1 citations
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July 2025 in “SKIN The Journal of Cutaneous Medicine” In this study, ritlecitinib 50-mg showed clinically meaningful efficacy, with improvements in the Severity of Alopecia Tool score observed in patients with alopecia areata over a 3-year period, demonstrating long-term benefit in both clinician- and patient-reported outcomes.
March 2026 in “American Journal of Clinical Dermatology” In this study, ritlecitinib 50 mg produced clinically meaningful improvements in scalp hair regrowth over three years for patients aged 12 and older with severe alopecia areata, with 65.1% showing substantial hair regrowth and 31.2% achieving complete regrowth, while also maintaining a consistent safety profile.
11 citations
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January 2018 in “DOAJ (DOAJ: Directory of Open Access Journals)” This case report observed that while a 4-year-old boy with vitamin D-dependent rickets type II showed biochemical and bone improvement after vitamin D and calcium treatment, his alopecia did not improve.
This study concluded that the combination of all-trans-retinoic acid and tocopherol-α is not recommended for treating del(5q) myelodysplastic syndromes due to low efficacy and high incidence of adverse effects.
1 citations
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November 2025 in “American Journal of Clinical Dermatology” This study reports that long-term treatment with ritlecitinib is generally well tolerated for up to approximately five years in patients aged 12 and older with alopecia areata, with the safety profile aligning with previous data from the ALLEGRO clinical trials.
13 citations
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February 2025 in “Journal of the European Academy of Dermatology and Venereology” Ritlecitinib shows promise for treating alopecia areata, especially with early and extended treatment.
21 citations
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January 2006 in “Hormone Research in Paediatrics” In this case study, a girl with hereditary vitamin D resistant rickets had a novel mutation in the VDR gene that affected hair cycling without causing total alopecia, suggesting ligand-independent VDR function in hair cycling.
73 citations
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April 1999 in “Journal of steroid biochemistry and molecular biology/The Journal of steroid biochemistry and molecular biology” This study found that the vitamin D-VDR system is crucial for mineral and bone metabolism post-weaning and identified missense mutations in 1alpha-hydroxylase causing type I rickets.
3 citations
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November 2023 in “Journal of Investigative Dermatology” Over 45% of patients with alopecia areata benefit from ritlecitinib, mostly within a year.
1 citations
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October 2025 in “International Journal of Dermatology” In this study, participants receiving a 50-mg maintenance dose of ritlecitinib reported greater improvements in emotional and activity limitations due to hair loss by Week 48 compared to those on a 10-mg dose.
6 citations
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March 2024 in “SKIN The Journal of Cutaneous Medicine” In this ongoing phase 3 study, ritlecitinib demonstrated sustained efficacy up to 24 months in patients aged 12 or older with alopecia areata, showing increased response rates with or without an initial loading dose and supporting its long-term use.
November 2023 in “Biomolecules” In this study involving genetically modified rats, researchers observed that specific mutations in the vitamin D receptor affect calcium levels and bone formation, emphasizing the receptor's role in maintaining healthy bone density and its importance in regulating hair cycle and skin health.
May 2026 in “Dermatology and Therapy” This study reports that among adults with severe alopecia areata taking ritlecitinib, 49% saw hair regrowth within 3 months, increasing to 82% after more than 6 months; treatment satisfaction also rose with longer duration, indicating sustained efficacy and improved quality of life over time.
2 citations
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June 2024 in “Frontiers in Plant Science” This study found that RALF peptides, through liquid-liquid phase separation, form condensates with pectin and other proteins, playing a pivotal role in plant development and stress response regulation.
44 citations
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May 1998 in “PubMed” In this study, a specific retinoic acid receptor antagonist caused severe craniofacial anomalies in mouse fetuses when administered early in pregnancy, but not limb anomalies, highlighting developmental stage-specific roles of retinoic acid.
4 citations
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July 2024 in “Pharmacology Research & Perspectives” In this phase 2a study of adults with alopecia areata, researchers observed that ritlecitinib treatment did not result in significant differences in brainstem auditory evoked potential changes or axonal swelling compared to placebo, suggesting the dog toxicity findings may not be clinically relevant in humans.
2 citations
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June 2024 in “Dermatology” This study found that patients receiving active ritlecitinib doses reported greater satisfaction with hair growth compared to placebo, with high agreement observed between clinician evaluations of scalp hair improvement and patient satisfaction through week 48.
November 2025 in “SKIN The Journal of Cutaneous Medicine” This study evaluated the long-term safety of ritlecitinib in adolescents with alopecia areata and found it to be well-tolerated without new safety concerns over approximately five years, with common adverse events including positive SARS-CoV-2 tests, acne, headache, and nasopharyngitis.
10 citations
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September 2015 in “PLoS ONE” This case report documents a female toddler with novel compound heterozygous mutations in the VDR gene causing hereditary 1,25-dihydroxyvitamin D-resistant rickets, expanding the known mutation spectrum for this disease.
December 2024 in “CONICET Digital (CONICET)” This study found that the small signaling peptide RALF22 plays a key role in root hair growth response to volatile compounds emitted by Penicillium aurantiogriseum through ethylene, auxin, and photosynthesis signaling in Arabidopsis.
28 citations
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March 2010 in “British Journal of Dermatology” This abstract contains only supplementary material information and reports no new research findings.
May 2025 in “CPT Pharmacometrics & Systems Pharmacology” This study examined the safety profile of ritlecitinib, a drug for alopecia areata, and found that it does not cause significant QTc prolongation or severe lymphopenia, with no unique safety risks expected in adolescents.
5 citations
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July 2017 in “International journal of endocrinology and metabolism/International journal of endocrinology and metabolism.” This study described the clinical and genetic features of two Iranian siblings with hereditary vitamin D resistant rickets, identifying a specific VDR gene mutation contributing to their symptoms.
37 citations
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October 2006 in “Archives of Biochemistry and Biophysics” This study describes a patient with hereditary vitamin D resistant rickets (HVDRR) who, despite having a truncated vitamin D receptor, did not exhibit typical hair or skin abnormalities, suggesting possible compensation via interactions with other proteins.
26 citations
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September 1999 in “Canadian Journal of Botany” This study found that a recessive mutation in the RHD4 gene of Arabidopsis thaliana leads to slower and more variable tip growth in seedling root hairs, resulting in shorter and wider hairs than in wild-type plants.
4 citations
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October 2024 in “American Journal of Clinical Dermatology” This study found that ritlecitinib improved patient-reported outcomes related to hair growth in individuals with alopecia areata, with some experiencing clinically meaningful hair regrowth, although changes in emotional symptoms and activity limitations were minimal and similar across treatment groups.
151 citations
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June 2010 in “Endocrinology and metabolism clinics of North America” This article compares two rare genetic diseases, vitamin D-dependent rickets type 1 and type 2, focusing on their similar presentations of hypocalcemia and rickets in infancy, but reports no new clinical results.
July 2026 in “Journal of the American Academy of Dermatology”
January 2025 in “Clinical Pediatric Endocrinology” In a case study of vitamin D-dependent rickets type 2A, researchers observed that while active vitamin D treatment failed to improve bone and laboratory abnormalities, oral calcium lactate significantly ameliorated these issues, although skin and hair problems remained unresponsive.
1 citations
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November 2023 in “SKIN The Journal of Cutaneous Medicine”