The short answer
Billi's grandmother is diagnosed with stage IV lung cancer in Changchun and the family decides she will not be told. This page sets out what US law requires about disclosure, what NCI says about using relatives as interpreters, the survival figures behind a distant-stage diagnosis, and the one lung cancer screening rule that does exist.
MedlinePlus states that by law US providers must explain a person's health condition and treatment choices to them.
NCI's communication summary says clinicians should not use a patient's family or friends as interpreters.
For people diagnosed from 2016 to 2022, NCI reports 5-year relative survival for lung cancer of 29.5 percent overall, and 10.5 percent at distant stage.
The USPSTF gives annual low-dose CT a Grade B for adults aged 50 to 80 with a 20 pack-year history who smoke now or quit within 15 years.
About this title
- Released:
- 2019
- Format:
- Feature film
- Country:
- United States / China
- Director:
- Lulu Wang
- Cancer depicted:
- Stage IV lung cancer
Search for the official trailer — we link out rather than embed a video we have not verified.
Full cast, crew and release details
This page describes a work of film or television for education. Plot details are discussed openly. Nothing here is a review of anyone’s real medical care, and a dramatised illness is not a guide to your own.
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The full explanation.
A wedding arranged as a goodbye
Billi's grandmother in Changchun is found to have stage IV lung cancer. She is given a short time to live. The family decides she will not be told. A cousin's wedding is hurried forward so everyone can gather and say goodbye without her knowing why.
Billi was raised in the United States and cannot accept it. She is also the person standing between her grandmother and the doctors. Spoilers throughout.
Disclosure norms really do differ
The film's central argument is not invented. NCI's summary on communication in cancer care has a whole section on demographic and cultural considerations. It names language, family structure and religion as things that shape what people want said, and by whom.
It also flags a risk in the other direction. NCI describes a shift away from cultural competence, which asks clinicians to learn the beliefs of particular groups. The idea replacing it is cultural humility. That means lifelong self-critique, and redressing the power imbalance between patient and physician. The film sits exactly on that line. It refuses to turn the family's choice into a lesson.
What US law gives the patient
For viewers in the United States, one thing is settled. MedlinePlus states it plainly. By law, health care providers must explain a person's health condition and treatment choices to them. That explanation is what informed consent means.
There is real room inside the rule. A patient can say they would rather not hear a prognosis. Or that a named relative should be told first. Either preference belongs in the notes. What cannot happen is a family deciding it on an adult's behalf. How much detail a person wants varies enormously, which is the subject of this page on prognosis information.
Interpreting for your own grandmother
The quiet clinical error in the film is one almost nobody names. The family is doing the translating.
NCI's guidance is direct. Health care organizations should provide language help for any patient who speaks a different language from their clinician, at no cost to the patient. Clinicians should not use a patient's family or friends to interpret. NCI gives two reasons. Relatives may not pass on everything accurately. And they may be uncomfortable delivering emotionally difficult information.
NCI adds three practical points. Telephone interpreters are about as accurate as in-person ones. In-person interpreters are still preferable for bad news or for chemotherapy consent. And the clinician should speak directly to the patient, not about her in the third person.
Billi's whole predicament is a job that was never hers to hold.
The illness that stays offscreen
Almost nothing medical is shown, so almost nothing is misrepresented. It is still worth knowing what would have been there.
NCI lists the usual presenting features of non-small cell lung cancer. A worsening cough. Chest pain. Coughing up blood. Weight loss. Breathlessness. Hoarseness.
It adds a second set, caused by pressure on nearby structures. Trouble swallowing when the esophagus is squeezed. Hoarseness when the nerve to the voice box is involved. Swelling of the face and neck veins when the large vein returning blood from the head is compressed.
One test question would matter a great deal for a woman of the grandmother's generation. NCI reports that among lung adenocarcinoma specimens, EGFR exon 19 deletions and L858R turned up in 52 percent of tumors from never-smokers. In tumors from current smokers the figure was 6 percent. A never-smoker with advanced lung cancer has a real chance of a targetable change, and of a daily pill rather than chemotherapy.
Stage IV, and what the numbers say
NCI reports a 5-year relative survival rate of 29.5 percent for lung cancer overall among people diagnosed from 2016 to 2022. Split by how far it had spread, the figures were 65.5 percent for disease still local, 38.2 percent for regional spread, and 10.5 percent for distant disease.
