Background: Medullary carcinoma of the small intestine is an exceptionally rare subtype of gastrointestinal cancer, characterized by its solid growth pattern and lack of glandular structures, which complicate timely diagnosis. During the COVID-19 pandemic, diagnostic delays for rare cancers became increasingly common due to the prioritization of COVID-related cases and patient reluctance to seek medical attention. Methods and Result: We present the case of a 70-year-old male initially misdiagnosed with COVID-19, whose persistent symptoms led to the eventual discovery of medullary carcinoma. Imaging studies revealed focal lesions in the liver, spleen, and thickened small intestinal walls, prompting surgical resection of a 16 cm intestinal segment. Histopathological examination confirmed medullary carcinoma with lymph node and liver metastases, supported by immunohistochemistry, which showed positive markers (calretinin, pancytokeratin, cytokeratin 7) and excluded other malignancies. Conclusions: The diagnostic delay, exacerbated by the pandemic, highlights the challenges of distinguishing rare cancers from more common conditions during global health crises. This case underscores the importance of advanced diagnostic techniques, such as immunohistochemistry, for accurate identification. Maintaining robust cancer diagnostic pathways during emergencies is crucial to avoid delays in treatment. Future research should focus on improving screening methods for rare cancers and developing resilient healthcare systems to mitigate similar challenges in future crises.

Excessive amounts of free-oxygen radicals produced during inflammation induce oxidative stress and lead to cell damage, thus delaying the transition of inflammation into the proliferation in the wound healing process. Oxidative stress on skin cells also plays an important role in the pathogenesis of inflammatory skin diseases. The aim of the planned in vitro studies was to assess the mechanisms of regenerative action and protection of cells against oxidative stress of three oil emulsions from transgenic (GMO) flax varieties M, B, and MB and a linseed emulsion from traditional NIKE linseed oil. Antioxidant and gene-protective properties were identified for the tested oil emulsions in a healthy cell model and in an in vitro model of cells under oxidative stress. The wound-healing regenerative potential of these linseed emulsions was also assessed in the proliferation, cell cycle, migration, and apoptosis and necrosis assays. The conducted research presented that the tested transgenic oil emulsions are safe for human skin because they do not induce the proliferation of skin cancer cells and, at the same time, induce the migration processes of normal human skin cells. Additionally, their use increases the ability to eliminate damaged cells. Transgenic linseed oils provide a gene-protective effect and an increased antioxidant effect, resulting in increased protection of skin cells against oxidative stress, which plays an important role in the pathogenesis of atopic dermatitis and psoriasis. Linen emulsion B has the best regenerative and protective properties against human epidermis cancer, which is probably due to the presence of an increased amount of stigmasterol in its composition along with the appropriate content of polyphenol compounds, as well as an increased amount of oleic and linoleic acids.

Background/Objectives: Hypothyroidism, including subclinical hypothyroidism, may affect mental health in children and adolescents through disturbances of neurotransmission and dysregulation of the hypothalamic–pituitary–thyroid and stress axes. Anxiety disorders are common in this population and frequently coexist with somatic symptoms overlapping those of hypothyroidism, complicating diagnosis and treatment. This study aimed to evaluate the association between levothyroxine treatment for hypothyroidism and the need for psychiatric interventions in children and adolescents with anxiety disorders. Methods: A retrospective cohort study was performed using data from the TriNetX global research network. Patients aged 5–18 years with diagnoses of hypothyroidism (ICD-10: E03) and anxiety disorders (ICD-10: F41) were included. Two propensity score–matched cohorts were analysed: patients treated with levothyroxine (n = 1861) and untreated patients (n = 1861). Outcomes included psychiatric hospitalisations, use of selective serotonin reuptake inhibitors and tricyclic-like antidepressants, frequency of psychiatric and psychotherapeutic consultations, and the occurrence of suicidal ideation and self-harm. Results: Levothyroxine treatment was associated with lower odds of SSRI use (OR = 0.58; p < 0.001), fewer psychiatric consultations (OR = 0.48; p < 0.001), and lower recorded use of psychotherapy (OR = 0.75; p = 0.029). Suicidal ideation and self-harm were recorded less frequently in the treated group (OR = 0.53; p = 0.001). No significant differences were observed in psychiatric hospitalisation rates. Use of tricyclic-like antidepressants was uncommon and did not differ significantly between groups. Conclusions: Among children and adolescents with comorbid anxiety disorders, levothyroxine treatment for hypothyroidism is associated with lower recorded utilization of certain psychiatric services and lower recorded rates of suicidal ideation and self-harm. Due to the retrospective design, causal inferences cannot be made, and the findings should be considered hypothesis-generating, requiring confirmation in prospective studies with standardised psychiatric outcome measures.

