High-dose vitamin D versus placebo to prevent complications in COVID-19 patients: Multicentre randomized controlled clinical trial.

BACKGROUND: The role of oral vitamin D3 supplementation for hospitalized patients with COVID-19 remains to be determined. The study was aimed to evaluate whether vitamin D3 supplementation could prevent respiratory worsening among hospitalized patients with COVID-19. METHODS AND FINDINGS: We designed a multicentre, randomized, double-blind, sequential, placebo-controlled clinical trial. The study was conducted in 17 second and third level hospitals, located in four provinces of Argentina, from 14 August 2020 to 22 June 2021. We enrolled 218 adult patients, hospitalized in general wards with SARS-CoV-2 confirmed infection, mild-to-moderate COVID-19 and risk factors for disease progression. Participants were randomized to a single oral dose of 500 000 IU of vitamin D3 or matching placebo. Randomization ratio was 1:1, with permuted blocks and stratified for study site, diabetes and age (≤60 vs >60 years). The primary outcome was the change in the respiratory Sepsis related Organ Failure Assessment score between baseline and the highest value recorded up to day 7. Secondary outcomes included the length of hospital stay; intensive care unit admission; and in-hospital mortality. Overall, 115 participants were assigned to vitamin D3 and 105 to placebo (mean [SD] age, 59.1 [10.7] years; 103 [47.2%] women). There were no significant differences in the primary outcome between groups (median [IQR] 0.0 [0.0-1.0] vs 0.0 [0.0-1.0], for vitamin D3 and placebo, respectively; p = 0.925). Median [IQR] length of hospital stay was not significantly different between vitamin D3 group (6.0 [4.0-9.0] days) and placebo group (6.0 [4.0-10.0] days; p = 0.632). There were no significant differences for intensive care unit admissions (7.8% vs 10.7%; RR 0.73; 95% CI 0.32 to 1.70; p = 0.622), or in-hospital mortality (4.3% vs 1.9%; RR 2.24; 95% CI 0.44 to 11.29; p = 0.451). There were no significant differences in serious adverse events (vitamin D3 = 14.8%, placebo = 11.7%). CONCLUSIONS: Among hospitalized patients with mild-to-moderate COVID-19 and risk factors, a single high oral dose of vitamin D3 as compared with placebo, did not prevent the respiratory worsening. TRIAL REGISTRATION: ClincicalTrials.gov Identifier: NCT04411446.

Proliferación linfoide atípica intravascular de linfocitos T-CD30+ sobre granuloma piogénico (hemangioma capilar lobular) / Intravascular atypical T-cell proliferation T-CD30+ in a pyogenic granuloma (lobular capillary hemangioma)

En este trabajo presentamos el caso de una proliferación linfoide atípica constituida por una población de linfocitos T-CD30+, que ocupa los vasos de un granuloma piogénico (hemangioma capilar lobular). Esta población linfoide T (CD4) presenta atipia y alto índice proliferativo, por lo que resulta necesario descartar un linfoma intravascular. Se ha descrito recientemente una proliferación de estas características que puede ser malinterpretada como un linfoma intravascular debido a la atipia y al alto índice mitótico. Los pacientes tienen buen pronóstico y no presentan signos de linfoma. El reordenamiento T resultó nulo, y la paciente continúa asintomática hasta el presente. Nuestro objetivo es presentar esta nueva entidad de carácter reactivo que simula un linfoma, y resaltar la importancia de su reconocimiento en el diagnóstico diferencial de un linfoma intravascular cutáneo (AU)

We report a case of atypical intravascular CD30+ T-cell proliferation in a patient with pyogenic granuloma (Lobular Capillary Hemangioma). The T (CD4) cell population showed cell atypia and a high proliferation index, thus it was necessary to discard an intravascular lymphoma. Cutaneous intravascular lymphoma commonly represents a diffuse large B-cell lymphoma with predominantly intravascular growth, although it could be also represented by intravascular T cell lymphomas. Recently a CD30+ T-cell proliferation was described that could mimic an intravascular T cell lymphoma. In our case TCR rearrangement was null and the patient remained healthy. We report a new case of this benign reactive process and discuss the importance of its differential diagnosis (AU)

Bcl-2 and CD10 expression in the differential diagnosis of trichoblastoma, basal cell carcinoma, and basal cell carcinoma with follicular differentiation.

BACKGROUND: Both trichoblastoma and basal cell carcinoma (BCC) of the skin are characterized morphologically by the proliferation of basaloid cells; however, BCCs are clinically associated with a more aggressive behavior. An accurate diagnosis of these lesions is essential for effective, timely treatment and appropriate therapeutic decisions. METHODS: This study includes 40 lesions. Bcl-2 and CD10 immunohistochemistry were performed in all cases and the patterns of expression were analyzed. RESULTS: Bcl-2 is useful for the detection of BCC with diffuse expression in nests of basaloid cells, but cannot distinguish between BCC with follicular differentiation and trichoblastoma, as both lesions show the same pattern with positive and negative areas. Conversely, CD10 expression can distinguish between trichoblastomas with peritumoral stromal staining and BCCs with epithelial staining. If both stromal and epithelial areas are stained, these cases are classified as BCC with follicular differentiation. CONCLUSIONS: CD10 is useful for distinguishing between BCC with widespread follicular differentiation and trichoblastomas.