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REiNS: Reliability of Handheld Dynamometry to Measure Focal Muscle Weakness in Neurofibromatosis Types 1 and 2

Akshintala, Srivandana; Khalil, Nashwa; Yohay, Kaleb; Muzikansky, Alona; Allen, Jeffrey; Yaffe, Anna; Gross, Andrea M; Fisher, Michael J; Blakeley, Jaishri O; Oberlander, Beverly; Pudel, Miriam; Engelson, Celia; Obletz, Jaime; Mitchell, Carole; Widemann, Brigitte C; Stevenson, David A; Plotkin, Scott R
OBJECTIVE:To determine a suitable outcome measure for assessing muscle strength in neurofibromatosis type 1 (NF1) and type 2 (NF2) clinical trials, we evaluated the intra-observer reliability of hand-held dynamometry (HHD) and developed consensus recommendations for its use in neurofibromatosis clinical trials. METHODS:Patients ≥5 years with weakness in at least 1 muscle group by manual muscle testing (MMT) were eligible. Maximal isometric muscle strength of a weak muscle group and the biceps of the dominant arm were measured by HHD. An average of 3 repetitions per session was used as an observation, and 3 sessions with rest period between each were performed on the same day by a single observer. Intra- and inter-session intraclass correlation (ICC) and coefficient of variation (CV) were calculated to assess reliability and measurement error. RESULTS:Twenty NF1 and 13 NF2 patients enrolled; median age was 12 years (interquartile range (IQR) 9-17) and 29 years (IQR 22-38) respectively. By MMT, weak muscle strength ranged from 2-/5 to 4+/5. Biceps strength was 5/5 in all patients. Inter-session ICC for the weak muscles were 0.98 and 0.99 in the NF1 and NF2 cohorts respectively and for biceps were 0.97 and 0.97 respectively. The median CV for average session strength were 5.4% (IQR 2.6%-7.3%) and 2.9% (IQR 2.0%-6.2%) for weak muscles and biceps respectively. CONCLUSION/CONCLUSIONS:HHD performed by a trained examiner with a well-defined protocol is a reliable technique to measure muscle strength in NF1 and NF2. Recommendations for strength testing in NF1 and NF2 trials are provided.
PMID: 34230196
ISSN: 1526-632x
CID: 4932172

Revised diagnostic criteria for neurofibromatosis type 1 and Legius syndrome: an international consensus recommendation

Legius, Eric; Messiaen, Ludwine; Wolkenstein, Pierre; Pancza, Patrice; Avery, Robert A; Berman, Yemima; Blakeley, Jaishri; Babovic-Vuksanovic, Dusica; Cunha, Karin Soares; Ferner, Rosalie; Fisher, Michael J; Friedman, Jan M; Gutmann, David H; Kehrer-Sawatzki, Hildegard; Korf, Bruce R; Mautner, Victor-Felix; Peltonen, Sirkku; Rauen, Katherine A; Riccardi, Vincent; Schorry, Elizabeth; Stemmer-Rachamimov, Anat; Stevenson, David A; Tadini, Gianluca; Ullrich, Nicole J; Viskochil, David; Wimmer, Katharina; Yohay, Kaleb; Huson, Susan M; Evans, D Gareth; Plotkin, Scott R
PURPOSE/OBJECTIVE:By incorporating major developments in genetics, ophthalmology, dermatology, and neuroimaging, to revise the diagnostic criteria for neurofibromatosis type 1 (NF1) and to establish diagnostic criteria for Legius syndrome (LGSS). METHODS:We used a multistep process, beginning with a Delphi method involving global experts and subsequently involving non-NF experts, patients, and foundations/patient advocacy groups. RESULTS:We reached consensus on the minimal clinical and genetic criteria for diagnosing and differentiating NF1 and LGSS, which have phenotypic overlap in young patients with pigmentary findings. Criteria for the mosaic forms of these conditions are also recommended. CONCLUSION/CONCLUSIONS:The revised criteria for NF1 incorporate new clinical features and genetic testing, whereas the criteria for LGSS were created to differentiate the two conditions. It is likely that continued refinement of these new criteria will be necessary as investigators (1) study the diagnostic properties of the revised criteria, (2) reconsider criteria not included in this process, and (3) identify new clinical and other features of these conditions. For this reason, we propose an initiative to update periodically the diagnostic criteria for NF1 and LGSS.
PMID: 34012067
ISSN: 1530-0366
CID: 4894862

