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  • 1
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    ETMR-22. TITLE: DEFINING THE CLINICAL AND PROGNOSTIC LANDSCAPE OF EMBRYONAL TUMORS WITH MULTI-LAYERED ROSETTES (ETMRs), A RARE BRAIN TUMOR REGISTRY (RBTC) STUDY
    Oxford University Press (OUP) ; 2020
    In:  Neuro-Oncology Vol. 22, No. Supplement_3 ( 2020-12-04), p. iii327-iii328
    Details
    In: Neuro-Oncology, Oxford University Press (OUP), Vol. 22, No. Supplement_3 ( 2020-12-04), p. iii327-iii328
    Abstract: ETMR, an aggressive disease characterised by C19MC alterations, were previously categorised as various histologic diagnoses. The clinical spectrum and impact of conventional multi-modal therapy on this new WHO diagnostic category remains poorly understood as a majority of ~200 cases reported to date lack molecular confirmation. We undertook comprehensive clinico-pathologic studies of a large molecularly confirmed cohort to improve disease recognition and treatment approaches. Amongst 623 CNS-PNETs patients enrolled in the RBTC registry, 159 primary ETMRs were confirmed based on a combination of FISH (125), methylation analysis (88), SNP and RNAseq (32) analyses; 91% had C19MC amplification/gains/fusions, 9% lacked C19MC alterations but had global methylation features of ETMR NOS. ETMRs arose in young patients (median age 26 months) predominantly as localized disease (M0-72%, M2-3 -18%) at multiple locations including cerebrum (60%) cerebellum (18%), midline structures (6%); notably 10% were brainstem primaries mimicking DIPG. Uni-and multivariate analyses of clinical and treatment details of curative regimens available for 110 patients identified metastatic disease (p=0.002), brainstem locations(p=0.005), extent of surgery, receipt of multi-modal therapy including high dose chemotherapy and radiation (P & lt;0.001) as significant treatment prognosticators, while C19MC status, age and gender were non-significant risk factors. Analyses of events in all patients showed respective EFS at 3 and 12 months of 84%(95%CI:77–91) and 37%(95%CI:20–41) and 4yr OS of 27%(95%CI:18–37) indicating despite intensified therapies ETMR is a rapidly progressive and fatal disease. Our comprehensive data on the largest cohort of molecularly-confirmed ETMRs provides a critical framework to guide current clinical management and development of clinical trials.
    Type of Medium: Online Resource
    ISSN: 1522-8517 , 1523-5866
    URL: Article
    DOI: 10.1093/neuonc/noaa222.225
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2020
    detail.hit.zdb_id: 2094060-9
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  • 2
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    MBCL-24. CAN YOUNG CHILDREN WITH RELAPSED MEDULLOBLASTOMA BE SALVAGED AFTER INITIAL IRRADIATION-SPARING APPROACHES?
    Oxford University Press (OUP) ; 2020
    In:  Neuro-Oncology Vol. 22, No. Supplement_3 ( 2020-12-04), p. iii393-iii393
    Details
    In: Neuro-Oncology, Oxford University Press (OUP), Vol. 22, No. Supplement_3 ( 2020-12-04), p. iii393-iii393
    Abstract: Irradiation-sparing approaches are used in young children with medulloblastoma (MB) given the vulnerability of the developing brain to neurocognitive impairment. Limited data are available following relapse for these patients. We aimed to describe the management and outcomes of young children with MB who relapsed after initial treatment without craniospinal irradiation (CSI). METHODS International retrospective study including patients with MB diagnosed between 1995–2017, ≤ 72 months old, initially treated without CSI, who subsequently relapsed. RESULTS Data are available for 52 patients (32 male). Median age at initial diagnosis was 27 months (range, 6–72) with 24 being metastatic. Initial therapy included conventional chemotherapy alone or high-dose chemotherapy (HDC) in 21 and 31 subjects, respectively. Three received upfront focal irradiation. Molecular subgrouping, available for 24 tumors, included 9 SHH and 15 non-WNT/non-SHH. Median time to relapse was 13 months (range, 3–63). Relapse was local, disseminated or combined in 20, 15, and 16, respectively. Salvage therapy with curative intent was given in 42/52 patients, including CSI in 28 subjects (median dose 36Gy, 18–41.4) or focal irradiation in 5 others. Three received HDC only. At a median follow-up time of 46 months (range, 4–255), 25 (48%) were alive, including 7/9 SHH and 7/15 non-WNT/non-SHH. The 2- and 5-year OS was 67% and 56% (SE, 7%), respectively. Two of 3 patients with SHH who did not receive salvage radiotherapy are survivors. CONCLUSION A substantial proportion of young children who relapse following irradiation-sparing strategies can be salvaged. Neurocognitive and ototoxicity outcomes are being evaluated.
