science

High-grade prostatic intraepithelial neoplasia

High-grade prostatic intraepithelial neoplasia is a science topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand High-grade prostatic intraepithelial neoplasia rather than just read about it. In short: High-grade prostatic intraepithelial neoplasia (HGPIN) is an abnormality of prostatic glands and believed to precede the development of prostate adenocarcinoma (the most common form of prostate cancer). It may be referred to simply as prostatic intraepithelial neoplasia (PIN).

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Reference excerpt

High-grade prostatic intraepithelial neoplasia (HGPIN) is an abnormality of prostatic glands and believed to precede the development of prostate adenocarcinoma (the most common form of prostate cancer). It may be referred to simply as prostatic intraepithelial neoplasia (PIN). It is considered to be a pre-malignancy, or carcinoma in situ, of the prostatic glands.

Signs and symptoms HGPIN in isolation is asymptomatic. It is typically discovered in prostate biopsies taken to rule-out prostate cancer and very frequently seen in prostates removed for prostate cancer.

Relation to prostate cancer There are several reasons why PIN is the most likely prostate cancer precursor. PIN is more common in men with prostate cancer. High grade PIN can be found in 85 to 100% of radical prostatectomy specimens, nearby or even in connection with prostate cancer. It tends to occur in the peripheral zone of the prostate. With age, it becomes increasingly multifocal, like prostate cancer. Molecular analysis has shown that high grade PIN and prostate cancer share many genetic abnormalities. The risk for men with high grade PIN of being diagnosed with prostate cancer after repeat biopsy has decreased since the introduction of biopsies at more than six locations (traditional sextant biopsies).

Histology

HGPIN typically has one of four different histologic patterns:

tufted (fascicular patterning) micropapillary, cribriform and, flat. Its cytologic features are that of prostatic adenocarcinoma:

presence of nucleoli, increased nuclear-to-cytoplasmic ratio and, increased nuclear size. Microscopically, PIN is a collection of irregular, atypical epithelial cells. The architecture of the glands and ducts remains normal. The epithelial cells proliferate and crowding results in a pseudo-multilayer appearance. They remain fully contained within a prostate acinus (the berry-shaped termination of a gland, where the secretion is produced) or duct. The latter can be demonstrated with special staining techniques (immunohistochemistry for cytokeratins) to identify the basal cells forming the supporting layer of the acinus. In prostate cancer, the abnormal cells spread beyond the boundaries of the acinus and form clusters without basal cells. In HGPIN, the basal cell layer is disrupted but present. PIN is primarily found in the peripheral zone of the prostate (75-80%), rarely in the transition zone (10-15%) and very rarely in the central zone (5%), a distribution that parallels the zonal distribution for prostate carcinoma. Because it is thought to be a premalignant state, PIN is often considered the prostate equivalent of what is called carcinoma in situ (localized cancer) in other organs. However, PIN differs from carcinoma in situ in that it may remain unchanged or even spontaneously regress. Several architectural variants of PIN have been described, and many cases have multiple patterns. The main ones are tufting, micropapillary, cribriform, and flat. Although these different appearances may cause confusion with other conditions, they have not been found to be of clinical importance. Rarer types are signet-ring-cell, small-cell-neuroendocrine, mucinous, foamy, inverted, and with squamous differentiation.

Diagnosis HGPIN is diagnosed from tissue by a pathologist, which may come from:

a needle biopsy taken via the rectum and, surgical removal of prostate tissue: transurethral resection of the prostate - removal of extra prostate tissue to improve urination (a treatment for benign prostatic hyperplasia), radical prostatectomy - complete removal of prostate and seminal vesicles (a treatment for prostate cancer). Blood tests for prostate specific antigen (PSA), digital rectal examination, ultrasound scanning of the prostate via the rectum, fine needle aspiration or medical imaging studies (such as magnetic resonance imaging) are not useful for diagnosing HGPIN.

Treatment HGPIN in isolation does not require treatment. In prostate biopsies it is not predictive of prostate cancer in one year if the prostate was well-sampled, i.e. if there were 8 or more cores. The exact timing of repeat biopsies remains an area of controversy, as the time required for, and probability of HGPIN transformations to prostate cancer are not well understood.

Prognosis On a subsequent biopsy, given a history of a HGPIN diagnosis, the chance of finding prostatic adenocarcinoma is approximately 30%.

History PIN was historically subdivided into different stages, based on the level of cell atypia. PIN was formerly classified as PIN 1, 2 or 3, in order of increasing cell irregularities. Nowadays, PIN 1 is referred to as low grade PIN, and PIN 2 and PIN 3 are grouped together as high grade PIN. Only high grade PIN has been shown to be a risk factor for prostate cancer. Because low grade PIN has no significance and does not require repeat biopsies or treatment, it is not mentioned in pathology reports. As such, PIN has become synonymous with high grade PIN.

See also Atypical small acinar proliferation

References

External links

Illustrations

Worked examples

Example 1 — a first encounter with High-grade prostatic intraepithelial neoplasia

Start with the simplest possible case. Write down what High-grade prostatic intraepithelial neoplasia claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In science, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to High-grade prostatic intraepithelial neoplasia before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about High-grade prostatic intraepithelial neoplasia ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of High-grade prostatic intraepithelial neoplasia

In research: High-grade prostatic intraepithelial neoplasia appears in science research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses High-grade prostatic intraepithelial neoplasia in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: High-grade prostatic intraepithelial neoplasia is common in secondary-school and first-year university syllabi. It links to neighbouring topics Histopathology, Male genital neoplasia, so understanding it makes those chapters shorter.
In everyday life: Look for High-grade prostatic intraepithelial neoplasia outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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Frequently asked questions

What is High-grade prostatic intraepithelial neoplasia in simple terms?

Why does High-grade prostatic intraepithelial neoplasia matter?

Because it connects several science ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study High-grade prostatic intraepithelial neoplasia?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

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