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Type 2 diabetes affects over 400 million people worldwide and requires lifelong management through continuous monitoring of laboratory values, medications, and comorbidities, yet the use of longitudinal electronic health records for research is restricted by privacy regulations such as HIPAA and GDPR, making synthetic data generation an important alternative for preserving utility while protecting confidentiality. However, existing synthetic data models often fail to accurately capture temporal treatment effects and the gradual development of comorbidities, limiting their usefulness for downstream clinical and machine learning applications. To address this, a time-series generative adversarial network is proposed for longitudinal diabetes data, incorporating a temporal encoder for irregular sampling, a treatment-conditioned generator, and dual discriminators that evaluate both static patient characteristics and dynamic clinical trajectories to ensure consistency between interventions and outcomes. By explicitly modeling temporal dependencies and comorbidity structures, the framework produces more realistic synthetic patient records that better reflect disease progression and medication-response relationships, thereby enabling privacy-preserving data sharing while supporting robust secondary analyses and future applications in chronic disease modeling.

Generative artificial intelligence (AI), including GANs, VAEs, and diffusion models, is increasingly used for synthesizing and enhancing medical images, helping address challenges such as limited data, expensive acquisition, and rare disease representation. This systematic review examines studies on generative AI methods for MRI, CT, X-ray, and pathology image synthesis from 2017 to 2026, focusing on synthesis tasks, evaluation strategies, and clinical utility. A PRISMA 2020-compliant search of PubMed, IEEE Xplore, Scopus, and Web of Science identified peer-reviewed research on generative models for medical image synthesis, augmentation, harmonization, or cross-modality translation. Findings show a shift from GAN-based methods to diffusion models post-2022, with MRI and CT studies emphasizing cross-modality translation, and X-ray and pathology studies focusing on augmentation and diagnostic utility. Despite GANs' continued dominance, diffusion models are gaining traction for improving image fidelity and diversity. However, evaluation practices remain inconsistent, with limited inclusion of clinically relevant assessments. This review follows PRISMA 2020 guidelines and provides a narrative synthesis of the evidence.