    Type of Medium: Online Resource
    ISSN: 1522-8517 , 1523-5866
    URL: Article
    DOI: 10.1093/neuonc/noaa222.500
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2020
    detail.hit.zdb_id: 2094060-9
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  • 3
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    DIPG-74. RE-IRRADIATION OF DIPG: DATA FROM THE INTERNATIONAL DIPG REGISTRY
    Oxford University Press (OUP) ; 2020
    In:  Neuro-Oncology Vol. 22, No. Supplement_3 ( 2020-12-04), p. iii301-iii302
    Details
    In: Neuro-Oncology, Oxford University Press (OUP), Vol. 22, No. Supplement_3 ( 2020-12-04), p. iii301-iii302
    Abstract: To review data from DIPG Registry patients recorded to have received a second course of radiation therapy (rRT). METHODS The International DIPG Registry was searched for patients with DIPG who were treated with a known dose of rRT. Doses of rRT, timing from initial diagnosis and primary radiation therapy (pRT), radiographic response to rRT and survival from diagnosis (OS) were evaluated. RESULTS Sixty (11.2%) of 535 Registry patients underwent rRT; dose was provided for 44 patients. Median (range) data from those 44 revealed that rRT was given at 12 (2–65) months from initial diagnosis of DIPG and at 9.6 (1–61) months from completion of pRT at a dose of 26.7 (1.8–74) Gy. After completion of rRT, MRI showed response, progression, stable disease or was not available in 19, 8, 3 and 14 patients, respectively. Median PFS and OS were 11 and 18.1 months, respectively. 475 Registry patients did not undergo rRT; their ages, duration of symptoms, and primary treatment with or without chemotherapy were not significantly different from the rRT cohort. Median PFS and OS for the non-rRT patients were 6.9 and 10 months, respectively. rRT patients were more likely to have had radiographic evidence of tumor necrosis at diagnosis than non-rRT patients. CONCLUSIONS Administration of rRT to patients with DIPG has been inconsistent with respect to timing and dose. Toxicity, response and quality of life data are incomplete, but survival appears to be lengthened with rRT. Prospective clinical trials will elucidate benefits and risks of rRT.
    Type of Medium: Online Resource
    ISSN: 1522-8517 , 1523-5866
    URL: Article
    DOI: 10.1093/neuonc/noaa222.116
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2020
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  • 4
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    NCOG-47. CAN YOUNG CHILDREN WITH RELAPSED MEDULLOBLASTOMA BE SALVAGED AFTER INITIAL IRRADIATION-SPARING APPROACHES?
