Virtual Library
Start Your Search
J. De Castro
Author of
-
+
P1.01 - Advanced NSCLC (ID 757)
- Event: WCLC 2017
- Type: Poster Session with Presenters Present
- Track: Advanced NSCLC
- Presentations: 1
- Moderators:
- Coordinates: 10/16/2017, 09:30 - 16:00, Exhibit Hall (Hall B + C)
-
+
P1.01-040 - Clinical Utility of Plasma-Based NGS for Advanced-Stage NSCLC Patients with Insufficient or Unavailable Tumor Tissue (ID 10215)
09:30 - 09:30 | Author(s): J. De Castro
- Abstract
Background:
The failure rate of tissue-based NGS in newly diagnosed NSCLCs is approximately 20-25 %, reaching 40 % in the case of tumor biopsy samples collected at disease progression. In this study, we are analyzing the clinical utility of plasma-based NGS using cell-free circulating tumor DNA (ctDNA) for advanced-stage lung adenocarcinoma patients, as a complement or alternative to tissue-based molecular profiling.
Method:
Eight Academic Spanish Institutions are participating in patient recruitment. We are stratifying patients in three cohorts: 1) Patients with advanced-stage lung adenocarcinomas with insufficient tumor tissue for EGFR, ALK or ROS1 analysis; 2) Patients with EGFR, ALK or ROS1 altered tumors with acquired TKI resistance; 3) Patients with EGFR T790M positive cancers progressing on third generation EGFR TKIs. Next-generation ctDNA sequencing is being performed using GUARDANT360 73-gene panel at a CLIA certified central laboratory facility (Redwood City, California). We are stratifying gene variant actionability into four levels according to the OncoKB website criteria.
Result:
We have currently included 97 patients (January-June 2017). Complete clinical and molecular data are available at present for the first 37 patients. Twelve, 19 and 6 patients have been enrolled in cohorts 1, 2 and 3 respectively. Never smoker patients were overrepresented (n = 21, 56 %), predominantly at cohorts 2 and 3. A total of 30 cases (81 %) had detectable ctDNA. We have detected potentially actionable genetic alterations involved in mitogenic pathways in 16 patients (43 %). Level 1 alterations (variants with matched approved drugs) were found in three patients’ tumors (25 %) from cohort 1 (two EGFR sensitizing mutations and one ROS1 rearrangement). Nine patients (36 %) from cohort 2 and 3 had tumors with potentially targetable acquired genetic alterations, including three cases with EGFR T790M mutations and one case with a ROS1 kinase domain mutation. Six patients (16 %) received matched targeted therapies, four (11 %) in genotype-driven clinical trials. Reasons for not receiving matched targeted therapies in patients with actionable tumors were clinical deterioration or death (n = 2), unavailability of matched clinical trials (n = 6), treatment with non-genotype-tailored therapies (n =1) or no disease progression to ongoing therapies (n =1). Final clinical and molecular data of the whole cohort will be provided at the meeting.
Conclusion:
On the basis of our preliminary data, next-generation ctDNA sequencing (GUARDANT 360) appears to detect actionable genetic alterations when tissue is unavailable, avoiding multiple biopsies and enabling rapid patient selection for genotype-tailored therapies.
-
+
PL 02 - Presidential Symposium including Top 3 Abstracts and James Cox Lectureship Award Presentation (ID 585)
- Event: WCLC 2017
- Type: Plenary Session
- Track: Early Stage NSCLC
- Presentations: 1
- Moderators:Hisao Asamura, Keunchil Park
- Coordinates: 10/17/2017, 08:15 - 09:45, Plenary Hall (Exhibit Hall D)
-
+
PL 02.04 - SCAT Ph III Trial: Adjuvant CT Based on BRCA1 Levels in NSCLC N+ Resected Patients. Final Survival Results a Spanish Lung Cancer Group Trial (ID 9523)
08:40 - 08:50 | Author(s): J. De Castro
- Abstract
- Presentation
Background:
Postop platinum-based CT is considered standard of care in resected NSCLC with lymph node involvement. BRCA1 and BRCA2 are important DNA repair factors primarily involved in the repair of double strand DNA breaks. BRCA-1 functions may act as a differential regulator of response to cisplatin (Cis) and antimicrotubule agents. BRCA1 defficiency enhances Cis resistance and loss of BRCA1 function is associated to sensitivity to DNA-damaging CT and may also be associated with resistance to spindle poisons.
Method:
SCAT randomized phase III multicenter trial tests individualized optimal CT based on expression of BRCA1. After surgery patients (p) with St II and Iii NCSLC were random 1:3 to control arm (3 cycles Cis-Docetaxel) or to experimental arm with treatment assigned according BRCA1 expression levels (low levels: Cis-Gemcitabine; intermediate levels: Cis-Doc; high levels: Docetaxel alone). Stratification factors: N1 vs N2; age < or > 65 y; non-Squamous vs Squamous (Sq) histology; lobectomy vs pneumonectomy). Planned PORT in N2. Primary end-point OS. Secondary end-points DFS, toxicity profile (CTCAE v 3.0) /compliance, recurrence pattern. Statistical hypothesis: 5y survival rate control group (45%) could be increase 20% in experimental arm.
Result:
From June/2007 to May/2013, a total of 591 p were screened and 500 of them were randomized in the study, 108 in control arm, 392 in experimental arm. In experimental arm 110 p received Cis-Gem, 127 Cis-Doc and 110 Doc alone. There were no significant differences between arm for known prognostic factors: Median age 64 y; 79% males, 21% females; 43% Sq, 49% Adenoca, 8% others; 57% former smokers, 32% current smokers, 11% never smokers; pneumonectomy 26%; N1 58%, N2 48%. Median tumor size 4.4 cm (0.8-15.5 cm). Median mRNA BRCA1 levels 15.78 (0.73-132). Mean BRCA1 levels 6.95 in Adenoca vs 20.29 in Sq (p<0.001). Compliance of CT was better in experimental arm with less dose-reductions and without differences according extent of surgery. CT compliance was lower in patients older 70 y. Median PFS: 38.7 m (control), 32.2 m Cis-Gem, 34.3 m Cis-Doc and 41 m Doc. At 5 years, event-free rate is 54% in control arm and 56% in experimental arm and median OS 73.3 m (control) vs 77.5 m (exp) (p=0.75). In experimental arm: Docetaxel alone 80.2 m, Cis-Doc 80.5 m and Cis-Gem 74 m.
Conclusion:
Higher survival than expected in patients with lymph node involvement. No significant difference in survival achieved with the experimental arm. In case of high levels BRCA CT treatment without cisplatin is not detrimental. (Eudract:2007-000067-15; NCTgov: 00478699)
Only Members that have purchased this event or have registered via an access code will be able to view this content. To view this presentation, please login, select "Add to Cart" and proceed to checkout. If you would like to become a member of IASLC, please click here.
