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Schwann cells from human neurofibromas show increased proliferation rates under the influence of progesterone.

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Neurofibromatosis type 1 (NF1) is a hereditary disease caused by mutations of the NF1 gene at 17q11.2. Loss of the NF1 gene product in Schwann cells leads to the development of benign nerve sheath tumors. These neurofibromas may occur at any time but tend to arise during periods of hormonal

Progesterone receptor expression in neurofibromas.

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Neurofibromas are benign tumors of the peripheral nerve sheath, which occur sporadically and in association with the common familial cancer syndrome, neurofibromatosis type 1. There are intriguing links between the growth of neurofibromas and levels of circulating hormones: neurofibromas often first

Progesterone and Estrogen Receptors in Neurofibromas of Patients with NF1.

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Neurofibromatosis type 1 (NF1) or von Recklinghausen disease is a genetic disorder affecting the growth of cells in nervous system. One of the most remarkable characteristics of this disease is the development of benign tumors of the nervous system (neurofibromas).The purpose of this study was to

Postpartum paraparesis from spinal neurofibroma.

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BACKGROUND One hallmark of neurofibromatosis Type 1 (NF1) is the presence of multiple neurofibromas, which are hormonally responsive and may undergo rapid growth during periods of hormonal surge. Although spinal neurofibromas occur in up to 40% of patients with NF1, they rarely cause neurologic

Puberty and plexiform neurofibroma tumor growth in patients with neurofibromatosis type I.

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OBJECTIVE To assess the relationship between pubertal progression and change in plexiform neurofibroma (PN) burden over time in pediatric and young adult patients with neurofibromatosis type 1 and PNs. METHODS Analyses accounted for sex, age, race, and chemotherapy. Forty-one patients with

The effect of pregnancy on growth-dynamics of neurofibromas in Neurofibromatosis type 1.

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Patients with Neurofibromatosis type 1 (NF1) develop plexiform neurofibromas (PNF) and cutaneous neurofibromas. These tumors are a major cause of the patient's morbidity and mortality. An influence of estrogen and progesterone on tumor growth has been suggested but reports on growth or

Do hormonal contraceptives stimulate growth of neurofibromas? A survey on 59 NF1 patients.

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BACKGROUND Neurofibromas are benign tumors of the peripheral nerves and hallmark of neurofibromatosis type 1 (NF1), a tumor suppressor gene syndrome. Neurofibromas mostly start developing at puberty and can increase in size and number during pregnancy. Expression of progesterone receptors has been

Analysis of steroid hormone effects on xenografted human NF1 tumor schwann cells.

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The neurofibroma, a common feature of neurofibromatosis type 1 (NF1), is a benign peripheral nerve sheath tumor that contains predominantly Schwann cells (SC). There are reports that neurofibroma growth may be affected by hormonal changes, particularly in puberty and pregnancy, suggesting an

[Multiple intracranial and intraspinal meningiomas in the neurocristopathy (phacomatosis) type of neurofibromatosis].

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Presentation of a case of a "central type" neurofibromatosis in a 56-year old woman, clinically diagnosed erroneously as multiple sclerosis with a 20 years long course. Disturbances of hearing, walking, sight, sensitivity, incontinentia, intracranial hypertension and headache represented the main

Aggressive Angiomyxoma-Report of a Rare Male Buttock Lesion.

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Aggressive angiomyxoma is a very rare benign tumor for male population with fewer than 50 cases reported since the description of this tumor. Most documented cases of aggressive angiomyxomas were found in genital, perineal, and pelvic regions in women of child bearing age. We report a case of a

In vitro studies of steroid hormones in neurofibromatosis 1 tumors and Schwann cells.

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The most common NF1 feature is the benign neurofibroma, which consists predominantly of Schwann cells. Dermal neurofibromas usually arise during puberty and increase in number throughout adulthood. Plexiform neurofibromas, associated with larger nerves, are often congenital and can be life

Hormones and tumours in central nervous system (CNS): steroid receptors in primary spinal cord tumours.

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On the basis of the studies reported on steroid receptors in brain tumours, cytoplasmic and nuclear estrogen (ER) and progesterone (PR) receptors have been examined in forty primary spinal cord tumours: fifteen neurinomas, three neurofibromas, nine meningiomas, nine ependymomas, two astrocytomas,

Targeted NF1 cancer therapeutics with multiple modes of action: small molecule hormone-like agents resembling the natural anticancer metabolite, 2-methoxyoestradiol.

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BACKGROUND Both the number and size of tumours in NF1 patients increase in response to the rise in steroid hormones seen at puberty and during pregnancy. The size of tumours decreases after delivery, suggesting that hormone-targeting therapy might provide a viable new NF1 treatment approach. Our

Immunohistochemical Approach to the Differential Diagnosis of Meningiomas and Their Mimics.

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The differential diagnosis between meningioma and others tumors can be challenging. This study aimed to evaluate different immunohistochemical markers for the differential diagnosis between meningioma and their morphological mimics. Immunohistochemistry was performed on tissue microarray with

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