    Oxford University Press (OUP) ; 2020
    In:  Neuro-Oncology Vol. 22, No. Supplement_2 ( 2020-11-09), p. ii139-ii140
    Details
    In: Neuro-Oncology, Oxford University Press (OUP), Vol. 22, No. Supplement_2 ( 2020-11-09), p. ii139-ii140
    Abstract: Irradiation-sparing approaches are used in young children with medulloblastoma (MB) given the vulnerability of the developing brain to neurocognitive impairment. Limited data are available following relapse for these patients. We aimed to describe the management and outcomes of young children with MB who relapsed after initial treatment without craniospinal irradiation (CSI). METHODS International retrospective study including patients with MB diagnosed between 1995-2017, ≤ 72 months old, initially treated without CSI, who subsequently relapsed. RESULTS Data are available for 66 patients. The median age at initial diagnosis was 27 months (range, 6-72). At diagnosis, 27 patients had metastatic disease. Initial therapy included conventional chemotherapy or with high-dose chemotherapy (HDC) in 30 and 36 patients, respectively. Eight (12.1%) received upfront focal irradiation. Molecular subgrouping was available for 27 (41%) patients. Ten were SHH, five group 3, six group 4 and six others were non-WNT/non-SHH. The median time from initial diagnosis to relapse was 13 months (range, 3-63). Relapse was local, disseminated, or combined in 39%, 32%, and 29%, respectively. The median time to death from relapse was 18 months. Curative intent therapy was given in 53 patients with irradiation (81%), conventional chemotherapy without HDC (40%), and HDC (25%). For patients who received irradiation, 85% received CSI (median dose 33 Gy, 18-41.4) and 15% focal irradiation. Ten patients received chemotherapy without salvage irradiation. The median follow-up time was 44 months (range, 4-255), 33 (62%) patients who underwent curative-intent therapy were alive, including 8/10 SHH, 2/3 group 3, 2/6 group 4, and 4/5 non-WNT/non-SHH. Three of four patients with SHH and treated without salvage radiotherapy are survivors. The 5-year OS for curative intent was 70%. CONCLUSION A substantial proportion of young children who relapse following irradiation-sparing strategies can be salvaged. A proportion of children with SHH MB can be salvaged without salvage radiotherapy.
    Type of Medium: Online Resource
    ISSN: 1522-8517 , 1523-5866
    URL: Article
    DOI: 10.1093/neuonc/noaa215.585
    Language: English
    Publisher: Oxford University Press (OUP)
    Publication Date: 2020
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  • 5
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    Outcomes of Infants and Young Children With Relapsed Medulloblastoma After Initial Craniospinal Irradiation–Sparing Approaches: An International Cohort Study
    American Society of Clinical Oncology (ASCO) ; 2023
    In:  Journal of Clinical Oncology Vol. 41, No. 10 ( 2023-04-01), p. 1921-1932
    Details
    In: Journal of Clinical Oncology, American Society of Clinical Oncology (ASCO), Vol. 41, No. 10 ( 2023-04-01), p. 1921-1932
    Abstract: Infant and young childhood medulloblastoma (iMB) is usually treated without craniospinal irradiation (CSI) to avoid neurocognitive late effects. Unfortunately, many children relapse. The purpose of this study was to assess salvage strategies and prognostic features of patients with iMB who relapse after CSI-sparing therapy. METHODS We assembled a large international cohort of 380 patients with relapsed iMB, age younger than 6 years, and initially treated without CSI. Univariable and multivariable Cox models of postrelapse survival (PRS) were conducted for those treated with curative intent using propensity score analyses to account for confounding factors. RESULTS The 3-year PRS, for 294 patients treated with curative intent, was 52.4% (95% CI, 46.4 to 58.3) with a median time to relapse from diagnosis of 11 months. Molecular subgrouping was available for 150 patients treated with curative intent, and 3-year PRS for sonic hedgehog (SHH), group 4, and group 3 were 60%, 84%, and 18% ( P = .0187), respectively. In multivariable analysis, localized relapse ( P = .0073), SHH molecular subgroup ( P = .0103), CSI use after relapse ( P = .0161), and age ≥ 36 months at initial diagnosis ( P = .0494) were associated with improved survival. Most patients (73%) received salvage CSI, and although salvage chemotherapy was not significant in multivariable analysis, its use might be beneficial for a subset of children receiving salvage CSI 〈 35 Gy ( P = .007). CONCLUSION A substantial proportion of patients with relapsed iMB are salvaged after initial CSI-sparing approaches. Patients with SHH subgroup, localized relapse, older age at initial diagnosis, and those receiving salvage CSI show improved PRS. Future prospective studies should investigate optimal CSI doses and the role of salvage chemotherapy in this population.
