A pathophysiology diagram illustrating the differences between 'Hot' and 'Cold' tumors and the role of immunotherapy in oncological treatment. The top section depicts a 'Hot Tumor' microenvironment characterized by high infiltration of T cells (teal circles) and significant expression of PD-1 (light blue) and PD-L1 (purple) surface markers. This state leads to a favorable clinical response when treated with anti-PD-1 and anti-PD-L1 monoclonal antibodies. The bottom section shows a 'Cold Tumor' with minimal T-cell infiltration and absence of PD-L1/PD-1 markers, typically resulting in poor immunotherapy outcomes. A therapeutic pathway is illustrated showing the use of a Dendritic Cell (DC) vaccine to convert a 'Cold Tumor' into a 'Transformed cold into hot tumor.' This transformation increases lymphocyte infiltration and upregulates PD-1/PD-L1 axis expression, thereby priming the tumor for a subsequent clinical response to immune checkpoint inhibitors. The diagram emphasizes key concepts in immuno-oncology, including tumor microenvironment remodeling and the synergistic potential of combining vaccines with checkpoint blockade.

A pathophysiology diagram illustrating the 'Immunogram' framework for classifying cancer-immunity phenotypes. The flow chart categorizes tumors into 'Hot' (Immunogram-I) and 'Cold' (Immunogram-II, III, and IV). The diagram maps the relationship between immune editing, positive selection, and clinical outcomes through the lens of clonal selection. Immunogram-I ('hot' and 'exhausted') is characterized by high immune editing (+++) and moderate positive selection (++), leading to a favorable clinical outcome. In the 'Cold' category, Immunogram-II ('radical') shows high positive selection (+++) and moderate immune editing (++), resulting in the worst clinical outcome. Immunogram-III ('recognizable') and Immunogram-IV ('inert') are associated with median outcomes, with Immunogram-IV exhibiting the lowest levels of both immune editing (+) and positive selection (+). Central to the diagram is a visual representation of clonal selection, showing non-malignant cells transforming into heterogeneous 'transformed cells' under immunoselective pressure. This model integrates tumor immunology with evolutionary biology to predict patient survival and potential responses to immunotherapy across diverse solid tumor types.

This pathophysiology diagram illustrates the Hypothalamic-Pituitary-Adrenal (HPA) axis and its modulation by estrogen deficiency and inflammatory cytokines. The visual content is organized into a sagittal cross-section of the human brain linked to the peripheral adrenal cortex. Key anatomical structures include the hypothalamus (specifically the paraventricular nucleus, PVN), the pituitary gland, and the adrenal gland. The hormonal cascade is shown via numbered red arrows: (1) and (2) release of CRH and AVP from the hypothalamus acting on the pituitary; (3) pituitary secretion of ACTH stimulating the adrenal cortex; and (4) subsequent release of glucocorticoids and mineralocorticoids which provide negative feedback to the brain. Modulatory pathways are represented by black and blue arrows: (6) and (7) depict how estrogen deficiency impacts the hypothalamus and pituitary, leading to HPA axis overactivation; (5) indicates the inhibitory influence of inflammatory cytokines IL-1 and TNF-alpha. This diagram serves as an educational tool for understanding neuroendocrine regulation and the impact of menopause-related hormonal changes on stress response systems.