Fibroblast growth factor receptor (FGFR)-2 can be inhibited by FGFR-selective or non-selective tyrosine kinase inhibitors (TKIs). Selective TKIs are approved for cholangiocarcinoma (CCA) with FGFR2 ...fusions; however, their application is limited by a characteristic pattern of adverse events or evocation of kinase domain mutations. A comprehensive characterization of a patient cohort treated with the non-selective TKI lenvatinib reveals promising efficacy in FGFR2-driven CCA. In a bed-to-bench approach, we investigate FGFR2 fusion proteins bearing critical tumor-relevant point mutations. These mutations confer growth advantage of tumor cells and increased resistance to selective TKIs but remain intriguingly sensitive to lenvatinib. In line with clinical observations, in-silico analyses reveal a more favorable interaction pattern of lenvatinib with FGFR2, including an increased flexibility and ligand efficacy, compared to FGFR-selective TKIs. Finally, the treatment of a patient with progressive disease and a newly developed kinase mutation during therapy with a selective inhibitor results in a striking response to lenvatinib. Our in vitro, in silico, and clinical data suggest that lenvatinib is a promising treatment option for FGFR2-driven CCA, especially when insurmountable adverse reactions of selective TKIs or acquired kinase mutations occur.
Abstract
Intrahepatic cholangiocarcinoma (iCCA) has emerged as a promising candidate for precision medicine, especially in the case of activating
FGFR2
gene fusions. In addition to fusions, a ...considerable fraction of iCCA patients reveals FGFR2 mutations, which might lead to uncontrolled activation of the FGFR2 pathway but are mostly of unknown functional significance. A current challenge for molecular tumor boards (MTB) is to predict the functional consequences of such FGFR2 alterations to guide potential treatment decisions. We report two iCCA patients with extracellular and juxtamembrane
FGFR2
mutations. After in silico investigation of the alterations and identification of activated FGFR2 downstream targets in tumor specimens by immunohistochemistry and transcriptome analysis, the MTB recommended treatment with an FGFR-inhibiting tyrosine kinase inhibitor. Both patients developed a rapidly detectable and prolonged partial response to treatment. These two cases suggest an approach to characterize further detected
FGFR2
mutations in iCCA to enable patients´ selection for a successful application of the
FGFR
-inhibiting drugs.
Abstract
BACKGROUND
Once first-line therapy options fail, there are no effective therapy options for most neuro-oncological conditions, including glioblastoma, gliomas, and brain metastases, thereby ...representing a high unmet clinical need. Novel targeted therapy options are often explored in small phase-I studies or are given as off-label therapies. Assessment of treatment efficacy in this setting is challenging and should incorporate outcome measures such as progression-free survival (PFS) or objective response rate (ORR) as well as clinical parameters. To address this, we developed the Neuro-Oncology Magnitude of Clinical Benefit Scale (Neuro-MCBS) as a comprehensive clinical tool to assess treatment efficacy in patients with CNS tumors who receive off-label targeted therapies outside of clinical trials. We prospectively evaluated the feasibility and clinical utility of the Neuro MCBS in a neuro-oncology patient cohort enrolled in MTB@ZPM.
METHODS
MTB@ZPM (NCT03503149) is a longitudinal observational study that provides comprehensive molecular profiling, consensus-guided and ranked targeted therapy recommendations and collection of prospective clinical outcome data. The Neuro-MCBS (grade 1 + 2=clinical benefit, grade 3=minimal benefit, grade 0=no benefit) was applied and correlated with PFS, the PFS2/PFS1 ratio, performance status (KPS, ECOG), and imaging parameters.
RESULTS
From February 1st, 2022 until January 31st, 2023, 70 patients were enrolled. While only a minority of n=17/36 (47%) glioblastoma and n=2/8 (25%) IDH-mutant astrocytoma patients benefited from targeted therapies, n=7/8 (88%) meningioma, n=9/10 (90%) brain metastases, and n=5/8 (63%) other tumor patients achieved a Neuro-MCBS of 1 or 2, i.e. derived clinical benefit from the molecularly based therapy.
CONCLUSIONS
The Neuro-MCBS is a comprehensive and clinically relevant assessment tool that incorporates clinical, imaging, and survival outcome data to determine the degree of clinical benefit from targeted therapies in patients with primary and secondary CNS tumors. Its incorporation into clinical practice provides an objective outcome measure of clinical utility vs. futility of targeted therapies.
Sequencing of tumour tissue with comprehensive gene panels is increasingly used to guide treatment in precision oncology. Analysis of tumour–normal pairs allows in contrast to tumour-only assessment ...direct discrimination between somatic and germline alterations, which might have important implications not only for the patients but also their families.
We performed tumour normal sequencing with a large gene panel in 1048 patients with advanced cancer to support treatment decision. Sequencing results were correlated with clinical and family data.
We identified 156 likely pathogenic or pathogenic (LP/P) germline variants in cancer predisposition genes (CPGs) in 144 cases (13.7%). Of all patients, 8.8% had a LP/P variant in autosomal-dominant cancer predisposition genes (AD-CPGs), most of them being genes with high or moderate penetrance (ATM, BRCA2, CHEK2 and BRCA1). In 48 cases, the P/LP variant matched the expected tumour spectrum. A second variant in tumour tissue was found in 31 patients with AD-CPG variants. Low frequency mutations in either TP53, ATM or DNMT3A in the normal sample indicated clonal haematopoiesis in five cases.