Slowing late infantile Batten disease by direct brain parenchymal administration of a rh.10 adeno-associated virus expressing CLN2

Sondhi, Dolan; Kaminsky, Stephen M; Hackett, Neil R; Pagovich, Odelya E; Rosenberg, Jonathan B; De, Bishnu P; Chen, Alvin; Van de Graaf, Benjamin; Mezey, Jason G; Mammen, Grace W; Mancenido, Denesy; Xu, Fang; Kosofsky, Barry; Yohay, Kaleb; Worgall, Stefan; Kaner, Robert J; Souwedaine, Mark; Greenwald, Bruce M; Kaplitt, Michael; Dyke, Jonathan P; Ballon, Douglas J; Heier, Linda A; Kiss, Szilard; Crystal, Ronald G
Late infantile Batten disease (CLN2 disease) is an autosomal recessive, neurodegenerative lysosomal storage disease caused by mutations in the CLN2 gene encoding tripeptidyl peptidase 1 (TPP1). We tested intraparenchymal delivery of AAVrh.10hCLN2, a nonhuman serotype rh.10 adeno-associated virus vector encoding human CLN2, in a nonrandomized trial consisting of two arms assessed over 18 months: AAVrh.10hCLN2-treated cohort of 8 children with mild to moderate disease and an untreated, Weill Cornell natural history cohort consisting of 12 children. The treated cohort was also compared to an untreated European natural history cohort of CLN2 disease. The vector was administered through six burr holes directly to 12 sites in the brain without immunosuppression. In an additional safety assessment under a separate protocol, five children with severe CLN2 disease were treated with AAVrh.10hCLN2. The therapy was associated with a variety of expected adverse events, none causing long-term disability. Induction of systemic anti-AAVrh.10 immunity was mild. After therapy, the treated cohort had a 1.3- to 2.6-fold increase in cerebral spinal fluid TPP1. There was a slower loss of gray matter volume in four of seven children by MRI and a 42.4 and 47.5% reduction in the rate of decline of motor and language function, compared to Weill Cornell natural history cohort (P < 0.04) and European natural history cohort (P < 0.0001), respectively. Intraparenchymal brain administration of AAVrh.10hCLN2 slowed the progression of disease in children with CLN2 disease. However, improvements in vector design and delivery strategies will be necessary to halt disease progression using gene therapy.
PMID: 33268510
ISSN: 1946-6242
CID: 4694282

The Use of MEK Inhibitors in Neurofibromatosis Type 1-Associated Tumors and Management of Toxicities

Klesse, Laura J; Jordan, Justin T; Radtke, Heather B; Rosser, Tena; Schorry, Elizabeth; Ullrich, Nicole; Viskochil, David; Knight, Pamela; Plotkin, Scott R; Yohay, Kaleb
Early-phase clinical trials using oral inhibitors of MEK, the mitogen-activated protein kinase kinase, have demonstrated benefit for patients with neurofibromatosis type 1 (NF1)-associated tumors, particularly progressive low-grade gliomas and plexiform neurofibromas. Given this potential of MEK inhibition as an effective medical therapy, the use of targeted agents in the NF1 population is likely to increase substantially. For clinicians with limited experience prescribing MEK inhibitors, concern about managing these treatments may be a barrier to use. In this manuscript, the Clinical Care Advisory Board of the Children's Tumor Foundation reviews the published experience with MEK inhibitors in NF1 and outlines recommendations for side-effect management, as well as monitoring guidelines. These recommendations can serve as a beginning framework for NF providers seeking to provide the most effective treatments for their patients. IMPLICATIONS FOR PRACTICE: Neurofibromatosis type 1 (NF1) clinical care is on the cusp of a transformative shift. With the success of recent clinical trials using MEK inhibitors, an increasing number of NF1 patients are being treated with MEK inhibitors for both plexiform neurofibromas and low-grade gliomas. The use of MEK inhibitors is likely to increase substantially with the expected upcoming approval of selumetinib for a specific indication for treatment of plexiform neurofibromas in NF1. Given these changes, the Clinical Care Advisory Board of the Children's Tumor Foundation has identified a need within the NF1 clinical community for guidance for the safe and effective use of MEK inhibitors for NF1-related tumors. This article provides a review of the published experience of MEK inhibitors in NF1 and provides recommendations for monitoring and management of side effects.
PMID: 32272491
ISSN: 1549-490x
CID: 4379022

