What Thor: Love and Thunder Can Teach Us About Metastatic Breast Cancer

On screen

In Thor: Love and Thunder (2022), the scientist Jane Foster is living with stage IV breast cancer while also taking up the mantle of the Mighty Thor. The film treats her illness with unusual seriousness for a superhero movie, weaving her diagnosis through the story rather than tucking it away. Behind the fantasy, Jane's situation gives us a chance to talk plainly about what "stage IV" — advanced, metastatic breast cancer — actually means.

The reality

Breast cancer is cancer that starts in the breast, and it can begin in one or both breasts. According to the National Cancer Institute, it happens when cells in the breast grow without control, forming a mass called a tumor that may spread elsewhere in the body. Breast cancer mostly affects females aged 45 and older, but anyone with breasts can develop it. It is rare in children and in males.

Breast cancer can form in different parts of the breast — the glandular tissue that makes and carries milk (ducts and lobules), the fibrous and fatty tissue that gives the breast its shape, the nipple, and even the blood and lymph vessels. Most breast cancers are ductal cancers, which begin in the milk ducts.

There are many types of breast cancer, and NCI explains that they differ by where the cancer begins and how far it has spread. When abnormal cells stay within the ducts or lobules and have not spread, it is called carcinoma in situ. Invasive cancers have grown into surrounding breast tissue and can spread to nearby lymph nodes or to other organs. Most breast cancers are invasive.

That word "spread" is where staging comes in. NCI describes stage as the extent of a cancer — how large the tumor is and whether it has spread. In the common system, Stage IV (stage 4) means the cancer has spread to distant parts of the body. That distant spread is what "metastatic" refers to. Jane's stage IV diagnosis places her cancer in this category.

What the story gets right — and what to remember

The film's core detail — that stage IV means the cancer has traveled beyond where it began — matches how NCI describes staging. What a movie can't show is how different every real person's experience is. NCI notes that a cancer is always referred to by the stage it was given at diagnosis, even if it later changes, and that staging helps a care team understand the situation and plan treatment.

A story is not a prognosis. Jane's arc is written for drama, not as a guide to anyone's diagnosis, and nothing here is medical advice. Real decisions belong with a person and their healthcare team.

Awareness, screening & prevention

NCI's overview of breast cancer emphasizes understanding what the disease is and who can get it: while it most often affects women 45 and older, anyone with breast tissue can be affected, and it can start in one or both breasts. Recognizing that breast cancer can be invasive and can spread to lymph nodes or other organs is part of why staging and follow-up matter. For screening guidance specific to breast cancer, NCI maintains dedicated screening pages that a healthcare team can help interpret for an individual's situation.

Turning a story into something useful

A superhero film reaching millions of people is a rare chance to make an advanced diagnosis feel a little less mysterious. Learning what "stage IV" and "metastatic" actually mean, sharing that understanding with the people around you, and bringing questions to a healthcare team all turn a moment of entertainment into something genuinely useful. Supporting free, accurate cancer education helps keep this kind of plain-language information available to anyone who needs it.

Questions to ask a healthcare team

• What does the stage of a breast cancer describe, and how is it determined?
• What is the difference between in situ, invasive, and metastatic breast cancer?
• What tests are used to learn whether a cancer has spread?
• Where can I find reliable, plain-language information about breast cancer and staging?