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NF1 Truncating Mutations Associated to Aggressive Clinical Phenotype with Elephantiasis Neuromatosa and Solid Malignancies

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NF1 Truncating Mutations Associated to Aggressive Clinical Phenotype with Elephantiasis Neuromatosa and Solid Malignancies ANTICANCER RESEARCH 34: 3021-3030 (2014) NF1 Truncating Mutations Associated to Aggressive Clinical Phenotype with Elephantiasis Neuromatosa and Solid Malignancies GIOVANNI PONTI1, DAVIDE MARTORANA2, GIOVANNI PELLACANI3, CRISTEL RUINI3, PIETRO LOSCHI4, ALESSIO BACCARANI4, GIORGIO DE SANTIS4, ANNAMARIA POLLIO5, TAURO MARIA NERI2, VICTOR DESMOND MANDEL3, ANTONIO MAIORANA6, LIVIA MACCIO6, MONIA MACCAFERRI3 and ALDO TOMASI1 1Department of Diagnostic and Clinical Medicine and Public Health, University of Modena and Reggio Emilia, Modena, Italy; 2Department of Genetics, University of Parma, Parma, Italy; 3Department of Dermatology, University of Modena and Reggio Emilia, Modena, Italy; 4Department of Plastic Surgery, University of Modena and Reggio Emilia, Modena, Italy; 5Department of Neurosciences, University of Padua, Padova, Italy; 6Department of Pathology, University of Modena and Reggio Emilia, Modena, Italy Abstract. Background/Aim: Von Recklinghausen disease is stromal tumors. Conclusion: This effect on protein synthesis, a syndrome characterized by a wide phenotypic variability rather than the type of NF1 mutation, is the key to the giving rise to both, cutaneous and visceral benign and explanation of the genotype-phenotype correlations in the malignant neoplasms. The first include cutaneous context of neurofibromatosis type 1. neurofibromas, subcutaneous and plexiform neurofibromas. The latter can undergo malignant transformation and/or Cutaneous or subcutaneous neurofibromas, plexiform determine elephantiasis neuromatosa. Visceral tumors may neurofibromas, axillary or inguinal freckling, optic gliomas, include malignant peripheral nerve sheet tumors, iris Lisch nodules and multiple café au-lait spots are the gastrointestinal stromal tumors, cerebral gliomas and main clinical features of NF1 (Neurofibromatosis type 1), abdominal neurofibromas. In the present study, the authors also called von Recklinghausen disease or peripheral discuss the clinical and biomolecular characterization of a neurofibromatosis, which is one of the most common cohort of 20 families with a diagnosis of type 1 autosomal dominant disorders, with nearly 100% penetrance neurofibromatosis. Patients and Methods: Clinically, the by adulthood (1). Skin lesions, termed cutaneous cohort includes three probands with elephantiasis neurofibromas, derived from skin sensory nerves or single neuromatosa and a peculiarly high incidence of breast and nerve ending such as dermal tumors associated with large gastrointestinal cancer. Results: Among the 14 NF1 nerves, may spread within the dermis and appear as a diffuse mutations documented, 10 encoding for a truncated protein mass. Another type of lesion, plexiform neurofibromas have been associated to particularly aggressive clinical (PNFs), usually involves major nerve trunks or nerve plexi; phenotypes including elephantiasis neuromatosa, malignant sometimes visible on the surface of the body, but it may be peripheral nerve sheet tumors, breast cancer, gastrointestinal also internal. Lesions visible on the skin surface, may arise from superficial peripheral nerves or represent the superficial extension of a deeper massive plexiform mass (2). While cutaneous neurofibromas are detected in almost all NF1 adult Correspondence to: Dr. Giovanni Ponti, Department of Diagnostic patients, PNFs are present in 30-50% (1, 3) of NF1 patients; and Clinical Medicine and Public Health; Via del Pozzo 71; 41124 a fraction of PNF (10-15%) may transform into malignant Modena, Italy. Tel: +39 594224748, Fax +39 594224271, e-mail: peripheral nerve sheet tumors (MPNSTs) (4, 5) and can, [email protected] though rarely, determine clinical aspects of hypertrophy or a Key Words: Neurofibromatosis type 1, plexiform neurofibroma; NF1 clear-cut elephantiasis neuromatosa (EN) (6). It is known truncating mutations, Elephantiasis neuromatosa; GIST; malignant that in the context of NF1 we can find a wide phenotypic peripheral nerve sheet tumors. variability, both in the same family and among different 0250-7005/2014 $2.00+.40 3021 ANTICANCER RESEARCH 34: 3021-3030 (2014) families. It is, therefore, possible to find patients with few Germline mutation analysis of NF1 gene. Genomic DNA was skin lesions and mild clinical phenotype, along with patients extracted from the peripheral blood of patients with NF1 using the presenting an aggressive clinical phenotype, including QIAamp DNA Blood Mini Kit (Qiagen Inc., Valencia, CA, USA), and stored at –20˚C until use. All of the NF1 exons were amplified gastrointestinal stromal tumors (GISTs), brain tumors (low- by PCR with intron spanning