Temozolomide and radiotherapy in newly diagnosed glioblastoma patients: O6-methylguanine-DNA methyltransferase (MGMT) promotor methylation status and Ki-67 as biomarkers for survival and response to treatment

2012 ◽  
Vol 11 (3) ◽  
pp. 168-176 ◽  
Author(s):  
Khaled Abdel Karim ◽  
M. M. El Mahdy ◽  
M. M. Abdel Wahab ◽  
L. R. Ezz EI Arab ◽  
A. El Shehaby ◽  
...  
Keyword(s):  
Dna Methyltransferase ◽  
Methylation Status ◽  
Response To Treatment ◽  
Newly Diagnosed ◽  
Ki 67 ◽  
Methylguanine Dna Methyltransferase ◽  
Newly Diagnosed Glioblastoma

scholarly journals NIMG-37. DELAYED PSEUDOPROGRESSION IN TWO PATIENTS UNDERGOING TTFIELDS TREATMENT FOR NEWLY DIAGNOSED GLIOBLASTOMA

2020 ◽  
Vol 22 (Supplement_2) ◽  
pp. ii155-ii156
Author(s):  
Allison Lowman ◽  
Sarah Hurrell ◽  
Samuel Bobholz ◽  
Jennifer Connelly ◽  
Elizabeth Cochran ◽  
...  
Keyword(s):  
Dna Methyltransferase ◽  
Radiographic Progression ◽  
Methylation Status ◽  
Underlying Mechanism ◽  
Recurrent Glioblastoma ◽  
Newly Diagnosed ◽  
Methylguanine Dna Methyltransferase ◽  
Specific Effects ◽  
Newly Diagnosed Glioblastoma ◽  
Associated Risk Factors

Abstract PURPOSE Tumor treatment fields (TTFields) are approved by the FDA for newly diagnosed as well as recurrent glioblastoma (GBM). TTFields have been shown to extend survival by 4.9 months in newly diagnosed GBM, and a landmark overall survival rate of 13% at 5 years. However, the specific effects remain widely unknown, which has prevented widespread clinical use of this treatment. METHODS This case study examines two glioblastoma patients, IDH-1 wildtype, MGMT unmethylated, that received TTFields (Optune) in addition to maintenance temozolomide (TMZ) following radiation (RT). Both cases were followed using standard MR imaging. Second resections were performed due to radiographic progression of contrast enhancement. RESULTS Although imaging was concerning for tumor progression, pathology showed only treatment effect, ultimately leading to the diagnosis of pseudoprogression. Both patients fell outside the normal expected timeline for chemo-radiation induced pseudoprogression. Based on the pathology, both patients resumed treatment with TMZ/TTFields. One patient expired at 25 months and one is still alive. CONCLUSIONS Pathologic confirmation was essential for guiding further treatment and allowed patients to continue treatment that was effective despite contrary indications on imaging. These findings suggest that pathological confirmation should be strongly considered in patients receiving TMZ/TTFields who develop radiographic progression, potentially with a less invasive biopsy procedure. Future studies should look to characterize the underlying mechanism of interaction between TTFields/TMZ and quantify the prevalence, associated risk factors and whether there is a genotype more susceptible. Both patients reported here had O(6)-methylguanine-DNA methyltransferase (MGMT) unmethylated GBM, and while about 60% of glioblastomas are diagnosed likewise, it is possible that MGMT methylation status plays a role in TTFields response. Better characterization of this phenomenon will improve treatment guidance, potentially reducing unnecessary surgeries and the discontinuance of successful therapies.

MGMT promotor methylation status and Ki-67 in correlation to survival and response to treatment with temozolamide and radiotherapy in newly diagnosed glioblastoma patients.

