The Real Cancers Behind The Fault in Our Stars

On screen

This page looks at the two real cancers in the film The Fault in Our Stars: thyroid cancer and osteosarcoma. It explains what the film shows accurately and where it compresses the medicine.

"The Fault in Our Stars," the 2014 film based on John Green's novel, opens with Hazel Grace Lancaster wheeling an oxygen tank down a hallway. She's headed to a teen cancer support group she resents attending. She has stage IV thyroid cancer that has spread to her lungs. That's why she needs extra oxygen through a nasal cannula. At the group she meets Augustus "Gus" Waters. He's a former basketball player who lost a leg to osteosarcoma and is, for the moment, in remission.

Their romance, road trip to Amsterdam included, unfolds against the backdrop of scans, side effects, and the specific loneliness of being seriously ill as a teenager. Later in the story, Gus's cancer returns. The film shifts from "living with illness" to "dying from it."

The movie doesn't dwell on lab values or treatment protocols. It doesn't need to — it's a story about two people, not a case study. But the two cancers it chose are real, well-studied diseases. Knowing more about them adds weight to what the characters are going through.

The reality

Hazel's cancer. According to the National Cancer Institute (NCI), thyroid cancer comes in several forms. The most common types are papillary and follicular thyroid cancers. NCI describes them as cancers that "can be treated and can usually be cured," especially when caught before they spread far. That's the good news. It makes thyroid cancer, as a category, one of the more treatable solid tumors.

Hazel's situation is different. Her cancer has spread to her lungs, which makes it stage IV disease. NCI notes that once thyroid cancer reaches the lungs or bones, "treatment usually does not cure the cancer," though it "can relieve symptoms and improve the quality of life."

Standard care at that stage can include surgical removal of the thyroid, radioactive iodine therapy, external radiation, and targeted drugs called tyrosine kinase inhibitors (for example, sorafenib or lenvatinib). Those drugs work against certain thyroid cancers that no longer respond to radioactive iodine. Hazel's oxygen tank is a plausible detail. Lung spread can reduce the amount of working lung tissue and make breathing harder. That fits why a teenager might need extra oxygen, even while otherwise mobile and active.

Gus's cancer. Osteosarcoma is a cancer of bone-forming cells. It's notably a young person's disease. NCI reports that about 440 cases are diagnosed each year in people 19 and younger in the United States. It most often arises in the long bones near the knee, which fits Gus's leg.

Treatment typically combines chemotherapy with surgery. NCI is specific on one point that often surprises people: "survival is the same whether the first surgery done is a limb-sparing surgery or an amputation." The choice is about function and quality of life. It's not about which option gives a better chance of survival. NCI also notes that osteosarcoma often comes back in the lungs or bones, usually within about 18 months of finishing treatment. That fits the film's plot turn when Gus's cancer resurfaces.

Where the story compresses

Real oncology involves more waiting, more scans, and more uncertainty than a two-hour film can show. Diagnosis alone takes imaging, biopsy, staging, and a treatment plan built by a team of specialists. That typically unfolds over weeks, not scenes. The film also keeps lab work, side effects like nausea or low blood counts from chemotherapy, and the financial and logistical grind of cancer care mostly offscreen. It focuses instead on how illness reshapes relationships, identity, and the ordinary business of being a teenager.

Prognosis is handled loosely too, which is common in film generally. Real outcomes for both cancers depend heavily on specific factors: cancer subtype, exact stage, how a tumor responds to treatment, and overall health. These vary enormously from patient to patient. The film's version of "terminal" versus "in remission" is simpler and more either-or than what actually plays out in clinic. There, scans, remission, and recurrence often happen in a more uncertain rhythm, over months or years.

What the film gets right, and gets right well, is the emotional terrain. There's the fear that sits underneath routine checkups. There's the strain illness puts on friendships and family. There's the specific frustration of a body that won't cooperate with plans. And there's the exhausting, unglamorous reality of being a patient — the tank, the pills, the appointments — even during the good stretches.

What to keep in perspective

• Thyroid cancer, as a whole, is often very treatable; Hazel's case reflects the harder subset that has spread to distant organs.
• Osteosarcoma mainly affects teens and young adults, and limb-sparing surgery offers survival equal to amputation when it's a medically appropriate option.
• A film's timeline and prognosis are dramatized; real diagnosis, treatment, and follow-up for either cancer typically involve a longer and more individualized path.

Sources

• National Cancer Institute, "Thyroid Cancer Treatment (PDQ)–Patient Version": https://www.cancer.gov/types/thyroid/patient/thyroid-treatment-pdq
• National Cancer Institute, "Osteosarcoma and Undifferentiated Pleomorphic Sarcoma of Bone Treatment (PDQ)–Patient Version": https://www.cancer.gov/types/bone/patient/osteosarcoma-treatment-pdq

How this article was prepared

An AI-assisted editorial system helped prepare this page. No named medical reviewer has reviewed it unless one is listed.

Cancer Explained is published by the National Cancer Information Foundation. It is not medical advice and does not suggest a test or treatment.

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