Μελέτη δεικτών μεθυλίωσης στον καρκίνο των ωοθηκών

2019 ◽  
Author(s):  
Λυδία Γιαννοπούλου
Keyword(s):  
Overall Survival ◽  
Ovarian Carcinoma ◽  
Real Time ◽  
Tumor Cells ◽  
Progression Free Survival ◽  
Circulating Tumor Dna ◽  
High Grade ◽  
Free Survival ◽  
Serous Ovarian Carcinoma ◽  
Tumor Dna

Ο καρκίνος των ωοθηκών αποτελεί τον τέταρτο συχνότερα εμφανιζόμενο γυναικολογικό καρκίνο και την πέμπτη αιτία θανάτου σχετιζόμενη με καρκίνο στις γυναίκες. Χαρακτηρίζεται από αξιοσημείωτη ιστολογική και μοριακή ετερογένεια, με κυριότερο υπότυπο τον ορώδη καρκίνο ωοθηκών υψηλού βαθμού κακοήθειας (high grade serous ovarian carcinoma, HGSC), που μελετήθηκε στη διατριβή. Η παρούσα διατριβή έχει σκοπό τη μελέτη της μεθυλίωσης επιλεγμένων γονιδίων στον ορώδη καρκίνο ωοθηκών υψηλού βαθμού κακοήθειας. Τα κλινικά δείγματα που χρησιμοποιήθηκαν είναι δείγματα πρωτοπαθών όγκων, αντίστοιχα δείγματα παρακείμενων ιστών, καθώς και αντίστοιχα δείγματα κυκλοφορούντος καρκινικού DNA (circulating tumor DNA, ctDNA) από τις ίδιες ασθενείς. Οι μεθοδολογίες που εφαρμόστηκαν συνιστούν την real-time MSP για την ανίχνευση της μεθυλίωσης σε δείγματα πρωτοπαθών όγκων, παρακείμενων ιστών και πλάσματος, καθώς και την MS-HRMA για τον ημιποσοτικό προσδιορισμό της μεθυλίωσης σε δείγματα πρωτοπαθών όγκων και παρακείμενων ιστών. Αρχικά εξετάστηκε η μεθυλίωση του ογκοκατασταλτικού γονιδίου RASSF1A, όπου πραγματοποιήθηκε μία συγκριτική μελέτη σε δείγματα πρωτοπαθών όγκων, παρακείμενων ιστών και ctDNA ασθενών με HGSC. Η μεθυλίωση του γονιδίου στα δείγματα πρωτοπαθών όγκων και παρακείμενων ιστών συσχετίστηκε με σημαντικά μειωμένη ολική επιβίωση (overall survival, OS) των ασθενών. Τα συνολικά αποτελέσματα της μελέτης υπέδειξαν για πρώτη φορά την προγνωστική σημασία της μεθυλίωσης του γονιδίου στον HGSC. Στη συνέχεια, ακολούθησε μελέτη μεθυλίωσης του γονιδίου ESR1, όπου πραγματοποιήθηκε μελέτη σε δείγματα πρωτοπαθών όγκων και ctDNA ασθενών με HGSC. Η μεθυλίωση του γονιδίου στα δείγματα πρωτοπαθών όγκων συσχετίστηκε με σημαντικά αυξημένα OS και διάστημα επιβίωσης χωρίς εξέλιξη της νόσου (progression free survival, PFS) των ασθενών. H παρούσα μελέτη αποτέλεσε μία προσπάθεια αποσαφήνισης του ρόλου της μεθυλίωσης του γονιδίου στον HGSC. Ακολούθησαν οι μελέτες μεθυλίωσης γονιδίων που εμπλέκονται σε μοριακά μονοπάτια που διαταράσσονται στον HGSC, όπως τα γονίδια BRCA1 και MGMT που συμμετέχουν σε διαφορετικές πορείες επιδιόρθωσης του DNA, το γονίδιο NR2F1 που συμμετέχει ενεργά στην κυτταρική αδράνεια, τα γονίδιο RASSF10 που εμπλέκεται στην ανάπτυξη χημειοαντίστασης, καθώς και το γονίδιο RKIP που συμμετέχει στην ΕΜΤ διαδικασία. Ύστερα από τη συνολική επεξεργασία των αποτελεσμάτων, παρατηρήθηκε στατιστικά σημαντική συσχέτιση της μεθυλίωσης του γονιδίου NR2F1 στα δείγματα πρωτοπαθών όγκων, με μειωμένο PFS. Επιπλέον, η μεθυλίωση του γονιδίου BRCA1 στο ctDNA συσχετίστηκε με σημαντικά αυξημένο PFS. Τέλος, πραγματοποιήθηκε μελέτη της έκφρασης του γονιδίου PD-L1 σε δείγματα κυκλοφορούντων καρκινικών κυττάρων (circulating tumor cells, CTCs) ασθενών με HGSC, με την εφαρμογή RT-qPCR. Με βάση τα αποτελέσματα της μελέτης, παρατηρήθηκε στατιστικά σημαντική συσχέτιση της έκφρασης του γονιδίου με μειωμένη OS των ασθενών, υποδεικνύοντας μία πιθανή προγνωστική σημασία στον HGSC.