    Type of Medium: Online Resource
    ISSN: 0732-183X , 1527-7755
    URL: Article
    DOI: 10.1200/JCO.21.02968
    RVK:
    XA 52760
    RVK:
    XA 10000
    Language: English
    Publisher: American Society of Clinical Oncology (ASCO)
    Publication Date: 2023
    detail.hit.zdb_id: 2005181-5
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  • 6
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    Choroid plexus tumors in children less than 36 months: the Canadian Pediatric Brain Tumor Consortium (CPBTC) experience
    Springer Science and Business Media LLC ; 2011
    In:  Child's Nervous System Vol. 27, No. 2 ( 2011-2), p. 259-264
    Details
    In: Child's Nervous System, Springer Science and Business Media LLC, Vol. 27, No. 2 ( 2011-2), p. 259-264
    Type of Medium: Online Resource
    ISSN: 0256-7040 , 1433-0350
    URL: Article
    DOI: 10.1007/s00381-010-1269-9
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2011
    detail.hit.zdb_id: 1463024-2
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  • 7
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    Phase II Weekly Vinblastine for Chemotherapy-Naïve Children With Progressive Low-Grade Glioma: A Canadian Pediatric Brain Tumor Consortium Study
    American Society of Clinical Oncology (ASCO) ; 2016
    In:  Journal of Clinical Oncology Vol. 34, No. 29 ( 2016-10-10), p. 3537-3543
    Details
    In: Journal of Clinical Oncology, American Society of Clinical Oncology (ASCO), Vol. 34, No. 29 ( 2016-10-10), p. 3537-3543
    Abstract: Vinblastine monotherapy has shown promising activity and a low-toxicity profile in patients with pediatric low-grade glioma (PLGG) who experienced treatment failure after initial treatment with chemotherapy and/or radiation. The aim of this study was to assess the activity of vinblastine in therapy-naïve children. Patients and Methods Patients 〈 18 years old with unresectable and/or progressive therapy-naïve PLGG were eligible. Vinblastine was administered once per week at a dose of 6 mg/m 2 intravenously over a period of 70 weeks. Vision, quality of life, neurofibromatosis type 1 (NF1) status, and BRAF mutation/fusion status were also determined and correlated with outcome. Results Fifty-four patients were enrolled onto the study, with a median age of 8 years (range, 0.7 to 17.2 years). Most patients had chiasmatic/hypothalamic tumors (55.5%), and 13 patients (24.1%) had NF1. The most common histology was pilocytic astrocytoma (46.3%). Seventeen patients were diagnosed using radiologic criteria alone. Best response to chemotherapy was centrally reviewed with a response rate (complete, partial, or minor response) of 25.9%. Disease stabilization (complete, partial, or minor response or stable disease) was achieved in 47 patients (87.0%). Visual improvement was observed in 20% of patients with optic pathway glioma. Five-year overall survival and progression-free survival (PFS) rates were 94.4% (95% CI, 88.5% to 100%) and 53.2% (95% CI, 41.3% to 68.5%), respectively, for the entire cohort. Patients with NF1 had a significantly better PFS (85.1%; 95% CI, 68.0% to 100%) when compared with patients without NF1 (42.0%; 95% CI, 29.1% to 60.7%; P = .012). Age 〈 3 years or 〉 10 years was not associated with poor outcome. Treatment was well tolerated, and quality of life was not affected during treatment. In this trial, there was no correlation between BRAF alterations and outcome. Conclusion Vinblastine administered once per week is well tolerated in children with treatment naïve PLGG. Overall survival and PFS are comparable to current therapies, with a favorable toxicity profile and a maintained quality of life.
    Type of Medium: Online Resource
    ISSN: 0732-183X , 1527-7755
    URL: Article
    DOI: 10.1200/JCO.2016.68.1585
    RVK:
    XA 52760
    RVK:
    XA 10000
    Language: English
    Publisher: American Society of Clinical Oncology (ASCO)
    Publication Date: 2016
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  • 8
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    A phase 2 study of trametinib for patients with pediatric glioma or plexiform neurofibroma with refractory tumor and activation of the MAPK/ERK pathway.
