Cancer cells under the microscope.

Cancer is not one image. Look across living structures, stained tissue, cultured cancer cells, and three-dimensional reconstructions. Color can come from stains, fluorescent labels, or image processing—it is not a diagnosis by itself.

20 image records07 visual methods03 matched comparisons

Start with healthy vs. cancer

Fluorescence image of metastatic melanoma cells with blue nuclei and multicolored actin structures — METASTATIC MELANOMA CELLSActin-rich structures appear in yellow; nuclei in blue.NCI · PUBLIC DOMAIN ↗

Paired field studies

Same tissue type. Different architecture.

These pairs place normal tissue beside cancer from the same general organ. They are separate specimens from different sources—not before-and-after images from one person—and their scale and preparation may differ.

PAIR 01 / CONNECTIVE TISSUE

The cleanest controlled comparison in the archive.

Both fields show cultured human connective-tissue cells photographed by Dr. Cecil Fox in November 1987 using darkfield amplified contrast at 500×. The normal cells and cancer cells are not documented as coming from the same donor or specimen.

Normal human connective-tissue cells in culture using darkfield amplified contrast — **Normal connective-tissue cells**Darkfield amplified contrast, 500× · Dr. Cecil Fox / NCIRights and context ↗

Cancer cells from human connective tissue in culture using darkfield amplified contrast — **Cancer cells from connective tissue**Darkfield amplified contrast, 500× · Dr. Cecil Fox / NCIRights and context ↗

PAIR 02 / BREAST

Organized structures beside disrupted growth.

H&E staining commonly produces pink and purple tones. In normal breast tissue, cells form organized ducts and acini. The cancer image shows cells growing beyond their usual duct boundaries into surrounding tissue.

H and E stained normal breast tissue showing organized ducts, lobules, and an acinus — **Normal breast histology**H&E · Mikael Häggström, M.D. · CC BY 4.0Rights and context ↗

H and E stained breast cancer cells growing into surrounding tissue — **Breast cancer histology**H&E, 200× · Dr. Cecil Fox / NCI · Public domainRights and context ↗

PAIR 03 / COLORECTAL

Orderly mucosa beside irregular glands.

Normal colorectal mucosa forms repeated glandular structures with abundant mucus-producing goblet cells. In colorectal adenocarcinoma, gland shapes and the arrangement of cells can become irregular and crowded.

H and E stained normal colorectal mucosa at high magnification — **Normal colorectal mucosa**H&E biopsy · Librepath · CC BY-SA 3.0Rights and context ↗

H and E stained colorectal adenocarcinoma at high magnification — **Colorectal adenocarcinoma**H&E · Nephron · CC BY-SA 3.0Rights and context ↗

Look for patterns, not a self-diagnosis. Pathologists interpret complete specimens together with clinical and laboratory information. These comparisons are educational and cannot show whether any individual has cancer.

Enter the full field

Twenty views of the unseen.

Select an image to enlarge it and reveal the method, scientific context, creator, and rights record.

What the eye can miss

Color is added. Context is essential.

STAIN

H&E makes tissue readable.

Hematoxylin commonly colors nuclei blue-purple, while eosin colors many surrounding structures pink. The result is prepared contrast, not the natural color of living tissue.

LABEL

Fluorescence tracks selected structures.

Fluorescent markers can highlight nuclei, proteins, or the cell’s internal scaffold. Colors represent chosen signals and may vary between experiments.

FORM

Electron microscopy reveals surfaces.

Electron microscopes resolve structures far smaller than light microscopes. Color may be added later to help separate forms or create visual clarity.

Learn how pathologists build a diagnosis →

Expand the field

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