2010 ◽  
Vol 28 (15_suppl) ◽  
pp. e12504-e12504
Author(s):  
M. M. Abdel Wahab ◽  
L. R. Ezz El Arab ◽  
K. Abdel Karim ◽  
M. El Mahdy ◽  
M. A. Osman ◽  
...  
Keyword(s):  
Methylation Status ◽  
Response To Treatment ◽  
Newly Diagnosed ◽  
Ki 67 ◽  
Newly Diagnosed Glioblastoma

scholarly journals Patients Affected by Unmethylated O(6)-Methylguanine-DNA Methyltransferase Glioblastoma Undergoing Radiochemotherapy May Benefit from Moderately Dose-Escalated Radiotherapy

2017 ◽  
Vol 2017 ◽  
pp. 1-7 ◽  
Author(s):  
Paolo Tini ◽  
Valerio Nardone ◽  
Pierpaolo Pastina ◽  
Giuseppe Battaglia ◽  
Clelia Miracco ◽  
...  
Keyword(s):  
Dna Methyltransferase ◽  
Methylation Status ◽  
Disease Free Survival ◽  
Newly Diagnosed ◽  
Mgmt Methylation ◽  
Free Survival ◽  
Methylguanine Dna Methyltransferase ◽  
Therapeutic Results ◽  
Newly Diagnosed Glioblastoma ◽  
Disease Free

Purpose. To compare the therapeutic results of two radiotherapy (RT) dose schedules in combined temozolomide- (TMZ-) RT treatment in newly diagnosed glioblastoma (GB), according to the O(6)-methylguanine-DNA methyltransferase (MGMT) methylation status.Material and Method. Patients received either standard (60 Gy) or moderately escalated dose (70 Gy) radiotherapy (RT) with concomitant and adjuvant TMZ between June 2006 and October 2013. We retrospectively evaluated the therapeutic effectiveness of RT schedules in terms of Overall Survival (OS) and Progression-Disease Free Survival (PDFS) analyzing the MGMT methylation status.Results. One hundred and seventeen patients were selected for the present analysis. Seventy-two out of the selected cases received the standard RT-TMZ course (SDRT-TMZ) whereas the remaining 45 underwent the escalated schedule (HDRT-TMZ). The analysis according to the MGMT promoter methylation status showed that, in unmethylated-MGMT GB patients, HDRT-TMZ and SDRT-TMZ groups had different median OS (p=0,01) and PDFS (p=0,007), that is, 8 months and 5 months for the SDRT-TMZ group and 14 months and 9 months for the HDRT-TMZ group, respectively. No difference in survival outcomes was found in methylated MGMT patients according to the two RT schedules (p=0,12).Conclusions. In our experience, unmethylated-MGMT GB patients benefited from a moderately escalated dose of RT plus TMZ.

scholarly journals Limited role for extended maintenance temozolomide for newly diagnosed glioblastoma

Neurology ◽  
2017 ◽  
Vol 88 (15) ◽  
pp. 1422-1430 ◽  
Author(s):  
Dorothee Gramatzki ◽  
Philipp Kickingereder ◽  
Bettina Hentschel ◽  
Jörg Felsberg ◽  
Ulrich Herrlinger ◽  
...  
Keyword(s):  
Dna Methyltransferase ◽  
Proportional Hazards Model ◽  
Methylation Status ◽  
Residual Tumor ◽  
Cox Proportional Hazards Model ◽  
Rank Test ◽  
Karnofsky Performance Score ◽  
Newly Diagnosed ◽  
Clinical Patient ◽  
Newly Diagnosed Glioblastoma

