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Tumor histology: a detailed review of the significance and current possibilities
Tumor histology — is a fundamental diagnostic method in oncology, without which it is impossible to establish an accurate diagnosis. It is thanks to the study of tissue samples under a microscope that doctors get the answer to the main question: is the neoplasm malignant, and if so, what type and level aggressiveness. The choice of treatment, the prognosis for the patient, and the possibility of using innovative therapy methods depend on this.
The role of histology in modern medicine
Tumor histology is the «gold standard» of diagnosis, recognized by all leading medical organizations in the world, including the WHO and the American Society of Clinical Oncology. Unlike imaging methods such as MRI or CT, which only show the size and location of a tumor, histology allows us to reveal its cellular structure. This is fundamentally important, because two seemingly identical tumors can differ in origin and aggressiveness.
Stages of histological examination of tumors
Histology involves several sequential steps:
Obtaining a biopsy specimen — a piece of tissue is taken during surgery or biopsy.
Fixation — the material is stored in a formalin solution to stop the decomposition of the cells.
Processing — the tissue is dehydrated and embedded in paraffin.
Section preparation — a special microtome makes ultrathin sections several micrometers thick.
Dyeing — dyes are used (most often hematoxylin and eosin) that make cellular structures visible.
Analysis under a microscope — the pathologist evaluates the shape of the cells, their distribution, the presence of mitoses, and other signs.
What does tumor histology show?
The study answers the following key questions:
benign or malignant tumor;
histological type (adenocarcinoma, sarcoma, squamous cell carcinoma, etc.);
the degree of cell differentiation (the lower the degree, the more aggressive the neoplasm);
presence of invasion into neighboring tissues;
probability of metastasis.
Types of tumors and their histological features
| Tumor type | Origin | Histological signs | Forecast |
|---|---|---|---|
| Adenocarcinoma | Glandular tissue (lung, gastrointestinal tract, pancreas) | Formation of glandular structures | Varies depending on stage, high risk of metastasis |
| Sarcoma | Connective tissue (bones, muscles) | High cellular atypism, rapid growth | Aggressive course, early metastases |
| Squamous cell carcinoma | Epithelial cells (skin, mucous membranes) | Plates of squamous cells, keratinization | Often locally aggressive |
| Benign tumors (lipoma, fibroma) | Fatty, connective tissue | Highly differentiated cells, no invasion | Favorable prognosis, recurrences are rare |
Modern methods in histology
Today, classical methods are complemented by new technologies.
Immunohistochemistry allows you to identify protein markers that indicate the type of tumor and its potential sensitivity to drugs.
Molecular pathology examines genetic changes in cells. This is especially important for choosing targeted and immunotherapy.
Digital histology makes it possible to scan slices and analyze them using software and artificial intelligence.
Clinical significance of histology
Histology results affect all stages of treatment: from diagnosis to the choice of therapeutic strategy. For example, in breast cancer Histology determines the receptor status of the tumor (HER2, ER, PR), which directly affects the choice of treatment. In sarcomas, it is important to identify the degree of malignancy, as this determines the extent of surgical intervention and the need for chemotherapy.
Tumor histology is not only a method diagnostics, but also the basis of modern personalized medicine. Thanks to it, doctors have the opportunity to choose the most effective treatment, reduce the risk of relapse and significantly improve the quality and duration of life of patients.