Clinical spectrum of individuals with pathogenic NF1 missense variants affecting p.Met1149, p.Arg1276 and p.Lys1423: genotype-phenotype study in neurofibromatosis type 1

Koczkowska, Magdalena; Callens, Tom; Chen, Yunjia; Gomes, Alicia; Hicks, Alesha D; Sharp, Angela; Johns, Eric; Uhas, Kim Armfield; Armstrong, Linlea; Bosanko, Katherine Armstrong; Babovic-Vuksanovic, Dusica; Baker, Laura; Basel, Donald G; Bengala, Mario; Bennett, James T; Chambers, Chelsea; Clarkson, Lola K; Clementi, Maurizio; Cortés, Fanny M; Cunningham, Mitch; D'Agostino, M Daniela; Delatycki, Martin B; Digilio, Maria C; Dosa, Laura; Esposito, Silvia; Fox, Stephanie; Freckmann, Mary-Louise; Fauth, Christine; Giugliano, Teresa; Giustini, Sandra; Goetsch, Allison; Goldberg, Yael; Greenwood, Robert S; Griffis, Cristin; Gripp, Karen W; Gupta, Punita; Haan, Eric; Hachen, Rachel K; Haygarth, Tamara L; Hernández-Chico, Concepción; Hodge, Katelyn; Hopkin, Robert J; Hudgins, Louanne; Janssens, Sandra; Keller, Kory; Kelly-Mancuso, Geraldine; Kochhar, Aaina; Korf, Bruce R; Lewis, Andrea M; Liebelt, Jan; Lichty, Angie; Listernick, Robert H; Lyons, Michael J; Maystadt, Isabelle; Ojeda, Mayra Martinez; McDougall, Carey; McGregor, Lesley K; Melis, Daniela; Mendelsohn, Nancy; Nowaczyk, Malgorzata J M; Ortenberg, June; Panzer, Karin; Pappas, John G; Pierpont, Mary Ella; Piluso, Giulio; Pinna, Valentina; Pivnick, Eniko K; Pond, Dinel A; Powell, Cynthia M; Rogers, Caleb; Shahar, Noa Ruhrman; Rutledge, S Lane; Saletti, Veronica; Sandaradura, Sarah A; Santoro, Claudia; Schatz, Ulrich A; Schreiber, Allison; Scott, Daryl A; Sellars, Elizabeth A; Sheffer, Ruth; Siqveland, Elizabeth; Slopis, John M; Smith, Rosemarie; Spalice, Alberto; Stockton, David W; Streff, Haley; Theos, Amy; Tomlinson, Gail E; Tran, Grace; Trapane, Pamela L; Trevisson, Eva; Ullrich, Nicole J; Van den Ende, Jenneke; Schrier Vergano, Samantha A; Wallace, Stephanie E; Wangler, Michael F; Weaver, David D; Yohay, Kaleb H; Zackai, Elaine; Zonana, Jonathan; Zurcher, Vickie; Claes, Kathleen B M; Eoli, Marica; Martin, Yolanda; Wimmer, Katharina; De Luca, Alessandro; Legius, Eric; Messiaen, Ludwine M
We report 281 individuals carrying a pathogenic recurrent NF1 missense variants at p.Met1149, p.Arg1276 or p.Lys1423, representing three non-truncating NF1 hotspots in the University of Alabama at Birmingham (UAB) cohort, together identified in 1.8% of unrelated NF1 individuals. About 25% (95% CI, 20.5%-31.2%) of individuals heterozygous for a pathogenic NF1 p.Met1149, p.Arg1276 or p.Lys1423 missense variant had a Noonan-like phenotype, which is significantly more compared to the "classic" NF1-affected cohorts (all P<0.0001). Furthermore, p.Arg1276 and p.Lys1423 pathogenic missense variants were associated with a high prevalence of cardiovascular abnormalities, including pulmonic stenosis (all P<0.0001), while p.Arg1276 variants had a high prevalence of symptomatic spinal neurofibromas (P<0.0001) compared with "classic" NF1-affected cohorts. However, p.Met1149-positive individuals had a mild phenotype, characterized mainly by pigmentary manifestations without externally visible plexiform neurofibromas, symptomatic spinal neurofibromas or symptomatic optic pathway gliomas. As up to 0.4% of unrelated individuals in the UAB cohort carries a p.Met1149 missense variant, this finding will contribute to more accurate stratification of a significant number of NF1 individuals. Although clinically relevant genotype-phenotype correlations are rare in NF1, each affecting only a small percentage of individuals, together they impact counseling and management of a significant number of the NF1 population. This article is protected by copyright. All rights reserved.
PMID: 31595648
ISSN: 1098-1004
CID: 4129722