Objective:To explore an association with survival of modifying the current standard of care for patients with newly diagnosed glioblastoma of surgery followed by radiotherapy plus concurrent and 6 cycles of maintenance temozolomide chemotherapy (TMZ/RT → TMZ) by extending TMZ beyond 6 cycles.Methods:The German Glioma Network cohort was screened for patients with newly diagnosed glioblastoma who received TMZ/RT → TMZ and completed ≥6 cycles of maintenance chemotherapy without progression. Associations of clinical patient characteristics, molecular markers, and residual tumor determined by magnetic resonance imaging after 6 cycles of TMZ with progression-free survival (PFS) and overall survival (OS) were analyzed with the log-rank test. Multivariate analyses using the Cox proportional hazards model were performed to assess associations of prolonged TMZ use with outcome.Results:Sixty-one of 142 identified patients received at least 7 maintenance TMZ cycles (median 11, range 7–20). Patients with extended maintenance TMZ treatment had better PFS (20.5 months, 95% confidence interval [CI] 17.7–23.3, vs 17.2 months, 95% CI 10.2–24.2, p = 0.035) but not OS (32.6 months, 95% CI 28.9–36.4, vs 33.2 months, 95% CI 25.3–41.0, p = 0.126). However, there was no significant association of prolonged TMZ chemotherapy with PFS (hazard ratio [HR] = 0.8, 95% CI 0.4–1.6, p = 0.559) or OS (HR = 1.6, 95% CI 0.8–3.3, p = 0.218) adjusted for age, extent of resection, Karnofsky performance score, presence of residual tumor, O6-methylguanine DNA methyltransferase (MGMT) promoter methylation status, or isocitrate dehydrogenase (IDH) mutation status.Conclusion:These data may not support the practice of prolonging maintenance TMZ chemotherapy beyond 6 cycles.Classification of evidence:This study provides Class III evidence that in patients with newly diagnosed glioblastoma, prolonged TMZ chemotherapy does not significantly increase PFS or OS.

scholarly journals HOUT-02. TREATMENT PATTERNS AND OUTCOMES FOR PATIENTS WITH NEWLY-DIAGNOSED GLIOBLASTOMA MULTIFORME IN A US COMMUNITY ONCOLOGY SETTING

2019 ◽  
Vol 21 (Supplement_6) ◽  
pp. vi112-vi112
Author(s):  
Alex Fu ◽  
Nicholas Robert ◽  
Trang Pham ◽  
Alexander Marshall ◽  
Srinivas Annavarapu
Keyword(s):  
Glioblastoma Multiforme ◽  
Clinical Outcomes ◽  
Dna Methyltransferase ◽  
Treatment Options ◽  
Methylation Status ◽  
Treatment Patterns ◽  
Newly Diagnosed ◽  
Mgmt Methylation ◽  
The Us ◽  
Newly Diagnosed Glioblastoma

Abstract BACKGROUND This study aims to describe real world characteristics and outcomes of newly-diagnosed glioblastoma multiforme (GBM) patients in relationship to O6-methylguanine DNA methyltransferase promoter (MGMT) testing and methylation status, in the US. METHODS Patients receiving care for GBM were identified in the US Oncology Network database from 1/1/2013 to 6/30/2018 and followed up to 9/30/2018. Structured data and chart reviews were used to assess demographic and clinical characteristics, treatment patterns, type of surgery, MGMT methylation, and clinical outcomes. RESULTS Of 600 patient charts planned for review, 195 have been randomly selected and reviewed thus far. Of these, 165 (84.6%) had surgical resection and 30 (15.4%) had biopsy only. Eighty-eight (45.1%) patients were tested for MGMT status and 107 (54.9%) were not. Of those tested, 33 (37.5%) were methylated, and 45 (51.1%) unmethylated. Median ages in the overall (including tested and untested), methylated and unmethylated cohorts were 63.7, 58.8, and 66.7 years, respectively. Most common first-line (1L) treatment in overall, methylated, and unmethylated cohorts was radiation concurrent with temozolomide received by 86.2%, 93.9%, and 91.1%, respectively. Median duration of 1L treatment in the overall cohort was 15.1 weeks (95% confidence interval [CI]: 11.9, 21.6) and higher in the methylated vs. unmethylated cohort (25.9 [18.1, 34.6] vs. 15.1 [9.3, 23.4] weeks, p=0.0375). Unadjusted median overall survival and progression-free survival in the overall cohort were 11.4 [9.4, 14.0] months and 5.2 [3.9, 5.8] months, and higher in the methylated vs. unmethylated cohort (20.5 [14.9, not realized] vs. 12.2 [7.1, 17.0] months, p=0.0052, and 9.4 [5.6, 14.0] vs. 5.5 [3.3, 6.8], p=0.0092, respectively). CONCLUSIONS Fewer than half of GBM patients were tested for MGMT methylation in the US community. Clinical outcomes, while better among patients with methylated MGMT, remain poor and current treatment options are limited.

scholarly journals Randomized Phase II Trial of Chemoradiotherapy Followed by Either Dose-Dense or Metronomic Temozolomide for Newly Diagnosed Glioblastoma