primers as described by (13, 14) and and high-grade gliomas), neuroendocrine tumors analyzed with denaturing high-performance liquid chromatography (somatostatinomas, pheocromocytomas), haematologic (DHPLC), as described elsewhere (15). For each abnormal elution tumors (leukemias), breast cancer (7-9) underlying the profile, genomic DNA was directly sequenced in both directions malignant progression of neurofibromas (5). PNF, when using a CEQ Dye-Terminator Cycle Sequencing Kit (Beckman plexiform and deep, can define cases of hypertrophy and/or Coulter Inc., Miami, FL, USA) according to the manufacturer’s EN involving the trigeminal nerve, the trunk, and upper and protocol. Mutations were checked using the Mutalyzer program (https://mutalyzer.nl/). lower extremities (10, 2). In particular, EN is a rare clinical manifestation enclosed in the NF1 phenotype and derives Results from plexiform neurofibromas of deep nerves associated to hyper-proliferation of the bone and the perineural connective Clinical characterization. Twenty patients were clinically tissue infiltrating adjacent fat and muscles, containing a diagnosed with NF1; 14 of them carried an NF1 germline mixture of Schwann cells, fibroblasts, reticulin, collagen mutation (8 females and 6 males; mean age=52, 07; fibers, and a loose mucoid matrix (6). Furthermore range=29-73 years). The tumor spectrum in the NF1 lymphedema, in EN, based on a congenital lymphatic probands included colonic and duodenal adenomatous disorder, determines secondary adipocyte hyperplasia polyps, two colonic adenocarcinomas, two GISTs, three possibly based on cellular trans-differentiation. In fact, the breast tumors and cerebral glioblastomas. Among affected lymphostasis due to both primary and secondary first-degree relatives, adenomatous polyps, cerebral lymphedema determine the fat cell transformation resulting glioblastoma, colon cancers, breast cancers, pancreatic in hypertrophic adipose tissue and fibrosis (11). cancer and kidney cancers were detected. In particular, Despite the wide genotypic and phenotypic variability in duodenum cancers (GIST and adenomatous polyps) were the context of NF1, just a few genotype-phenotype diagnosed in four probands, kidney tumors in five first- correlations have been reported. It is known that deletions in degree relatives, breast cancer in four first degree relatives NF1 are associated to more aggressive clinical phenotypes and pancreatic cancer in two first degree relatives (Table I). with an earlier onset. NF1 deletions have been found in Three probands showed EN and a peculiarly high incidence association to congenital plexiform neurofibromas and/or of breast and gastrointestinal cancer. appearing in early childhood (<1 year), characterized by Our first patient was a Caucasian female with a case of cranio-facial dysmorphisms, and by a particularly complex giant elephantiasis of the arm and numerous cutaneous neoplastic spectrum, including solid tumors in various neurofibromas, some of them pedunculated and of major locations exhibiting a higher risk of malignant transformation dimension. The family history highlighted familial for neurofibromas (12). There have been no studies segregation with generational anticipation of NF1 phenotype investigating on the role of NF1 truncating mutations in NF1 (Figures 1 and 2). The proband underwent surgical syndrome cases with EN and/or solid neoplasms. In this enucleation of an arm tumor. Pathology revealed at gross study, we have described the clinical and biomolecular examination a skin flap of 30×10 cm with 4 nodular lesions, characterization of a family cohort with NF1, with particular respectively of 5, 9, 10 and 11 cm of diameter. The minor attention to the phenotype of EN and other solid neoplasms. lesion was a dermal pedunculated nodule protruding from the A secondary aim was the analysis of genotype-phenotype skin, while the other three lesions were deeper and correlations in the assessment of a prognostic role for NF1 subcutaneous. Microscopically all the nodules were truncating mutations in the pathogenesis of particularly composed by small spindle cells with indistinct cell borders, aggressive NF1 phenotypes. scanty pale cytoplasm and elongated nuclei with a serpentine configuration and pointed ends set in a collagenous stroma. Patients and Methods Inflammatory cells, particular mast cells, and small nerve fibres were also present (Figure 3). Positive staining for S- Patients. Between 1999 and 2013, twenty families clinically- 100 protein and CD-34 positivity were also observed. The diagnosed with NF1 have been identified in the district of Modena. diagnosis was of multiple neurofibromas. Genetic analysis Reconstruction of family pedigrees of at least three consecutive detected the germline mutation g.116321C>T; c.1318C>T. generations, collection of photographic documentation of cutaneous clinical features of different first, second
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