The MEK inhibitor selumetinib reduces spinal neurofibroma burden in patients with NF1 and plexiform neurofibromas

Jackson, Sadhana; Baker, Eva H; Gross, Andrea M; Whitcomb, Patricia; Baldwin, Andrea; Derdak, Joanne; Tibery, Cecilia; Desanto, Jennifer; Carbonell, Amanda; Yohay, Kaleb; O'Sullivan, Geraldine; Chen, Alice P; Widemann, Brigitte C; Dombi, Eva
Background/UNASSIGNED:Spinal neurofibromas (SNFs) in neurofibromatosis type 1 (NF1) can cause progressive spinal cord compression and neurological dysfunction. The MEK inhibitor selumetinib shrinks the majority of plexiform neurofibromas (PNs) in patients with NF1. We assessed the effect of selumetinib on SNF. Methods/UNASSIGNED:/dose twice daily (max 50 mg b.i.d.; 1 cycle = 28 days). We qualitatively assessed the effect of selumetinib on SNF-related spinal canal distortion, cerebrospinal fluid distribution, and spinal cord deformity on MRI. Results/UNASSIGNED:Twenty-four patients (18 male), median age 16.9 years (range, 6.2-60.3), had SNF, 22 of which were associated with the same nerves as the target PN assessed on the clinical trial. Twenty patients had spinal cord deformity. Twenty-three patients completed at least 12 treatment cycles to date. Eighteen patients showed subtle to a marked improvement in SNF burden, 5 remained stable, and no worsening was observed during treatment. Conclusions/UNASSIGNED:This is the first study describing the effect of selumetinib on SNF. Of 24 patients, 18 exhibited some improvement of SNF burden on imaging. These findings suggest that selumetinib may prevent the worsening of cord compression, potentially reducing the need for surgical interventions in select patients or benefitting patients who do not have a surgical option. Prospective evaluation of the clinical benefit of selumetinib for SNF is warranted.
PMCID:7486535
PMID: 32939452
ISSN: 2632-2498
CID: 4606452

A Thoracentesis with a Neurological Surprise [Meeting Abstract]

Sabadia, Sakinah; Yohay, Kaleb
ISI:000536058005174
ISSN: 0028-3878
CID: 4561542

Response to Hannah-Shmouni and Stratakis [Letter]

Stewart, Douglas R; Korf, Bruce R; Nathanson, Katherine L; Stevenson, David A; Yohay, Kaleb
PMID: 30283095
ISSN: 1530-0366
CID: 3329282

Comparison of hybrid 18F-fluorodeoxyglucose positron emission tomography/magnetic resonance imaging and positron emission tomography/computed tomography for evaluation of peripheral nerve sheath tumors in patients with neurofibromatosis type 1