scholarly journals Serial Monitoring of Circulating Tumor DNA by Next-Generation Gene Sequencing as a Biomarker of Response and Survival in Patients With Advanced NSCLC Receiving Pembrolizumab-Based Therapy

2021 ◽  
pp. 510-524
Author(s):  
Jeffrey C. Thompson ◽  
Erica L. Carpenter ◽  
Benjamin A. Silva ◽  
Jamie Rosenstein ◽  
Austin L. Chien ◽  
...  
Keyword(s):  
Overall Survival ◽  
Progression Free Survival ◽  
Circulating Tumor Dna ◽  
Variant Allele ◽  
Molecular Response ◽  
Next Generation ◽  
Free Survival ◽  
Variant Allele Fraction ◽  
Tumor Dna ◽  
Allele Fraction

PURPOSE Although the majority of patients with metastatic non–small-cell lung cancer (mNSCLC) lacking a detectable targetable mutation will receive pembrolizumab-based therapy in the frontline setting, predicting which patients will experience a durable clinical benefit (DCB) remains challenging. MATERIALS AND METHODS Patients with mNSCLC receiving pembrolizumab monotherapy or in combination with chemotherapy underwent a 74-gene next-generation sequencing panel on blood samples obtained at baseline and at 9 weeks. The change in circulating tumor DNA levels on-therapy (molecular response) was quantified using a ratio calculation with response defined by a > 50% decrease in mean variant allele fraction. Patient response was assessed using RECIST 1.1; DCB was defined as complete or partial response or stable disease that lasted > 6 months. Progression-free survival and overall survival were recorded. RESULTS Among 67 patients, 51 (76.1%) had > 1 variant detected at a variant allele fraction > 0.3% and thus were eligible for calculation of molecular response from paired baseline and 9-week samples. Molecular response values were significantly lower in patients with an objective radiologic response (log mean 1.25% v 27.7%, P < .001). Patients achieving a DCB had significantly lower molecular response values compared to patients with no durable benefit (log mean 3.5% v 49.4%, P < .001). Molecular responders had significantly longer progression-free survival (hazard ratio, 0.25; 95% CI, 0.13 to 0.50) and overall survival (hazard ratio, 0.27; 95% CI, 0.12 to 0.64) compared with molecular nonresponders. CONCLUSION Molecular response assessment using circulating tumor DNA may serve as a noninvasive, on-therapy predictor of response to pembrolizumab-based therapy in addition to standard of care imaging in mNSCLC. This strategy requires validation in independent prospective studies.

Efficacy and safety of weekly paclitaxel in elderly patients with heavily pretreated platinum-resistant ovarian carcinoma.