2009 ◽  
Vol 27 (23) ◽  
pp. 3861-3867 ◽  
Author(s):  
Jennifer L. Clarke ◽  
Fabio M. Iwamoto ◽  
Joohee Sul ◽  
Katherine Panageas ◽  
Andrew B. Lassman ◽  
...  
Keyword(s):  
Phase Ii ◽  
Dna Methyltransferase ◽  
Methylation Status ◽  
Progression Free Survival ◽  
Therapeutic Index ◽  
Newly Diagnosed ◽  
Randomized Phase Ii ◽  
Elevated Liver Enzymes ◽  
Newly Diagnosed Glioblastoma ◽  
Dose Dense

Purpose Alternative dosing schedules of temozolomide may improve survival in patients with newly diagnosed glioblastoma (GBM) by increasing the therapeutic index, overcoming common mechanisms of temozolomide resistance, or both. The goal of this randomized phase II study was to evaluate two different temozolomide regimens in the adjuvant treatment of newly diagnosed GBM. Patients and Methods Adult patients with newly diagnosed GBM were randomly assigned to receive standard radiotherapy with concurrent daily temozolomide followed by six adjuvant cycles of either dose-dense (150 mg/m2 days 1 to 7 and 15 to 21) or metronomic (50 mg/m2 continuous daily) temozolomide. Maintenance doses of 13-cis-retinoic acid were then administered until tumor progression. The primary end point was overall survival (OS) at 1 year. Tumor tissue was assayed to determine O6-methylguanine–DNA methyltransferase (MGMT) promoter methylation status. Results Eighty-five eligible patients were enrolled; 42 were randomly assigned to dose-dense and 43 to metronomic temozolomide. The 1-year survival rate was 80% for the dose-dense arm and 69% for the metronomic arm; median OS was 17.1 months (95% CI, 14.0 to 28.1 months) and 15.1 months (95% CI, 12.3 to 18.9 months), respectively. The most common toxicities were myelosuppression (leukopenia, neutropenia, and thrombocytopenia) and elevated liver enzymes. Pseudoprogression was observed in 37% of assessable patients and may have had an impact on estimates of progression-free survival (6.6 months in the dose-dense arm and 5.0 months in the metronomic arm). Conclusion Both dose-dense and metronomic temozolomide regimens were well tolerated with modest toxicity. The dose-dense regimen appears promising, with 1-year survival of 80%.

scholarly journals A phase I/II trial of 5-fraction stereotactic radiosurgery with 5-mm margins with concurrent temozolomide in newly diagnosed glioblastoma: primary outcomes

2020 ◽  
Vol 22 (8) ◽  
pp. 1182-1189 ◽  
Author(s):  
Melissa Azoulay ◽  
Steven D Chang ◽  
Iris C Gibbs ◽  
Steven L Hancock ◽  
Erqi L Pollom ◽  
...  
Keyword(s):  
Stereotactic Radiosurgery ◽  
Dna Methyltransferase ◽  
Progression Free Survival ◽  
Target Volume ◽  
Maximum Tolerated Dose ◽  
Newly Diagnosed ◽  
Survival Times ◽  
Methylguanine Dna Methyltransferase ◽  
Grade 5 ◽  
Newly Diagnosed Glioblastoma

