Bioengineering, Vol. 12, Pages 1001: Enhancing Melanoma Diagnosis in Histopathology with Deep Learning and Synthetic Data Augmentation

Bioengineering doi: 10.3390/bioengineering12091001

Authors:
Alex Rodriguez Alonso
Ana Sanchez Diez
Goikoane Cancho Galán
Rafael Ibarrola Altuna
Gonzalo Irigoyen Miró
Cristina Penas Lago
Mª Dolores Boyano López
Rosa Izu Belloso

Accurate diagnosis of melanoma using hematoxylin and eosin (H&E)-stained histological images is often challenged by the scarcity and imbalance of biomedical datasets, limiting the performance of deep learning models. This study investigates the impact of synthetic image generation, via generative adversarial networks (GAN), on training automatic classifiers based on the ResNet-18 architecture. Two experimental setups were designed: one using only real images and another combining real images with synthetic ones of the melanocytic nevus class to balance the dataset. Models were trained and evaluated at resolutions up to 1024 × 1024 pixels, employing standard classification metrics and the Fréchet Inception Distance (FID) to assess the quality of the generated images. The results suggest that although mixed models do not consistently outperform those trained exclusively on real data, they achieve competitive performance, particularly in terms of specificity and reduction in false negatives. This study supports the use of synthetic data as a complementary tool in scenarios where the acquisition of new samples is limited and lays the groundwork for future research in conditional generation and synthesis of malignant samples. In our best-performing model (1024 × 1024 px, 50 epochs, mixed dataset), we achieved an accuracy of 96.00%, a specificity of 97.00%, and a reduction in false negatives from 80 to 75 cases compared with real-only training. These results highlight the potential of synthetic augmentation to improve clinically relevant outcomes, particularly in reducing missed melanoma diagnoses.

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Alex Rodriguez Alonso www.mdpi.com