    American Society of Clinical Oncology (ASCO) ; 2022
    In:  Journal of Clinical Oncology Vol. 40, No. 16_suppl ( 2022-06-01), p. 2042-2042
    Details
    In: Journal of Clinical Oncology, American Society of Clinical Oncology (ASCO), Vol. 40, No. 16_suppl ( 2022-06-01), p. 2042-2042
    Abstract: 2042 Background: Pediatric low-grade gliomas (PLGG) are the most frequent brain tumors in children and the majority of PLGG have activation of the MAPK/ERK pathway. Plexiform neurofibromas (PN) are found in up to 50% of patients with neurofibromatosis type 1 (NF1). Trametinib has been used widely to treat PLGG and PN, but no clinical trial has reported its efficacy. Methods: This multicenter phase II trial includes patients aged ≥ 1 month to ≤ 25 years with progressing/refractory PLGG groups or PN. The primary objective was to evaluate the overall response rate after daily oral trametinib administration for eighteen 28-day cycles. Results: As of January 31 st , 2022, 60 patients with PLGG and 45 patients with PN have been enrolled. Median age is 9.5 years (range 1.8-25.4) for PLGG and 11 years (range 0.7-19.8) for PN. Median follow-up is 18 months (range 0.1-38.1). Fifty-three patients with PLGG were evaluable. The overall response includes: 1 complete response (CR) (1.9%), 7 partial response PR (13.2%), 17 minor response MR (32.1%), 23 stable disease (SD) (43.4%) and 5 progressive disease (PD) (9.4%). Twenty-eight patients with a total of 32 PN were available for volumetric analysis. Volumetric assessment demonstrated an overall response rate of 60.7% compared to 24.1% when using RECIST 1.1 and 62.5% of PN showed a decrease of more than 20% in volume. Median volume change was a decrease of 30% (range -93.5 to 14.3). A total of 59 (69.4%) patients discontinued treatment as planned after 18 cycles and 9 (10.6%) patients had to stop trametinib due to adverse events. Conclusions: Response rates observed in our study suggest that trametinib is a potentially effective targeted therapy for patients with recurrent/refractory PLGG and PN. Treatment was overall well tolerated. This trial will continue to gather data on duration of response and long-term outcome for PLGG and PN treated with trametinib. Clinical trial information: NCT03363217.
    Type of Medium: Online Resource
    ISSN: 0732-183X , 1527-7755
    URL: Article
    DOI: 10.1200/JCO.2022.40.16_suppl.2042
    RVK:
    XA 52760
    RVK:
    XA 10000
    Language: English
    Publisher: American Society of Clinical Oncology (ASCO)
    Publication Date: 2022
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  • 9
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    A phase 2 study of trametinib for patients with pediatric glioma or plexiform neurofibroma with refractory tumor and activation of the MAPK/ERK pathway: TRAM-01
    Springer Science and Business Media LLC ; 2019
    In:  BMC Cancer Vol. 19, No. 1 ( 2019-12)
    Details
    In: BMC Cancer, Springer Science and Business Media LLC, Vol. 19, No. 1 ( 2019-12)
    Abstract: Pediatric low-grade gliomas (PLGG) are the most frequent brain tumors in children. Up to 50% will be refractory to conventional chemotherapy. It is now known that the majority of PLGG have activation of the MAPK/ERK pathway. The same pathway is also activated in plexiform neurofibromas (PNs) which are low-grade tumors involving peripheral nerves in patients with neurofibromatosis type 1 (NF1). These lesions are known to be refractory to chemotherapy. Specific MEK inhibitors such as trametinib are now available and have been approved for other cancers harboring mutations in the MAPK/ERK pathway such as melanoma. We have observed significant responses to trametinib in patients with refractory PLGG in our institutions and results from the phase I study are promising. The treatment appears not only efficacious but is also usually well tolerated. We hypothesize that we will observe responses in the majority of refractory PLGG and PN treated with trametinib in this phase 2 study. Methods The primary objective is to determine the objective response rate of trametinib as a single agent for treatment of progressing/refractory tumors with MAPK/ERK pathway activation. The TRAM-01 study is a phase II multicentric open-label basket trial including four groups. Group 1 includes NF1 patients with progressing/refractory glioma. Group 2 includes NF1 patients with plexiform neurofibroma. Group 3 includes patients with progressing/refractory glioma with KIAA1549-BRAF fusion. Group 4 includes other patients with progressing/refractory glioma with activation of the MAPK/ERK pathway. Eligible patients for a given study group will receive daily oral trametinib at full dose for a total of 18 cycles of 28 days. A total of 150 patients will be enrolled in seven Canadian centers. Secondary objectives include the assessment of progression-free survival, overall survival, safety and tolerability of trametinib, serum levels of trametinib and evaluation of quality of life during treatment. Discussion Trametinib will allow us to target directly and specifically the MAPK/ERK pathway. We expect to observe a significant response in most patients. Following our study, trametinib could be integrated into standard treatment of PLGG and PN. Trial registration ClinicalTrials.gov Identifier: NCT03363217 December 6, 2017.