Abstract Background We sought to determine the maximum tolerated dose (MTD) of 5-fraction stereotactic radiosurgery (SRS) with 5-mm margins delivered with concurrent temozolomide in newly diagnosed glioblastoma (GBM). Methods We enrolled adult patients with newly diagnosed glioblastoma to 5 days of SRS in a 3 + 3 design on 4 escalating dose levels: 25, 30, 35, and 40 Gy. Dose limiting toxicity (DLT) was defined as Common Terminology Criteria for Adverse Events grades 3–5 acute or late CNS toxicity, including adverse radiation effect (ARE), the imaging correlate of radiation necrosis. Results From 2010 to 2015, thirty patients were enrolled. The median age was 66 years (range, 51–86 y). The median target volume was 60 cm3 (range, 14.7–137.3 cm3). DLT occurred in 2 patients: one for posttreatment cerebral edema and progressive disease at 3 weeks (grade 4, dose 40 Gy); another patient died 1.5 weeks following SRS from postoperative complications (grade 5, dose 40 Gy). Late grades 1–2 ARE occurred in 8 patients at a median of 7.6 months (range 3.2–12.6 mo). No grades 3–5 ARE occurred. With a median follow-up of 13.8 months (range 1.7–64.4 mo), the median survival times were: progression-free survival, 8.2 months (95% CI: 4.6–10.5); overall survival, 14.8 months (95% CI: 10.9–19.9); O6-methylguanine-DNA methyltransferase hypermethylated, 19.9 months (95% CI: 10.5–33.5) versus 11.3 months (95% CI: 8.9–17.6) for no/unknown hypermethylation (P = 0.03), and 27.2 months (95% CI: 11.2–48.3) if late ARE occurred versus 11.7 months (95% CI: 8.9–17.6) for no ARE (P = 0.08). Conclusions The per-protocol MTD of 5-fraction SRS with 5-mm margins with concurrent temozolomide was 40 Gy in 5 fractions. ARE was limited to grades 1–2 and did not statistically impact survival.

O6-benzylguanine (BG) and temozolomide (TMZ) therapy of glioblastoma multiforme (GBM) with infusion of autologous lentiviral transduced P140KMGMT+ hematopoietic progenitors to protect hematopoiesis:  A phase I study.

2012 ◽  
Vol 30 (15_suppl) ◽  
pp. TPS1616-TPS1616
Author(s):  
Andrew E. Sloan ◽  
Jane Reese ◽  
Lisa R. Rogers ◽  
Simon S. Lo ◽  
Charles John Nock ◽  
...  
Keyword(s):  
Phase I ◽  
Dose Escalation ◽  
Phase I Study ◽  
Dna Methyltransferase ◽  
Primary Objective ◽  
Bone Marrow Toxicity ◽  
Newly Diagnosed ◽  
Methylguanine Dna Methyltransferase ◽  
Newly Diagnosed Glioblastoma

TPS1616 Background: The administration of radiation therapy (RT) and concomitant and adjuvant temozolomide (TMZ) for the treatment of newly-diagnosed glioblastoma (GBM) is associated with modestly prolonged survival. However, the benefit of concurrent therapy is restricted to a subgroup of patients whose tumor exhibits methylation of the promoter for methylguanine-DNA-methyltransferase (MGMT). Promoter methylation silences the expression of DNA alkyltransferase (AGT), the product of the MGMT gene which functions to repair alkylated DNA. Unfortunately, the majority of GBMs have non-methylated MGMT promoters and do not appear to benefit from adding TMZ to radiotherapy. Two potential strategies for targeting MGMT-induced chemoprotection in gliomas include depletion of tumor MGMT, and dose escalation of TMZ accomplished by minimizing TMZ-induced bone marrow toxicity. In this study, we propose to combine the irreversible MGMT inhibitor O6-benzylguanine (BG) with infusion of autologous hematopoetic stem cells (HSCs) transduced with lentiviral P140K-MGMT, an MGMT mutant which is highly resistant to inactivation by BG, with the intent to reduce or prevent the myelosuppressive effects of TMZ. The primary objective is to assess the safety and feasibility of combining these two strategies in patients with newly-diagnosed GBM. Methods: This is a three cohort, Phase I study for patients with newly resected supratentorial GBM. There will be at least four evaluable patients per cohort. Cohort 1 will receive standard RT and concomitant TMZ prior to infusion of autologous lentiviral P140K-MGMT transduced HSCs, followed by adjuvant TMZ. Cohort 2 will receive an induction dose of TMZ+BG followed by infusion of autologous LV-P140K-MGMT HSCs prior to concomitant RT +TMZ and adjuvant TMZ. Cohort 3 will include intra-patient dose escalation of TMZ in patients who exhibit detectable levels of P140K-MGMT marked cells in vivo, using the design (i.e. cohort 1 or 2) proven to be safest and most effective. The study is open and has accrued the first patient.

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