Abstract 5865
Background
The 21-gene Breast Recurrence Score® (RS) is an established genomic tool to assess recurrence risk and adjuvant chemotherapy benefit in early breast cancer. The TAILORx study redefined group boundaries of the RS in node negative women. In the 668 patients of the NSABP-B14 study that formed the validation set of the RS younger age was significantly correlated with distant recurrence and tumour size trended toward significance. High tumour grade remained an independent prognostic factor beyond the RS. In the TAILORx study these higher risk groups were under-represented.
Methods
We compared clinical prognostic parameters of women in South East London with available RS with the TAILORx trial population. Retrospective case note analysis of all identified patients between 2013 and 2018 was completed. Women with nodal involvement were excluded. Descriptive statistics were used for comparison with patient characteristics of the TAILORx study.
Results
A total of 269 tests were identified. 42 were excluded for nodal involvement or incomplete clinical data, leaving 227 patients. Differences between the populations are demonstrated for all characteristics and will be presented at the meeting.Table:
263P Patient characteristic
RS | <11 | 11-25 | >26 | ALL |
N (%) | 34 (11) | 142 (67) | 51 (22) | 227 (100) |
Median age (range) | 48 (28-75) | 49 (28-74) | 53 (38-78) | 50 (28-78) |
≤50 yr % | 56 | 56 | 41 | 52 |
Premenopausal % | 59 | 64 | 47 | 59 |
Tumour size in cm Median (IQR) Mean (SD) | 2.0 (1.7-3.0) 2.6 ± 1.5 | 2.1 (1.5-3.0) 2.6 ± 1.8 | 2.2 (1.6-3.0) 2.4 ± 1.2 | 2.1 (1.6-3.0) 2.6 ± 1.6 |
Tumour grade % Low Intermediate High | 6 74 21 | 4 63 33 | 0 24 76 | 4 56 41 |
Clinical risk % Low High High (TAILORx) | 35 65 22 | 32 68 26 | 20 80 57 | 30 70 |
Conclusions
Our patients have a higher clinical risk than the TAILORx population. They are younger and have larger, higher grade cancers. This population is under-represented in the TAILORx study which was unable to exclude benefit in the ≤ 50 subset and may thus underestimate benefit from chemotherapy in our population. The current RS reporting is biased towards an older, low-risk population.
Clinical trial identification
Editorial acknowledgement
Legal entity responsible for the study
The authors.
Funding
Has not received any funding.
Disclosure
C. Gousis: Travel / Accommodation / Expenses: Roche. H. Kristeleit: Advisory / Consultancy, Speaker Bureau / Expert testimony, Travel / Accommodation / Expenses: Novartis; Advisory / Consultancy, Speaker Bureau / Expert testimony: Eisai; Advisory / Consultancy: Roche. All other authors have declared no conflicts of interest.
Resources from the same session
1694 - Pembrolizumab (pembro) Plus mFOLFOX or FOLFIRI in Patients With Metastatic Colorectal Cancer (mCRC): KEYNOTE-651 Cohorts B and D
Presenter: Richard Kim
Session: Poster Display session 2
Resources:
Abstract
908 - Romidepsin (FK228) Regulates the Expression of the Immune Checkpoint Ligand PD-L1 and Exerts Synergistic Anti-Tumor Activity with an Anti-PD-1 Antibody in Colon Cancer
Presenter: Hui Li
Session: Poster Display session 2
Resources:
Abstract
3127 - Prognostic significance of circulating regulatory T lymphocytes (Tregs) in patients with metastatic colorectal cancer (mCRC) under treatment with first line chemotherapy.
Presenter: Zafeiris Zafeiriou
Session: Poster Display session 2
Resources:
Abstract
5416 - The SAFFO study: Sex-related prognostic role And cut-oFf deFinition of monocyte-to-lymphocyte ratio (MLR) in metastatic colOrectal cancer
Presenter: Camilla Lisanti
Session: Poster Display session 2
Resources:
Abstract
2518 - SPICE, a phase I study of enadenotucirev in combination with nivolumab in tumors of epithelial origin: analysis of the metastatic colorectal cancer patients in the dose escalation phase
Presenter: Marwan Fakih
Session: Poster Display session 2
Resources:
Abstract
4000 - Phase 1/2 study with CXCL12 inhibitor NOX-A12 and pembrolizumab in patients with microsatellite-stable, metastatic colorectal or pancreatic cancer
Presenter: Niels Halama
Session: Poster Display session 2
Resources:
Abstract
2223 - Microsatellite Instability Status in Metastatic Colorectal Cancer and Effect of Immune Checkpoint Inhibitors on Survival in MSI-High Metastatic Colorectal Cancer
Presenter: Wataru Okamoto
Session: Poster Display session 2
Resources:
Abstract
2569 - Phase II trial of Trametinib (T) and Panitumumab (Pmab) in RAS/RAF wild type (wt) metastatic colorectal cancer (mCRC)
Presenter: Kanan Alshammari
Session: Poster Display session 2
Resources:
Abstract
5402 - Microsatellite instability and immunogenicity in colorectal cancer – do resident memory Tcells (Trm) play a role in colorectal cancer
Presenter: Wei Toh
Session: Poster Display session 2
Resources:
Abstract
5472 - Early response evaluation and CEA response in patients treated in a Danish randomized study comparing trifluridine/tipiracil (TAS-102) with or without bevazicumab in patients with chemorefractory metastatic colorectal cancer (mCRC)
Presenter: Camilla Qvortrup
Session: Poster Display session 2
Resources:
Abstract