Stage IV is that last figure. It explains why the family's arithmetic is not simply superstition. It also explains why the conversation they are avoiding is one about goals rather than facts.
Low-dose CT: the one place with a rule
Lung cancer is unusual among the cancers in this film library, because effective screening exists.
The USPSTF recommends annual low-dose CT for adults aged 50 to 80 with a 20 pack-year smoking history who either smoke now or quit within the past 15 years. It is a Grade B recommendation. One pack-year means an average of 20 cigarettes a day for a year.
Screening stops in two situations. Once someone has gone 15 years without smoking. Or once they develop a health problem that substantially limits life expectancy, or the ability or willingness to have curative lung surgery.
The 15-year rule confuses people, and NCI explains why it exists. Smoking raises lung cancer risk about tenfold on average, compared with a lifetime nonsmoker. NCI defines that as someone who has smoked fewer than 100 cigarettes. Risk climbs with the number smoked, the years spent smoking, and how young a person started. And quitting does not reset it. Former smokers stay at raised risk for years afterward, which is exactly why the screening window stays open that long.
Two details get missed. The 2021 revision widened the age range from 55 down to 50, and cut the threshold from 30 pack-years to 20. And the criteria set who is eligible, not who is safe. See lung cancer screening for what the scan can and cannot settle.
Sources
- https://www.cancer.gov/types/lung/hp/non-small-cell-lung-treatment-pdq
- https://www.cancer.gov/about-cancer/coping/adjusting-to-cancer/communication-hp-pdq
- https://medlineplus.gov/ency/patientinstructions/000445.htm
- https://www.uspreventiveservicestaskforce.org/uspstf/recommendation/lung-cancer-screening
This page discusses The Farewell for education. It is not medical advice, and nothing here is a judgement of anyone's real medical care. Spotted an error? Please email [email protected].
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Common questions
What cancer is in The Farewell?
Stage IV lung cancer, diagnosed in Billi's grandmother in Changchun. The family keeps it from her. This page discusses the storyline openly, including how it ends.
Could a family do this in the United States?
Not in the same way. MedlinePlus states that by law health care providers must explain a person's health condition and treatment choices to them. A patient can ask not to be told, and that preference can be recorded. Relatives cannot impose it.
Is Billi doing anything wrong by translating?
The film makes her the family's channel to the doctors. NCI's communication summary advises against exactly that: clinicians should not use a patient's family members or friends to interpret, because they may not pass on everything accurately and may be uncomfortable delivering hard news.
What does stage IV lung cancer mean for the odds?
NCI reports a 5-year relative survival rate of 29.5 percent for lung cancer overall for people diagnosed from 2016 to 2022. Broken down by extent, it was 65.5 percent for local disease, 38.2 percent for regional, and 10.5 percent for distant. Stage IV is the distant group.
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Written by: Cancer ExplainedSources last checked: 2026-08-16 what this meansLast updated: 2026-08-17Next planned review: 2028-07-25
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How this page was created
Cancer Explained does not originate medical claims. Every page restates guidance already published by the National Cancer Institute, the CDC, the USPSTF and the FDA, in plain language, with the source cited so you can check the original yourself. AI does the translating and organizing; automated checks test claims, citations, clarity and safety before anything publishes. We do not employ clinicians and do not intend to — our work is translation and navigation, not clinical judgment. Nothing here is personal medical advice, and no page can account for your particular situation.
Editorial status: Source checked — This page was written with AI assistance and checked line by line against the sources listed on it. That confirms the sources support what the page says. It is not a medical review, and it does not confirm the page is complete or right for your situation.
Human medical review: not completed. Pages here are not signed off by a clinician before they publish. That is not an oversight we are quietly working around: we restate published guidance and cite it, so the authority belongs to the source rather than to us, and every page names where its claims come from — you can verify us instead of trusting us. Where a volunteer clinician has reviewed a page, their name and credentials appear on it; where no name appears, no clinician has checked it. We are glad to have reviewers and are recruiting them, and we do not hold pages back waiting for one. Use this site to understand your situation and to ask better questions of the people treating you.
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