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There is limited ability to predict the severity of allergic reactions in children. Data derived predominantly from adults have implicated the platelet-activating factor pathway as a potential contributor to severe anaphylaxis. In this study, we sought to prospectively assess involvement of key components of the platelet-activating factor pathway in pediatric patients with anaphylaxis.Forty-six pediatric patients (18 years) presenting with acute anaphylaxis were assessed. Anaphylaxis severity was graded and serum anaphylaxis markers were measured acutely and in 36 children who returned for follow-up4 weeks after their acute presentation. These markers were compared with pediatric laboratory reference sera.Severe anaphylaxis was experienced by 12/46 (26%) and mild-moderate anaphylaxis in 34/46 (74%) children. Platelet-activating factor acetylhydrolase (PAF-AH) activity was inversely associated with severe anaphylaxis: 9/12 children with severe anaphylaxis had reduced PAF-AH activity as compared with 14/34 with mild-moderate anaphylaxis (p.05). Furthermore, 3/3 children who required intensive care had markedly reduced mean PAF-AH (nmol/ml/min) (13.73, 95%CI: 7.42-20.03) versus 20/23 who required ward/emergency department care (17.81, 95%CI: 16.80-18.83; p.05). In children with anaphylaxis, PAF-AH during acute anaphylaxis was unchanged relative to the child's basal levels (mean, 17.26, 95%CI: 16.10-18.42 vs 17.50, 95%CI: 16.21-18.78, p = .63) and was lower than healthy pediatric controls (mean 19.21; 95%CI:18.21-20.21; p.05).Decreased serum PAF-AH activity is a biomarker of severe anaphylaxis. Levels of this enzyme do not change from basal levels during acute anaphylaxis. Our results show that PAF-AH is a biomarker of anaphylaxis severity in children. This key regulatory enzyme may modulate susceptibility to severe anaphylaxis.

Importance: There is epidemiologic evidence that the increasing incidence of thyroid cancer is associated with subclinical disease detection. Evidence for a true increase in thyroid cancer incidence has also been identified. However, a true increase in disease would likely be heralded by an increased incidence of thyroid-referable symptoms in patients presenting with disease.Objectives: To evaluate whether modes of detection (MODs) used to identify thyroid nodules for surgical removal have changed compared with historic data and to determine if MODs vary by geographic location.Design, Setting, and Participants: This was a retrospective analysis of pathology and medical records of 1328 patients who underwent thyroid-directed surgery in 16 centers in 4 countries: 4 centers in Canada, 1 in Denmark, 1 in South Africa, and 12 in the US. The participants were the first 100 patients (or the largest number available) at each center who had thyroid surgery in 2019. The MOD of the thyroid finding that required surgery was classified using an updated version of a previously validated tool as endocrine condition, symptomatic thyroid, surveillance, or without thyroid-referable symptoms (asymptomatic). If asymptomatic, the MOD was further classified as clinician screening examination, patient-requested screening, radiologic serendipity, or diagnostic cascade.Main Outcomes and Measures: The MOD of thyroid nodules that were surgically removed, by geographic variation; and the proportion and size of thyroid cancers discovered in patients without thyroid-referable symptoms compared with symptomatic detection. Data analyses were performed from April 2021 to February 2022.Results: Of the 1328 patients (mean [SD] age, 52 [15] years; 993 [75%] women; race/ethnicity data were not collected) who underwent thyroid surgery that met inclusion criteria, 34% (448) of the surgeries were for patients with thyroid-related symptoms, 41% (542) for thyroid findings discovered without thyroid-referable symptoms, 14% (184) for endocrine conditions, and 12% (154) for nodules with original MOD unknown (under surveillance). Cancer was detected in 613 (46%) patients; of these, 30% (183 patients) were symptomatic and 51% (310 patients) had no thyroid-referable symptoms. The mean (SD) size of the cancers identified in the symptomatic group was 3.2 (2.1) cm (median [range] cm, 2.6 [0.2-10.5]; 95% CI, 2.91-3.52) and in the asymptomatic group, 2.1 (1.4) cm (median [range] cm, 1.7 [0.05-8.8]; 95% CI, 1.92-2.23). The MOD patterns were significantly different among all participating countries.Conclusions and Relevance: This retrospective analysis found that most thyroid cancers were discovered in patients who had no thyroid-referable symptoms; on average, these cancers were smaller than symptomatic thyroid cancers. Still, some asymptomatic cancers were large, consistent with historic data. The substantial difference in MOD patterns among the 4 countries suggests extensive variations in practice.

IMPORTANCE: Patients with head and neck cancer manage a variety of symptoms at home on an outpatient basis. Clinician review alone often leaves patient symptoms undetected and untreated. Standardized symptom assessment using patient-reported outcomes (PROs) has been shown in randomized clinical trials to improve symptom detection and overall survival, although translation into real-world settings remains a challenge. OBJECTIVE: To better understand how patients with head and neck cancer cope with cancer-related symptoms and to examine their perspectives on standardized symptom assessment. DESIGN, PARTICIPANTS, AND SETTING: This was a qualitative analysis using semistructured interviews of patients with head and neck cancer and their caregivers from November 2, 2020, to April 16, 2021, at a regional tertiary center in Canada. Purposive sampling was used to recruit a varied group of participants (cancer subsite, treatment received, sociodemographic factors). Drawing on the Supportive Care Framework, a thematic approach was used to analyze the data. Data analysis was performed from November 2, 2020, to August 2, 2021. MAIN OUTCOMES AND MEASURES: Patient perception of ambulatory symptom management and standardized symptom assessment. RESULTS: Among 20 participants (median [range] age, 59.5 [33-74] years; 9 [45%] female; 13 [65%] White individuals), 4 themes were identified: (1) timely physical symptom management, (2) information as a tool for symptom management, (3) barriers to psychosocial support, and (4) external factors magnifying symptom burden. Participants’ perceptions of standardized symptom assessment varied. Some individuals described the symptom monitoring process as facilitating self-reflection and symptom detection. Others felt disempowered by the process, particularly when symptom scores were inconsistently reviewed or acted on. CONCLUSIONS AND RELEVANCE: This qualitative analysis provides a novel description of head and neck cancer symptom management from the patient perspective. The 4 identified themes and accompanying recommendations serve as guides for enhanced symptom monitoring.