Knox, Jennifer J, Jaffee, Elizabeth M, O'Kane, Grainne M, King, Daniel, Laheru, Dan, Yu, Kenneth H, Perez, Kimberly, Habowski, Amber N, Grant, Robert C, Fischer, Sandra, Aguirre, Andrew, Jang, Raymond Woo-Jun, Devoe, Craig E, O'Reilly, Eileen M, Dodd, Anna, Wolpin, Brian M, Ye, Xiang Y, Notta, Faiyaz, Gallinger, Steven, Tuveson, David A (June 2024) Early results of the PASS-01 trial: Pancreatic adenocarcinoma signature stratification for treatment-01. In: 2024 ASCO Annual Meeting II.
Abstract
Background: Over 60% of patients with pancreatic ductal adenocarcinoma (PDAC) present with metastatic disease. Both modified FOLFIRINOX (mFFX) and gemcitabine/nab-paclitaxel (GnP) are first-line options in advanced PDAC, however have not been compared prospectively in North American patients. Moreover, biomarkers to guide selection are lacking. Basal-like and Classical subtypes are prognostic, but their predictive impact is unknown. Patient-derived organoids (PDOs) are now feasible to study for drug pharmacotyping. Expedient molecular profiling with additional PDO drug sensitivities could enable better precision choices in PDAC. Methods: PASS-01 is a multi-center randomized phase II trial evaluating the benefit of 1<jats:sup>st</jats:sup> line mFFX vs GnP in de novo metastatic PDAC patients with ECOG PS 0-1, (germline BRCA1/2, PALB2 excluded) who have baseline tumor biopsies (bx) for whole genome/transcriptional sequencing (WGTS) and PDO generation/pharmacotyping with standard and novel drugs. The primary endpoint is the PFS of mFFX vs GnP (received at least 1 dose of assigned chemo, per protocol (PP)), 136 patients needed to reach 80% power to detect a difference in median PFS of 7 vs 5 months between mFFX and GnP at significance level of 0.3 in a 2-sided test. Secondary endpoints include: ORR, SAEs, OS, impact of RNA signatures and GATA6 expression on outcomes. Each patient is discussed at a molecular tumor board immediately following their 1<jats:sup>st</jats:sup> 8-week CT with the goal of recommending precision 2nd-line treatment options on progression. Results: This trial accrued 160 pts between 09/20 and 01/24, 45% in Canada, 55% in US with 140 eligible for 1<jats:sup>st</jats:sup> line PFS, data lock Mar 1/24 (see table). Median PFS (PP) was 5.1 mo for GnP and 4.0 mo for mFFX (p=0.14). Best response PR/SD for GnP: 29/45% and 24/35% for mFFX. SAEs attributed to the study were 3% GnP, 13% mFFX and 0.7% bx. Median OS (ITT) was 9.7 mo with GnP and 8.4 mo with mFFX, p=0.04. Of 113 patients in the PP analysis with progression, 64 (57%) received 2nd-line treatment (GnP, n= 30, mFFX n=34) Of these, a correlate-guided approach was delivered in 32 (50%), including 21 (66%) receiving chemo and 11 (34%) receiving a targeted or immunotherapy regimen. Correlative studies are underway. Preliminary analysis shows >80% successful whole genomes and >72% RNA signatures. PP patients include 9 % KRAS wild-type and 21% Basal-like PDAC. PDO-drug models have been established in 50%. Conclusions: Upfront multi-omic profiling of PDAC can be successfully incorporated into a multicenter randomized trial. While we have observed PP improved PFS and ITT longer OS favouring GnP in this cohort without gBRCA 1/2 or PALB2m, the benefit of chemo for advanced PDAC patients remains poor, with 43% unable to receive 2<jats:sup>nd</jats:sup> line, arguing strongly for the development of 1<jats:sup>st</jats:sup>-line biomarker selected strategies. Clinical trial information: NCT04469556
| Item Type: | Conference or Workshop Item (Paper) |
|---|---|
| Subjects: | diseases & disorders > cancer diseases & disorders diseases & disorders > cancer > cancer types > pancreatic cancer diseases & disorders > cancer > cancer types |
| CSHL Authors: | |
| Communities: | CSHL labs > Tuveson lab |
| SWORD Depositor: | CSHL Elements |
| Depositing User: | CSHL Elements |
| Date: | 5 June 2024 |
| Date Deposited: | 24 Sep 2024 13:13 |
| Last Modified: | 24 Sep 2024 13:13 |
| Related URLs: | |
| URI: | https://repository.cshl.edu/id/eprint/41685 |
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