Raad, Roy A; Lala, Shailee; Allen, Jeffrey C; Babb, James; Mitchell, Carole Wind; Franceschi, Ana M; Yohay, Kaleb; Friedman, Kent P
Rapidly enlarging, painful plexiform neurofibromas (PN) in neurofibromatosis type 1 (NF1) patients are at higher risk for harboring a malignant peripheral nerve sheath tumor (MPNST). Fludeoxyglucose (FDG) positron emission tomography/computed tomography (PET/CT) has been used to support more invasive diagnostic and therapeutic interventions. However, PET/CT imparts an untoward radiation hazard to this population with tumor suppressor gene impairment. The use of FDG PET coupled with magnetic resonance imaging (MRI) rather than CT is a safer alternative but its relative diagnostic sensitivity requires verification. Ten patients (6 females, 4 males, mean age 27 years, range 8-54) with NF1 and progressive PN were accrued from our institutional NF Clinic. Indications for PET scanning included increasing pain and/or progressive disability associated with an enlarging PN on serial MRIs. Following a clinically indicated whole-body FDG PET/CT, a contemporaneous PET/MRI was obtained using residual FDG activity with an average time interval of 3-4 h FDG-avid lesions were assessed for both maximum standardized uptake value (SUVmax) from PET/CT and SUVmax from PET/MR and correlation was made between the two parameters. 26 FDG avid lesions were detected on both PET/CT and PET/MR with an accuracy of 100%. SUVmax values ranged from 1.4-10.8 for PET/CT and from 0.2-5.9 for PET/MRI. SUVmax values from both modalities demonstrated positive correlation (r = 0.45, P < 0.001). PET/MRI radiation dose was significantly lower (53.35% ± 14.37% [P = 0.006]). In conclusion, PET/MRI is a feasible alternative to PET/CT in patients with NF1 when screening for the potential occurrence of MPNST. Reduction in radiation exposure approaches 50% compared to PET/CT.
PMCID:6216733
PMID: 30505221
ISSN: 1450-1147
CID: 3520172

Disease characteristics and progression in patients with late-infantile neuronal ceroid lipofuscinosis type 2 (CLN2) disease: an observational cohort study

Nickel, Miriam; Simonati, Alessandro; Jacoby, David; Lezius, Susanne; Kilian, Dirk; Van de Graaf, Benjamin; Pagovich, Odelya E; Kosofsky, Barry; Yohay, Kaleb; Downs, Matthew; Slasor, Peter; Ajayi, Temitayo; Crystal, Ronald G; Kohlschütter, Alfried; Sondhi, Dolan; Schulz, Angela
BACKGROUND:Late-infantile neuronal ceroid lipofuscinosis type 2 (CLN2) disease, characterised by rapid psychomotor decline and epilepsy, is caused by deficiency of the lysosomal enzyme tripeptidyl peptidase 1. We aimed to analyse the characteristics and rate of progression of CLN2 disease in an international cohort of patients. METHODS:We did an observational cohort study using data from two independent, international datasets of patients with untreated genotypically confirmed CLN2 disease: the DEM-CHILD dataset (n=74) and the Weill Cornell Medical College (WCMC) dataset (n=66). Both datasets included quantitative rating assessments with disease-specific clinical domain scores, and disease course was measured longitudinally in 67 patients in the DEM-CHILD cohort. We analysed these data to determine age of disease onset and diagnosis, as well as disease progression-measured by the rate of decline in motor and language summary scores (on a scale of 0-6 points)-and time from first symptom to death. FINDINGS/RESULTS:In the combined DEM-CHILD and WCMC dataset, median age was 35·0 months (IQR 24·0-38·5) at first clinical symptom, 37·0 months (IQR 35·0 -42·0) at first seizure, and 54·0 months (IQR 47·5-60·0) at diagnosis. Of 74 patients in the DEM-CHILD dataset, the most common first symptoms of disease were seizures (52 [70%]), language difficulty (42 [57%]), motor difficulty (30 [41%]), behavioural abnormality (12 [16%]), and dementia (seven [9%]). Among the 41 patients in the DEM-CHILD dataset for whom longitudinal assessments spanning the entire disease course were available, a rapid annual decline of 1·81 score units (95% CI 1·50-2·12) was seen in motor-language summary scores from normal (score of 6) to no function (score of 0), which occurred over approximately 30 months. Among 53 patients in the DEM-CHILD cohort with available data, the median time between onset of first disease symptom and death was 7·8 years (SE 0·9) years. INTERPRETATION/CONCLUSIONS:In view of its natural history, late-infantile CLN2 disease should be considered in young children with delayed language acquisition and new onset of seizures. CLN2 disease has a largely predictable time course with regard to the loss of language and motor function, and these data might serve as historical controls for the assessment of current and future therapies. FUNDING/BACKGROUND:EU Seventh Framework Program, German Ministry of Education and Research, EU Horizon2020 Program, National Institutes of Health, Nathan's Battle Foundation, Cures Within Reach Foundation, Noah's Hope Foundation, Hope4Bridget Foundation.
PMID: 30119717
ISSN: 2352-4650
CID: 3241532