2021 ◽  
Vol 39 (15_suppl) ◽  
pp. e17552-e17552
Author(s):  
Rodrigo Sanchez-Bayona ◽  
Pablo Tolosa ◽  
Ana Sanchez de Torre ◽  
Alicia Castelo ◽  
Elsa Bernal-Hertfelder ◽  
...  
Keyword(s):  
Peripheral Neuropathy ◽  
Ovarian Carcinoma ◽  
Progression Free Survival ◽  
High Grade ◽  
Efficacy And Safety ◽  
Free Survival ◽  
Serous Ovarian Carcinoma ◽  
Platinum Resistant ◽  
Heavily Pretreated ◽  
Grade 3

e17552 Background: In platinum-resistant ovarian cancer treatment, single-agent paclitaxel can be used alone or in combination with bevacizumab. We aimed to assess the efficacy and safety profile of a weekly paclitaxel (WP) scheme in heavily pretreated platinum-resistant high-grade serous ovarian carcinoma. Methods: We retrospectively analyzed 30 adult patients with platinum-resistant high-grade serous ovarian carcinoma treated with WP at our institution between 2015 and 2020. Patients with platinum-resistant ovarian, fallopian tube or primary carcinoma of the peritoneum who had received at least 3 doses of WP (80 mg/m2) alone or in combination with bevacizumab until disease progression or unacceptable toxicity were included in the analysis. Progression-free survival was assessed according to the Response Evaluation Criteria in Solid Tumors version 1.1. Information about toxicity was gathered from medical reports and lab tests. Kaplan-Meier curves and Log-rank test were performed for survival estimates. Results: In our sample, the median age was 68 years (IQR: 60-75) and the median number of previous lines of systemic treatment was 3 (range 1-5). 40% of patients received WP in combination with bevacizumab. The disease control rate was 60.7% (42.9% partial response and 17.8% stable disease). In the overall analysis, the median progression-free survival (mPFS) was 5.0 months (95% CI: 2.0-7.1 months). The presence of ascites significantly shortened the mPFS compared to patients without it (1.1 vs 5.1 months, p < 0.001). Even though the addition of bevacizumab to WP improved the mPFS, the difference was not statistically significant compared to WP alone (7.1 vs 4.06 months, p=0.30). Peripheral neuropathy was the most common adverse event (78% all grades, 18% grade 3). No grade 3 hematologic toxicity was registered. Treatment was discontinued in 6 patients (20%) – 4 due to peripheral neuropathy and two because of toxicoderma. Conclusions: In our sample, WP was an active and safe regimen in heavily pretreated platinum-resistant ovarian carcinoma. WP was well tolerated in elderly patients. The presence of ascites was associated to a shorter PFS in patients treated with WP compared to ascites-free patients.

Identification of epigenetic markers in circulating tumor DNA for early detection of high-grade serous ovarian carcinoma

2020 ◽  
Vol 159 ◽  
pp. 98-99
Author(s):  
H. Miller ◽  
D.N. Buckley ◽  
G.C. Gooden ◽  
M.A. Spillman ◽  
L.D. Roman ◽  
...  
Keyword(s):  
Early Detection ◽  
Ovarian Carcinoma ◽  
Circulating Tumor Dna ◽  
High Grade ◽  
Epigenetic Markers ◽  
Serous Ovarian Carcinoma ◽  
Tumor Dna

scholarly journals PEDT-03 A clinical trial of dendritic cell-based immunotherapy for refractory brain tumors in children

2020 ◽  
Vol 2 (Supplement_3) ◽  
pp. ii9-ii9
Author(s):  
Yasuharu Akasaki ◽  
Masayoshi Yamaoka ◽  
Jun Takei ◽  
Yuichirou Nonaka ◽  
Tatsuya Hirotsu ◽  
...  
Keyword(s):  
Overall Survival ◽  
Brain Tumor ◽  
Brain Tumors ◽  
Tumor Cells ◽  
Multidisciplinary Treatment ◽  
Progression Free Survival ◽  
Cervical Region ◽  
High Grade ◽  
Free Survival ◽  
Dismal Prognosis