Tumour–normal testing for personalised treatment identifies germline LP/P variants in a relevant proportion of patients with cancer. The majority of them would not have been referred to genetic counselling based on family history. Indirect functional readouts of tumour–normal sequencing can provide novel links between CPGs and unexpected cancers. The interpretation of increasingly complex datasets in precision oncology is challenging and concepts of interdisciplinary personalised cancer prevention are needed to support patients and their families.
•Significant amount of relevant germline variants is detected by blood-tumour testing.•Carriers do not always fulfil clinical criteria for cancer predisposition.•Blood–Tumour testing identifies novel links between cancer predisposition genes and cancer types.•Family-specific screening strategies are required when cancer predisposition genes are found in atypical tumours.
Abstract
Comprehensive genomic profiling and biomarker-based therapeutic strategies are currently used in clinical trials and in innovative health care systems including the center for personalized ...medicine network. Systematic assessments of patient-reported outcomes are warranted to gain insight into the perspective of patients and their relatives during biomarker-based therapies. In the present study, we focused on health-related quality of life (HRQoL), psychosocial situation, and physical symptoms in patients treated at the Center for Personalized Medicine Tübingen. First, we retrospectively evaluated symptom burden of n=265 (neuro-)oncological patients in the Molecular Tumor Board (MTB). Sixty percent of patients reported at least 1 neurological symptom, and psychosocial burden/unmet needs were high (overall 156/265; 59%, patients with malignant tumors n=86/106; 81%, Fisher’s exact, p < 0.0001). We therefore developed an app by 14 expert rounds and pretesting including validated assessments of HRoL, symptom und psychological burden and tested it in a pilot study. We conducted a structured interview with users 3 months afterwards to assess the app’s usability and feasibility. The interview was transcribed and analyzed according to a qualitative content analysis. So far, a total of 10 patients and caregivers have been enrolled in this pilot study. They reported that (i) the app is compatible with their daily routine (median 9.3, range 0-10), that (ii) they are more aware of their health status, which was rated as positive, and that (iii) completing app-based questionnaires was easier compared to paper questionnaires. Two patients reported technical problems, which were resolved timely. The pilot study proved feasibility and acceptance of the app. The app might optimize symptom burden assessment, adapted to the patients’ profiles. The next step is to prospectively compare HRQoL before and after start of targeted therapy in a multicenter study.
Biomarker-based therapies are increasingly used in cancer patients outside clinical trials. Systematic assessment of patient-reported outcomes (PRO) is warranted to take patients' perspectives during ...biomarker-based therapies into consideration. We assessed the feasibility of an electronic PRO assessment via a smartphone application.
An interdisciplinary expert panel developed a smartphone application based on symptom burden and health-related quality of life (HRQoL) metrics reported in a retrospective analysis of 292 neuro-oncological patients. The app included validated assessments of health-related quality of life (HRQoL), the burden of symptoms, and psychological stress. Feasibility and usability were tested in a pilot study. Semi-structured interviews with patients and health care professionals (HCP) were conducted, transcribed, and analyzed according to Mayring´s qualitative content analysis. Furthermore, we assessed compliance and descriptive data of ePROs.
A total of 14 patients have been enrolled, (9 female, 5 male). A total of 4 HCPs, 9 patients, and 1 caregiver were interviewed regarding usability/feasibility. The main advantages were the possibility to complete questionnaires at home and comfortable implementation in daily life. Compliance was high, for example, 82% of the weekly distributed NCCN distress thermometer questionnaires were answered on time, however, with interindividual variability. We observed a median distress score of 5 (range 0-10, 197 results,
= 12, weekly assessed) and a median Global health score of 58.3 according to the EORTC QLQ-C30 instrument (range 16.7-100, 77 results,
= 12, monthly assessed).
This pilot study proved the feasibility and acceptance of the app. We will therefore expand its application during biomarker-guided therapies to enable systematic PRO assessments.
Abstract
Background
The clinical utility of molecular profiling and targeted therapies for neuro-oncology patients outside of clinical trials is not established. We aimed at investigating feasibility ...and clinical utility of molecular profiling and targeted therapy in adult patients with advanced tumors in the nervous system within a prospective observational study.
Methods
molecular tumor board (MTB)@ZPM (NCT03503149) is a prospective observational precision medicine study for patients with advanced tumors. After inclusion of patients, we performed comprehensive molecular profiling, formulated ranked biomarker-guided therapy recommendations based on consensus by the MTB, and collected prospective clinical outcome data.
Results
Here, we present initial data of 661 adult patients with tumors of the nervous system enrolled by December 31, 2021. Of these, 408 patients were presented at the MTB. Molecular-instructed therapy recommendations could be made in 380/408 (93.1%) cases and were prioritized by evidence levels. Therapies were initiated in 86/380 (22.6%) cases until data cutoff. We observed a progression-free survival ratio >1.3 in 31.3% of patients.
Conclusions
Our study supports the clinical utility of biomarker-guided therapies for neuro-oncology patients and indicates clinical benefit in a subset of patients. Our data might inform future clinical trials, translational studies, and even clinical care.
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