Abstract 1790
Background
SA are widely used and recommended to ameliorate skin reactions induced by EGFR inhibition. Randomised studies have shown a positive impact of SA on severity of skin reactions, but the influence on outcome are widely unknown. Recent data suggests that antibiotics negatively influence the efficacy of checkpoint-inhibitor therapies. Therefore, an evaluation of the impact of SA on the outcome of RAS-wt mCRC pts treated with cetuximab-based therapy is highly needed.
Methods
Pts with RAS-wt mCRC treated with a cetuximab-based first-line combination and written informed consent were eligible for this prospective, non-interventional study. According to a thorough questionnaire about prophylactic treatments for skin management, pts were categorized in 2 groups: SA and no SA. Outcome endpoints like objective remission rate (ORR), progression free survival (PFS), overall survival (OS), and time to treatment failure (TTF) were compared between the two subgroups.
Results
Data from 583 of 875 enrolled pts were evaluable at the data cut-off (SA: n = 183; no SA: n = 400). Pts were not included for the following reasons: no cetuximab therapy (34), not fully documented (131), no first-line therapy (95), no RAS-wt (2), and no skin questionnaire (30). Pts in the SA group showed compared to the no SA group a significantly increased median PFS with 12.30 vs 9.51 months (p = 0.033) and OS with 28.22 vs. 20.79 months (p = 0.0063). Number of cetuximab infusions were numerically higher in the SA group (mean: 30.6 vs 27.4, p = 0.0581), as well as ORR with 63.9% and 56.5% (p = 0.09) and TTF with 5.46 vs 4.61 months (p = 0.0746), but all three endpoints did not reach significance. In a multivariate analysis the impact of SA was an independent significant factor on OS (p < 0.05), but not on PFS (p = 0.09).
Conclusions
Data of this large non-interventional trial suggests that SA have a positive impact on the OS outcome of RAS-wt mCRC pts treated with a cetuximab-based first-line therapy. Hence, the data supports the recommendations for SA in the treatment management of EGFR inhibitors in mCRC.
Clinical trial identification
Editorial acknowledgement
Felix Eilenberger, Alcedis GmbH, Gießen, Germany.
Legal entity responsible for the study
Merck Serono GmbH, Darmstadt, Germany, an affiliate of Merck KGaA, Darmstadt, Germany.
Funding
Merck Serono GmbH, Darmstadt, Germany, an affiliate of Merck KGaA, Darmstadt, Germany.
Disclosure
S.W. Sahm: Shareholder / Stockholder / Stock options: Merck KGaA; Honoraria (self): Fresenius Kabi; Research grant / Funding (institution): Merck Serono GmbH. M. Zahn: Honoraria (self): Merck Serono GmbH. J. Janssen: Advisory / Consultancy, Research grant / Funding (self): Bayer; Advisory / Consultancy: Boehringer Ingelheim; Advisory / Consultancy, Research grant / Funding (institution): Bristol-Myers Squibb; Advisory / Consultancy, Research grant / Funding (institution): Novartis; Advisory / Consultancy, Research grant / Funding (institution): Roche; Advisory / Consultancy, Research grant / Funding (institution): Sanofi; Advisory / Consultancy, Research grant / Funding (institution): PharmaMar; Research grant / Funding (institution): Amgen; Research grant / Funding (institution): Onyx; Research grant / Funding (institution): Baxter; Research grant / Funding (institution): Biotest; Research grant / Funding (institution): Celgene; Research grant / Funding (institution): Janssen Cilag Ltd; Research grant / Funding (institution): Kedrion Biopharma; Research grant / Funding (institution): Eli Lilly; Research grant / Funding (institution): Merck Serono GmbH; Research grant / Funding (institution): Octapharma; Research grant / Funding (institution): Pfizer; Research grant / Funding (institution): Puma Biotechnology; Research grant / Funding (institution): Teva Pharmaceutical; Research grant / Funding (institution): AbbVie; Research grant / Funding (institution): Ipsen; Research grant / Funding (institution): Servier. C. Hering-Schubert: Honoraria (self): Novartis; Honoraria (self), Advisory / Consultancy: Amgen; Honoraria (self): Sanofi. I. Zander: Advisory / Consultancy: Boehringer Ingelheim; Honoraria (self): Pfizer; Honoraria (self): Mundipharma; Travel / Accommodation / Expenses: Bristol-Myers Squibb; Travel / Accommodation / Expenses: Novartis; Travel / Accommodation / Expenses: Ribosepharm; Travel / Accommodation / Expenses: Merck Serono GmbH. K.G. Stenzel: Full / Part-time employment: Merck Serono GmbH; Shareholder / Stockholder / Stock options: Merck KGaA. F. Overkamp: Leadership role, Full / Part-time employment: OncoConsult. Hamburg GmbH; Leadership role, Full / Part-time employment: onkowissen.de GmbH; Honoraria (self), Advisory / Consultancy: Amgen; Honoraria (self), Advisory / Consultancy: Bayer; Honoraria (self): AstraZeneca; Honoraria (self), Advisory / Consultancy: Bristol-Myers Squibb; Honoraria (self), Advisory / Consultancy: Boehringer Ingelheim; Advisory / Consultancy: Cellex; Advisory / Consultancy: ClinSol; Honoraria (self), Advisory / Consultancy: Gilead; Advisory / Consultancy: Hexal; Honoraria (self), Advisory / Consultancy: Iomedico; Honoraria (self), Advisory / Consultancy: Merck Sharp & Dohme; Honoraria (self), Advisory / Consultancy: Novartis; Honoraria (self), Advisory / Consultancy: Riemser; Advisory / Consultancy: Roche; Advisory / Consultancy: Tesaro; Advisory / Consultancy: Teva; Honoraria (self): Chugai; Honoraria (self): Celgene; Honoraria (self): Eisai; Honoraria (self): Ipsen; Honoraria (self): Janssen-Cilag; Honoraria (self): Merck Serono GmbH; Honoraria (self): Novo Nordisc; Honoraria (self): Servier; Honoraria (self): Shire. All other authors have declared no conflicts of interest.
Resources from the same session
1109 - First Canadian Interim Analysis from the Phase IIIb CompLEEment-1 Ribociclib + Letrozole HR+ HER2- Advanced Breast Cancer Trial
Presenter: Cristiano Ferrario
Session: Poster Display session 2
Resources:
Abstract
4401 - Real-world effectiveness of first-line palbociclib + letrozole for metastatic breast cancer 4 years post approval in the US
Presenter: Jonathan Kish
Session: Poster Display session 2
Resources:
Abstract
5876 - Palbociclib-Fulvestrant (PALBO-FUL) and Everolimus -Exemestane (EVE-EXE) for Second line Hormonal Treatment (HT) of Metastatic Breast Cancer (MBC) with Lobular Histology: a Propensity Score Matched Analysis of a Multicenter ‘Real-World’ Patients (pts) Series.
Presenter: Armando Orlandi
Session: Poster Display session 2
Resources:
Abstract
3587 - Dose-escalation study of G1T48, an oral selective estrogen receptor degrader (SERD), in postmenopausal women with ER+/HER2- locally advanced or metastatic breast cancer (ABC)
Presenter: E Dees
Session: Poster Display session 2
Resources:
Abstract
5696 - Final results of the STEM trial: SFX-01 in the Treatment and Evaluation of ER+ Her2- Metastatic breast cancer (mBC)
Presenter: Sacha Howell
Session: Poster Display session 2
Resources:
Abstract
1475 - Alpelisib (ALP) + Fulvestrant (FUL) in Hormone-Receptor Positive (HR+), Human Epidermal Growth Factor Receptor-2–Negative (HER2–) Advanced Breast Cancer (ABC): Subgroup Analysis by Presence of Visceral Metastasis (VM) in the SOLAR-1 Trial
Presenter: Mario Campone
Session: Poster Display session 2
Resources:
Abstract
2549 - Phase 1 Dose Escalation Study of a Selective Androgen Receptor Modulator RAD140 in Estrogen Receptor Positive (ER+), HER2 Negative (HER2-) Breast Cancer (BC)
Presenter: Erika Hamilton
Session: Poster Display session 2
Resources:
Abstract
3787 - A Phase I study of XZP-3287, a novel oral CDK4/6 Inhibitor, administered on a continuous dosing schedule, in patients with advanced solid tumours
Presenter: Binghe Xu
Session: Poster Display session 2
Resources:
Abstract
4835 - Phase-I dose-escalation and expansion study of the PARP inhibitor, fluzoparib (SHR3162), in patients with advanced solid tumors
Presenter: Huiping Li
Session: Poster Display session 2
Resources:
Abstract
5083 - Phase 2 study of DHP107 (Liporaxel®, oral paclitaxel) in first-line, HER2 negative recurrent/metastatic breast cancer (OPTIMAL study, NCT03315364)
Presenter: Jin-Hee Ahn
Session: Poster Display session 2
Resources:
Abstract