    Type of Medium: Online Resource
    ISSN: 1471-2407
    URL: Article
    DOI: 10.1186/s12885-019-6442-2
    Language: English
    Publisher: Springer Science and Business Media LLC
    Publication Date: 2019
    detail.hit.zdb_id: 2041352-X
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  • 10
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    ACNS1221: A phase II study for the treatment of non metastatic desmoplastic medulloblastoma in children less than 4 years of age—A report from the Children Oncology Group.
    American Society of Clinical Oncology (ASCO) ; 2017
    In:  Journal of Clinical Oncology Vol. 35, No. 15_suppl ( 2017-05-20), p. 10505-10505
    Details
    In: Journal of Clinical Oncology, American Society of Clinical Oncology (ASCO), Vol. 35, No. 15_suppl ( 2017-05-20), p. 10505-10505
    Abstract: 10505 Background: Nodular desmoplastic medulloblastoma and medulloblastoma with extensive nodularity (ND/MBEN) have been associated with a more favorable outcome in younger children. However, treatment-related neurotoxicity remains a significant concern in this vulnerable group of patients. Methods: We prospectively conducted a single-arm multicenter trial of conventional chemotherapy for non-metastatic ND/MBEN, based on a modified HIT SKK2000 regimen excluding the use of intraventricular methotrexate (MTX) injection, with the aim to achieve a similar outcome with reduced treatment related neurotoxicity. The design required 37 patients and targeted a 2-year PFS of ≥ 90%. Secondary objectives included evaluation of feasibility of timely central pathology review, prospective evaluation of the cohort’s molecular profile and neurocognitive outcomes. Results: Between 12/2013 and 07/2016, 26 patients were enrolled, including 16 males and 10 females, diagnosed at a median age of 19.7 months (7.1-42.9 months). Four patients had residual disease at baseline. There were 19 ND and 7 MBEN medulloblastoma, confirmed by central pathology review. All cases were reviewed within 10 days by at least 2 of the 3 neuropathologists. The study was closed early following interim analysis due to a higher than expected relapse rate. At last follow-up, 7 patients had relapsed (3 local, 2 distant and 2 combined) at a median time of 9.7 months from diagnosis (range, 9.5-13.7 months). One patient subsequently died of disease. The current median follow-up for the 25 survivors is 1 year (range, 0.2-1.9 years) and the 1 year PFS rate is 66.2% (SE 12.2%). Based on the currently available information, older age (p = 0.07) and ND histology (p = 0.009) appear to be associated with worse PFS. To date none of the patients with MBEN histology have relapsed. Conclusions: The proposed modified regimen of chemotherapy without intraventricular MTX failed to achieve the desirable 2 y PFS of 90%, leading to premature closure of the study. Ongoing molecular characterization of the cohort may help uncover patients who may still benefit from this regimen. Clinical trial information: NCT02017964.
    Type of Medium: Online Resource
    ISSN: 0732-183X , 1527-7755
    URL: Article
    DOI: 10.1200/JCO.2017.35.15_suppl.10505
    RVK:
    XA 52760
    RVK:
    XA 10000
    Language: English
    Publisher: American Society of Clinical Oncology (ASCO)
    Publication Date: 2017
    detail.hit.zdb_id: 2005181-5
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