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Review

Thyroid Malignancy and Cutaneous Lichen Amyloidosis: Key Points Amid RET Pathogenic Variants in Medullary Thyroid Cancer/Multiple Endocrine Neoplasia Type 2 (MEN2)

by
Laura-Semonia Stanescu
1,2,†,
Adina Ghemigian
2,3,†,
Mihai-Lucian Ciobica
4,5,*,
Claudiu Nistor
6,7,*,
Adrian Ciuche
6,7,
Andreea-Maria Radu
8,9,
Florica Sandru
8,9 and
Mara Carsote
2,3
1
PhD Doctoral School, “Carol Davila” University of Medicine and Pharmacy, 0505474 Bucharest, Romania
2
Department of Clinical Endocrinology V, C.I. Parhon National Institute of Endocrinology, 011863 Bucharest, Romania
3
Department of Endocrinology, “Carol Davila” University of Medicine and Pharmacy, 020021 Bucharest, Romania
4
Department of Internal Medicine and Gastroenterology, “Carol Davila” University of Medicine and Pharmacy, 020021 Bucharest, Romania
5
Department of Internal Medicine I and Rheumatology, “Dr. Carol Davila” Central Military University Emergency Hospital, 010825 Bucharest, Romania
6
Department 4—Cardio-Thoracic Pathology, Thoracic Surgery II Discipline, “Carol Davila” University of Medicine and Pharmacy, 0505474 Bucharest, Romania
7
Thoracic Surgery Department, “Dr. Carol Davila” Central Emergency University Military Hospital, 010825 Bucharest, Romania
8
Department of Dermatovenerology, Elias University Emergency Hospital, 011461 Bucharest, Romania
9
Department of Dermatovenerology, “Carol Davila” University of Medicine and Pharmacy, 020021 Bucharest, Romania
*
Authors to whom correspondence should be addressed.
These authors contributed equally to this work.
Int. J. Mol. Sci. 2024, 25(18), 9765; https://doi.org/10.3390/ijms25189765
Submission received: 5 August 2024 / Revised: 28 August 2024 / Accepted: 5 September 2024 / Published: 10 September 2024
(This article belongs to the Special Issue New Advances in Thyroid Cancer)

Abstract

We aimed to provide an updated narrative review with respect to the RET pathogenic variants and their implications at the clinical and molecular level in the diagnosis of medullary thyroid cancer (MTC)/multiple endocrine neoplasia (MEN) type 2, particularly with respect to the presence of cutaneous lichen amyloidosis (CLA). We searched English-language, in extenso original articles with no timeline nor study design restriction that were published on PubMed. A traditional interplay stands for CLA and MTC in MEN2 (not MEN3) confirmation. While the connection has been reported for more than three decades, there is still a large gap in understanding and addressing it. The majority of patients with MEN2A-CLA have RET pathogenic variants at codon 634; hence, it suggests an involvement of this specific cysteine residue in both disorders (most data agree that one-third of C634-positive subjects have CLA, but the ranges are between 9% and 50%). Females seem more prone to MEN2-CLA than males. Non-C634 germline RET pathogenic variants included (at a low level of statistical evidence) the following: RET V804M mutation in exon 14 for MTC-CLA (CLA at upper back); RET S891A mutation in exon 15 binding OSMR variant G513D (familial MTC and CLA comprising the lower legs to thighs, upper back, shoulders, arms, and forearms); and C611Y (CLA at interscapular region), respectively. Typically, CLA is detected at an early age (from childhood until young adulthood) before the actual MTC identification unless RET screening protocols are already applied. The time frame between CLA diagnosis and the identification of RET pathogenic variants was between 5 and 60 years according to one study. The same RET mutation in one family is not necessarily associated with the same CLA presentation. In MTC/MEN2 subjects, the most affected CLA area was the scapular region of the upper back. Alternatively, another hypothesis highlighted the fact that CLA is secondary to long-term prurit/notalgia paresthetica (NP) in MTC/MEN2. OSMR p. G513D may play a role in modifying the evolutionary processes of CLA in subjects co-harboring RET mutations (further studies are necessary to sustain this aspect). Awareness in CLA-positive patients is essential, including the decision of RET testing in selected cases.
Keywords: thyroid; RET; amyloidosis; neuroendocrine; multiple endocrine neoplasia; skin; thyroid malignancy; lichen; codon; gene thyroid; RET; amyloidosis; neuroendocrine; multiple endocrine neoplasia; skin; thyroid malignancy; lichen; codon; gene

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MDPI and ACS Style

Stanescu, L.-S.; Ghemigian, A.; Ciobica, M.-L.; Nistor, C.; Ciuche, A.; Radu, A.-M.; Sandru, F.; Carsote, M. Thyroid Malignancy and Cutaneous Lichen Amyloidosis: Key Points Amid RET Pathogenic Variants in Medullary Thyroid Cancer/Multiple Endocrine Neoplasia Type 2 (MEN2). Int. J. Mol. Sci. 2024, 25, 9765. https://doi.org/10.3390/ijms25189765

AMA Style

Stanescu L-S, Ghemigian A, Ciobica M-L, Nistor C, Ciuche A, Radu A-M, Sandru F, Carsote M. Thyroid Malignancy and Cutaneous Lichen Amyloidosis: Key Points Amid RET Pathogenic Variants in Medullary Thyroid Cancer/Multiple Endocrine Neoplasia Type 2 (MEN2). International Journal of Molecular Sciences. 2024; 25(18):9765. https://doi.org/10.3390/ijms25189765

Chicago/Turabian Style

Stanescu, Laura-Semonia, Adina Ghemigian, Mihai-Lucian Ciobica, Claudiu Nistor, Adrian Ciuche, Andreea-Maria Radu, Florica Sandru, and Mara Carsote. 2024. "Thyroid Malignancy and Cutaneous Lichen Amyloidosis: Key Points Amid RET Pathogenic Variants in Medullary Thyroid Cancer/Multiple Endocrine Neoplasia Type 2 (MEN2)" International Journal of Molecular Sciences 25, no. 18: 9765. https://doi.org/10.3390/ijms25189765

APA Style

Stanescu, L.-S., Ghemigian, A., Ciobica, M.-L., Nistor, C., Ciuche, A., Radu, A.-M., Sandru, F., & Carsote, M. (2024). Thyroid Malignancy and Cutaneous Lichen Amyloidosis: Key Points Amid RET Pathogenic Variants in Medullary Thyroid Cancer/Multiple Endocrine Neoplasia Type 2 (MEN2). International Journal of Molecular Sciences, 25(18), 9765. https://doi.org/10.3390/ijms25189765

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