Abstract Background/Objectives: Relapse or refractory brain tumor in childhood continue to have a dismal prognosis in spite of developing multidisciplinary treatment. Cancer immunotherapy is newly expected as next promising treatment for highly aggressive pediatric cancer. This trial was designed to evaluate the safety and clinical responses to an immunotherapy with fusions of dendritic cells (DCs) and tumor cells in patients with malignant brain tumors. Design/Methods: Patients with histopathologically confirmed high-grade or recurrent brain tumor were eligible for our immunotherapy. Autologous cultured tumor cells obtained from surgical specimens were fused with autologous DCs using polyethylene glycol. The fusion cells (FC) were inoculated intradermally in the cervical region and repeated 3–10 times in each 28–84 days cycle. Toxicity, progression-free survival (PFS), and overall survival (OS) of this trial were evaluated. Results: Six patients were enrolled, three with high grade glioma and three with ependymoma. Median age at first course of immunotherapy was 10 years (range 8–25 years) and median time of follow-up from first course of immunotherapy was 13.5 months (range 3–33 months). All patients with immunotherapy were well tolerated and no adverse event without local erythema in injected site. Median progression free survival and overall survival were 18 months and 18.5 months, respectively. Conclusions: FC immunotherapy with autologous DCs and tumor cells for brain tumor in children and young adults were extremely well tolerated and encouraging. Further phase II study of FC immunotherapy is planned to improve prognosis and overcome treatment related neurological sequelae for highly malignant tumors.

BRCA Reversion Mutations in Circulating Tumor DNA Predict Primary and Acquired Resistance to the PARP Inhibitor Rucaparib in High-Grade Ovarian Carcinoma

2018 ◽  
Vol 9 (2) ◽  
pp. 210-219 ◽  
Author(s):  
Kevin K. Lin ◽  
Maria I. Harrell ◽  
Amit M. Oza ◽  
Ana Oaknin ◽  
Isabelle Ray-Coquard ◽  
...  
Keyword(s):  
Ovarian Carcinoma ◽  
Parp Inhibitor ◽  
Acquired Resistance ◽  
Circulating Tumor Dna ◽  
High Grade ◽  
Tumor Dna

scholarly journals Meta-analysis of the studies dedicated to the predictive significance of circulating tumor DNA in pancreatic cancer

2020 ◽  
Vol 22 (3) ◽  
pp. 127-132
Author(s):  
A. S. Popova ◽  
M. Yu. Fedyanin ◽  
I. A. Pokataev ◽  
S. A. Tyulyandin
Keyword(s):  
Pancreatic Cancer ◽  
Overall Survival ◽  
Confidence Interval ◽  
Meta Analysis ◽  
Progression Free Survival ◽  
Circulating Tumor Dna ◽  
Poor Overall Survival ◽  
Risk Of Mortality ◽  
Before And After ◽  
Tumor Dna

The method of liquid biopsy allows detection of circulating tumor DNA (ctDNA) in patient blood, but the clinical significance of this approach in pancreatic cancer is still unclear. In this regard, we have carried out a meta-analysis of the studies dedicated to the predictive significance of ctDNA in pancreatic cancer. Materials and methods.We carried out the search for the articles and abstracts in PubMed, ASCO and ESMO databases published before February 2020, containing data about the connection between ctDNA and the prognosis of pancreatic cancer. The exclusion criteria were the studies including 10 or less participating patients, absence of the data about the relative risk of mortality and/or progression, and the 95% confidence interval. The meta-analysis was carried out by using the Review Manager software (RevMan), Version 5.3. Results.There were no significant systematic errors associated with the publications. The presence of ctDNA in patient blood showed poor overall survival of patients (odds ratio OR 2.21, 95% confidence interval CI 1.35-3.33,p=0.001) regardless of the prevalence of the disease. In case of the resectable process, the detection of ctDNA in patient blood both before and after surgery was a factor of worse progression-free survival (OR 2.32, 95% CI 1.543.5,p0.001 and OR 3.06, 95% CI 1.635.76,р=0.0005 and overall survival (OR2.01, 95% CI 1.123.63,р=0,02 and OR 3.39, 95% CI 2.125.44,р0.00001, respectively). Conclusions.The detection of ctDNA in the bloodstream in pancreatic cancer patients is a factor of poor prognosis in both localized and advanced cancer. It is very important to make further prospective studies to develop the optimal protocol for detecting ctDNA in patient bloodstream.

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