The aim of the present study was to evaluate the morphogenetic efficiency of the new flax (Linum usitatissimum L.) cultivar Silesia. The plant material consisted of five ecotypes of Silesia seeds selected by determining the fatty acid composition in individual plants. Thus, five ecotypes with different fatty acid compositions were applied for germination, and the resulting seedlings were used for callus induction. The observed in vitro morphogenic response of explants to the used callus induction medium was 100%, followed by varying development of shoots, with the highest value being 17 shoots per callus, with an average length of 7.15 cm (for ecotype 1). The biochemical analyses showed photosynthetic pigments were significantly affected by the tested ecotypes. The main conclusion is that the selection of plant material as a source of tissue cultures is crucial for efficient regeneration and organogenesis. One factor potentially influencing these processes is fatty acid composition and the ratio of linoleic to α-linolenic acid. A ratio ranging from 1.36 to 1.68 in the source material (seeds) used for initiation of tissue cultures resulted in the highest efficiency of shoot regeneration and number of obtained shoots per callus. A strong negative correlation (−0.78) was observed between shoot regeneration efficiency and the ratio of linoleic to α-linolenic acid in seeds from which the explants were obtained. Moreover, an efficient protocol of micropropagation from callus tissue was established for the new flax cultivar Silesia. An interesting insight into the metabolism of the obtained regenerants allowed us to determine the relationship between the content of chlorophyll and rhizogenesis efficiency. For these two parameters, the calculated correlation coefficient was 0.66. A strong relationship (high correlation coefficient: 0.79) was also established between flavonoid content and length of obtained regenerants, pointing to the developmental role of flavonoids.

The purpose of this study was to present a chemical analysis of the metabolome of cell aggregates of the tree fern Cyathea smithii (J.D. Hooker) cell suspension culture. The LC/MS and GC/MS techniques were used for identification of metabolites. The kinetics of fresh weight, dry weight, and ash content showed 3.5-fold increases during 15-day-long culture. The analysis demonstrated high metabolic activity of cultured cells. In total, 160 metabolites from primary and secondary metabolism and almost 2000 compounds of unknown identity were identified. Three flavonoids—the chalcone isookanin [(2S)-2-(3,4-dihydroxyphenyl)-7,8-dihydroxy-2,3-dihydrochromen-4-one], a methoxy derivative of the flavone gardenin B (5-Hydroxy-2-(4-methoxyphenyl)-6,7,8-trimethoxy-4H-1-benzopyran-4-one), and the isoflavone tectoridin (4′,5-Dihydro-6-methoxy-7-(O-glucoside)isoflavone)—had not been previously detected in the cell culture of C. smithii. Principal component analysis revealed five distinct groups of samples; groups 4 and 5 showed the greatest similarity and corresponded to cultures on days 12 and 15, respectively. The number of differentiating compounds was 75, indicated by a heatmap showing positive and negative correlations between the days of culture. The studies described in this paper are crucial for further identification of metabolites and establishing the relationship between the metabolic composition of tree fern cells in culture and their biological activity, assessed by physiological parameters. By determining the relationship between the chemical composition of cells and their growth from culture initiation to senescence, we will provide a more complete picture of the potential for environmental factors to regulate this relationship. Based on previous studies, environmental stimuli such as electromagnetic fields or light of different wavelengths can result in altered growth physiology and cell mass, as well as metabolite diversification and accumulation. The research results presented in this paper provide a foundation for further studies aimed at predicting and regulating the productivity of C. smithii cells in suspension culture and elucidating the significance of tree fern-derived metabolic products in human cell biology, particularly in thyroid cells.