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Human Chorionic Gonadotropin (hCG) Levels and Cancer

Written by Puya Yazdi, MD | Reviewed by Ana Aleksic, MSc (Pharmacy) | Last updated:
Jonathan Ritter
Medically reviewed by
Jonathan Ritter, PharmD, PhD (Pharmacology) | Written by Puya Yazdi, MD | Reviewed by Ana Aleksic, MSc (Pharmacy) | Last updated:

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hCG and cancer
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Human chorionic gonadotropin (hCG) is best known for turning pregnancy tests positive, but extremely high levels may point to cancer. Find out how doctors use this test to assist them in making a diagnosis and what levels are considered normal or high.

What is hCG (Human Chorionic Gonadotropin)?

Definition

Human chorionic gonadotropin (hCG) is a hormone well-known for initiating a pregnancy. Its main function is to support the development of a newly fertilized egg [1].

It increases progesterone and helps grow blood vessels in the uterus, which provides a blood supply and nourishment to the growing fetus [2].

This makes hCG useful as an indicator of pregnancy. Most pregnancy tests will check for the presence of hCG either in the urine or blood. To learn more about how hCG is used in a pregnancy test, check out this post [1].

The fact that testing hCG levels can help detect certain kinds of cancer – including ovarian cancer in women and testicular cancer in men – is not as well-known [2].

hCG is normally produced during early pregnancy, but high levels may indicate the presence of certain types of cancer, including ovarian and testicular cancer.

hCG and Cancer

Types of hCG and Cancer

5 different types of hCG exist and they all work together, but each has a unique structure and function (sulfated hCG, hyperglycosylated hCG, hyperglycosylated hCG free β-subunit, and hCG free β-subunit) [1].

The cells in your body naturally go through a process called apoptosis, whereby certain old or damaged cells die off; this process is essential to maintain good health. Some forms of hCG (hyperglycosylated hCG and the free β-subunit types) can block apoptosis, leading to rapid cellular growth [2, 1].

Blocking apoptosis serves an important function in pregnant women: it promotes the development and growth of the embryo and placenta [2, 1].

However, high hCG levels outside of pregnancy can stimulate the growth of cancers that affect the uterus, placenta, and testicles. On top of that, some cancer cells themselves can release β-hCG, which can further accelerate cancer growth [2, 1].

High hCG promotes rapid cellular growth, which may stimulate the development of cancer or worsen cancer prognosis in some cases.

Tumors that Produce hCG

Many different kinds of tumors produce hCG, especially the free β-subunit type of hCG. High levels of β-hCG may indicate a particularly aggressive form of cancer. For this reason, hCG and β-hCG levels can help diagnose and monitor several types of cancer [3].

About 10-30% of most cancer patients (like those with lung, breast, or prostate cancer) have elevated levels of hCG. However, hCG tests are most useful for diagnosing ovarian and testicular cancer, which almost always cause high hCG levels [3, 4].

It’s true that high hCG levels can produce a positive pregnancy test result in men with certain types of cancer. One such case was widely covered in the media: a teenage boy took a pregnancy test as a joke, got a positive result, and was diagnosed with testicular cancer afterward.

However, home pregnancy tests are in no way a reliable way to diagnose any type of cancer. If your doctor suspects cancer is increasing your hCG levels, they’ll run a sensitive blood test.

On the other hand, if you are a healthy woman trying to conceive and you got a positive pregnancy test result, you probably don’t have to worry about ovarian cancer. In any case, your doctor will run additional tests afterward to confirm your pregnancy and make sure it’s progressing normally.

Elevated hCG or β-hCG levels may indicate ovarian or testicular cancer.

Normal & High Levels

In healthy adults, hCG and β-hCG levels are normally very low. For non-pregnant women, normal levels are [3]:

  • hCG: <5 mIU/mL
  • β-hCG: <0.04 mIU/mL

For men, normal levels are [3]:

  • hCG: <2 mIU/mL
  • β-hCG: <0.05 mIU/mL

However, these reference ranges may vary depending on the health organization. Also, some labs may set the upper limit of hCG to 10 mIU/mL because their tests cannot detect such low levels of hCG [3, 4].

There is also no set value for a cancer diagnosis. Generally speaking, any level above normal may indicate cancer. Often it’s not hard to tell, since hCG levels can skyrocket to 300-10,000 mIU/mL in some types of cancer [3, 4].

If your hCG or β-hCG levels are high, your doctor may pursue more aggressive or longer treatment options [3, 4].

Normal hCG levels in non-pregnant women are below 5 mIU/mL and in men below 2 mIU/mL. Very high levels may indicate cancer.

Takeaway

Ovarian and testicular cancer can dramatically increase hCG levels. Other cancer types, such as breast and lung cancer, may also increase hCG blood levels. High hCG levels further feed the growth of tumors and the blood vessels that feed them.

Pregnancy tests should never be used to screen for these cancer types. Your doctor will check your hCG levels with a sensitive blood test if he or she suspects you have cancer.

About the Author

Puya Yazdi

Puya Yazdi

MD
Dr. Puya Yazdi is a physician-scientist with 14+ years of experience in clinical medicine, life sciences, biotechnology, and nutraceuticals.
As a physician-scientist with expertise in genomics, biotechnology, and nutraceuticals, he has made it his mission to bring precision medicine to the bedside and help transform healthcare in the 21st century.He received his undergraduate education at the University of California at Irvine, a Medical Doctorate from the University of Southern California, and was a Resident Physician at Stanford University. He then proceeded to serve as a Clinical Fellow of The California Institute of Regenerative Medicine at The University of California at Irvine, where he conducted research of stem cells, epigenetics, and genomics. He was also a Medical Director for Cyvex Nutrition before serving as president of Systomic Health, a biotechnology consulting agency, where he served as an expert on genomics and other high-throughput technologies. His previous clients include Allergan, Caladrius Biosciences, and Omega Protein. He has a history of peer-reviewed publications, intellectual property discoveries (patents, etc.), clinical trial design, and a thorough knowledge of the regulatory landscape in biotechnology.He is leading our entire scientific and medical team in order to ensure accuracy and scientific validity of our content and products.

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