, p=0.00013) and median OS (median OS: 10 vs. 24 months, p=0.00027).

Conclusions

Patients with advanced PC with DCAF > 0.45% at diagnosis have worse PFS and OS compared to patients with low ctDNA.

Clinical trial identification

Editorial acknowledgement

Legal entity responsible for the study

The authors.

Funding

Has not received any funding.

Disclosure

All authors have declared no conflicts of interest.

This site uses cookies. Some of these cookies are essential, while others help us improve your experience by providing insights into how the site is being used.

For more detailed information on the cookies we use, please check our Privacy Policy.

Customise settings
  • Necessary cookies enable core functionality. The website cannot function properly without these cookies, and you can only disable them by changing your browser preferences.