science

Hormone-sensitive cancer

Hormone-sensitive cancer 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 Hormone-sensitive cancer rather than just read about it. In short: A hormone-sensitive cancer, or hormone-dependent cancer, is a type of cancer that is dependent on a hormone for growth and/or survival. Examples include breast cancer, which is dependent on estrogens like estradiol, and prostate cancer, which is dependent on androgens like testosterone.

Key takeaways

Hormone-sensitive cancer belongs to science; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Hormone-sensitive cancer to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Hormone-sensitive cancer from memory before moving on to harder problems.

Reference excerpt

A hormone-sensitive cancer, or hormone-dependent cancer, is a type of cancer that is dependent on a hormone for growth and/or survival. Examples include breast cancer, which is dependent on estrogens like estradiol, and prostate cancer, which is dependent on androgens like testosterone. Hormones can cause some tumors to grow and spread, which are so-called hormone-sensitive or hormone-dependent cancer. If a tumor is hormone-sensitive, it means that there are special proteins called receptors on cells surface. When the hormone binds to a matched receptor, it results in the growth and spread of cancer cells.

Mechanism of carcinogenesis While tumor initiating event for hormone-related cancers can be varied, the promotion event and subsequent proliferation is driven by a sex hormone. Both endogenous and exogenous hormones, by driving cell proliferation, increased the number of cell divisions and the opportunity for random genetic errors to lead to cancer.

Hormone-sensitive cancer types

Breast cancer Breast cancer is often hormone responsive, since growth or regression of tumors can often be regulated by appropriate endocrine manipulations. Estrogen and progesterone seem to be main hormones involved in growth of breast cancer.

Ovarian cancer Ovarian cancer can be affected by estrogen. β-estradiol (E2) can stimulate the growth of some estrogen receptor(ER)-positive ovarian carcinoma cells, and these effects may be related with changes in the cellular levels of steroid hormone receptors.

Uterine cancer Uterine or endometrial cancer are activated by estrogen and progesterone are related to this type. The uterine endometrium is extraordinary sensitive to steroid hormones, observation that women who ovulate and produce progesterone have an extremely low possibility to get endometrial cancer proves progesterone as a critical inhibitor of carcinogenesis.

Prostate cancer Prostate cancer is dependent on androgens like testosterone and similar hormones that can help it grow and spread.

Treatment Treatments for hormone-sensitive-cancers include blocking the synthesis or action of the hormone or surgery to remove the organ that produces the hormone. Androgen deprivation therapy includes treatment with androgen receptor antagonists and/or surgical removal of the testes while estrogen deprivation therapy involves treatment with estrogen receptor antagonists and/or surgical removal of the ovaries.

Receptor antagonists Antiandrogens or antiestrogen are used to block the binding of androgen and estrogen to their respective nuclear hormone receptors and thereby blocks the proliferative effects of these hormone on hormone dependent cancer. For example, the antiestrogen tamoxifen used for the treatment of breast cancer while the antiandrogen bicalutamide alone or in combination with castration is used to treat prostate cancer. Interruption of hormonal stimulus. For example, tamoxifen can slow the progression until actual hormone independence occurs in the pathway later. In more recent years, evidence in support of this cell proliferation model of hormone responsive cancer etiology has continued to accumulate. Anti-hormone therapies are proved to be effective in stopping progression and thereby increasing the time to recurrence or death.

Receptor agonists Progesterone is regarded as the major endometrial tumor suppressor,

Synthesis inhibitors Various agents that block key events in the synthesis of hormones are sometimes used to treat hormone dependent cancers. Aromatase inhibitors such as anastrozole block the synthesis of estrogen while CYP17A1 inhibitors such as abiraterone block the synthesis of androgen. Gonadotropin-releasing hormone antagonists blocks the signaling that stimulates androgen synthesis.

Surgery As the growth of hormone dependent cancer is driven by sex hormones, surgical removal of the organs that synthesizes the sex hormone is sometimes performed. In the case of prostate cancer, orchiectomy (surgical castration) of the testes is sometimes performed while oophorectomy (surgical removal of the ovaries) is sometimes performed to prevent breast cancer in high risk women with BRCA1 or BRCA2 mutations.

References

Worked examples

Example 1 — a first encounter with Hormone-sensitive cancer

Start with the simplest possible case. Write down what Hormone-sensitive cancer 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 Hormone-sensitive cancer 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 Hormone-sensitive cancer 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 Hormone-sensitive cancer

In research: Hormone-sensitive cancer 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 Hormone-sensitive cancer 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: Hormone-sensitive cancer is common in secondary-school and first-year university syllabi. It links to neighbouring topics Types of cancer, so understanding it makes those chapters shorter.
In everyday life: Look for Hormone-sensitive cancer 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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How to study Hormone-sensitive cancer in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Hormone-sensitive cancer means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Hormone-sensitive cancer out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Hormone-sensitive cancer in simple terms?

Why does Hormone-sensitive cancer 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 Hormone-sensitive cancer?

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?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Hormone-sensitive cancer.