Association of Staphylococcus aureus Colonization With Severity of Acute Radiation Dermatitis in Patients With Breast or Head and Neck Cancer.

Importance: Pathogenesis of acute radiation dermatitis (ARD) is not completely understood. Pro-inflammatory cutaneous bacteria may contribute to cutaneous inflammation after radiation therapy. Objective: To evaluate whether nasal colonization with Staphylococcus aureus (SA) before radiation therapy is associated with ARD severity in patients with breast or head and neck cancer. Design, Setting, and Participants: This prospective cohort study with observers blinded to colonization status was conducted from July 2017 to May 2018 at an urban academic cancer center. Patients aged 18 years or older with breast or head and neck cancer and plans for fractionated radiation therapy (≥15 fractions) with curative intent were enrolled via convenience sampling. Data were analyzed from September to October 2018. Exposures: Staphylococcus aureus colonization status before radiation therapy (baseline). Main Outcomes and Measures: The primary outcome was ARD grade using the Common Terminology Criteria for Adverse Event Reporting, version 4.03. Results: Among 76 patients analyzed, mean (SD) age was 58.5 (12.6) years and 56 (73.7%) were female. All 76 patients developed ARD: 47 (61.8%) with grade 1, 22 (28.9%) with grade 2, and 7 (9.2%) with grade 3. The prevalence of baseline nasal SA colonization was higher among patients who developed grade 2 or higher ARD compared with those who developed grade 1 ARD (10 of 29 [34.5%] vs 6 of 47 [12.8%]; P = .02, by χ2 test). Conclusions and Relevance: In this cohort study, baseline nasal SA colonization was associated with development of grade 2 or higher ARD in patients with breast or head and neck cancer. The findings suggest that SA colonization may play a role in the pathogenesis of ARD.

A Multi-Centered Case-Control Study of Vitiligo Support Groups and Quality of Life.

BACKGROUND: There is limited research on the association between vitiligo support group membership and patient quality of life (QoL). OBJECTIVES: To explore the association between support groups and QoL in those with vitiligo by evaluating and comparing the QoL of vitiligo support group members and non-support group members. METHODS: Support group members (n=135) and non-support group members (n=129) were recruited from the Global Vitiligo Foundation (GVF), and three academic medical centers respectively. Patients completed the Vitiligo-Specific Quality of Life (VitiQoL) instrument and a demographic survey. RESULTS: Mean VitiQoL scores for support group members were higher than non-support group members (48.6 ± 23.6 vs 33.0 ± 23.8; P-value < 0.0001), highlighting more negatively impacted QoL. Support group members were less likely to be undergoing treatment (27.4% vs 53.5%; P-value = <0.0001) and were more likely to report duration of vitiligo for >20 years (38.5% vs 19.4%; P-value = 0.0007). CONCLUSIONS: Vitiligo support group membership is associated with worse QoL. Individuals with vitiligo who have worse QoL, chronic, and/or untreated vitiligo may be more likely to seek out vitiligo support groups. Support group referral should be considered in the therapeutic management of vitiligo, particularly in patients whose QoL is more significantly impacted, who fail or are who are without access to treatment or have longstanding disease. J Drugs Dermatol. 2021;20(6):672-675. doi:10.36849/JDD.5706.

Evaluation of Hair Density in Different Ethnicities in a Healthy American Population Using Quantitative Trichoscopic Analysis.

BACKGROUND: There is limited research into normative hair density values in individuals of Hispanic descent. METHODS: In order to help establish baseline density values in these individuals, we evaluated the hair density in 99 Americans of Hispanic descent and compared them with the values in 44 individuals of African descent and 23 Caucasians. Participants were recruited from a New York City medical center and self-identified their ethnicity. Biracial individuals were excluded from the study. RESULTS: The hair density means ± SD ranged from 169 ± 31 to 178 ± 33/cm2 in Americans of Hispanic descent, from 148 ± 25 to 160 ± 27/cm2 in individuals of African descent, and from 214 ± 28 to 230 ± 33/cm2 in Caucasian individuals. All differences in hair densities between the ethnicities were statistically significant (p values ranging from 3.03 × 10-14 to 0.0249). CONCLUSION: While trichoscopy is not as accurate as invasive histological assessment of hair density or phototrichogram, it is still a reliable and fast method for assessing hair density. Increased awareness of ethnic variances in hair density can help clinicians and researchers diagnose hair disorders, monitor response to therapy, and conduct hair-related research in these patients.

Development of Halo Nevi in a Lung Cancer Patient: A Novel Immune-Related Cutaneous Event from Atezolizumab.

Immunotherapy-induced vitiligo is an immune-related adverse event (irAE) observed in metastatic melanoma patients treated with immune checkpoint inhibitors that target the cytotoxic T-lymphocyte-associated protein 4 (CTLA-4) and programmed cell death-1 (PD-1) pathways. To date, the development of leukoderma, poliosis, and halo nevi during immunotherapy has largely been reported in metastatic melanoma patients. We report a case of immunotherapy-induced leukoderma presenting as halo nevi in a patient with non-small cell lung cancer (NSCLC) treated with atezolizumab, a programmed cell death ligand (PD-L1) antibody. Immunotherapy-induced vitiligo in metastatic melanoma patients may be associated with improved survival, but it remains to be determined whether its occurrence in non-melanoma cancers has the same prognostic significance.

J Drugs Dermatol. 2017;16(10):1047-1049.