Cancer survival rate not mean your life expectancy

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5-Year Cancer Survival Rate ≠ Only 5 Years Left to Live! Critical Care Physician: Many People Live Over 20 Years Thanks to "This Key Factor"

The 5-year cancer survival rate does not mean that a patient only has 5 years to live. Pulmonary and critical care specialist Huang Xuan explains that most cancer recurrences typically occur within the first 2 to 5 years after treatment. After surviving this period, patients may still live healthily for 20 years. The key is to receive appropriate treatment and follow-up to improve quality of life. (Image: Shutterstock)

Key Point 1: The 5-year survival rate is a statistical indicator, not equivalent to a patient having only 5 years to live.

Key Point 2: Cancer recurrence mostly occurs within the first 2 to 5 years after treatment; 5 years is an important observation point.

Key Point 3: Different diseases have different prognostic indicators; the focus is on treatment and quality of life.

Why only five years? Why not ten?

A. An Encounter in the Outpatient Clinic

In the outpatient clinic, a patient newly diagnosed with cancer remained silent for a long time before suddenly asking me:

"Doctor, do I only have five years left to live?"

I shook my head and smiled, replying:

"No."

Many people, upon hearing "5-year survival rate," mistakenly believe it's a countdown to death.

In fact, the 5-year survival rate is not lifespan, but a statistical indicator.

For example, if the 5-year survival rate for a certain cancer is 80%, it means:

Out of 100 patients, approximately 80 are still alive five years after diagnosis.

Many of these are still living healthily in the 6th, 10th, and 20th years, watching their children grow up, retiring, traveling, and even forgetting they ever had cancer.

B. Why specifically "5 years"?

Why don't doctors say you have 50 years?

The reason isn't some magical "5-year rule" for the human body.

Rather, medical research has found that most cancers, if they recur, are most likely to occur within the first 2-5 years after treatment.

For example, with cancer:

- The highest risk of recurrence for most cancers (such as breast cancer, colorectal cancer, and lung cancer) occurs within the first 2-5 years after treatment.

- If there is no recurrence within 5 years, the chance of recurrence afterward usually decreases significantly (but not zero).

Therefore, 5 years is a very representative observation point.

If this period is successfully navigated, the chance of recurrence afterward usually decreases significantly. Therefore, internationally, 5 years is considered an important milestone for assessing treatment effectiveness.

It reflects treatment effectiveness and facilitates comparisons between hospitals and research institutions worldwide, and is thus still in use today.

C. However, not all diseases are assessed based on 5-year survival rates.

In the eyes of critical care physicians, different diseases use different observation indicators:

- Acute myocardial infarction: 30-day mortality rate, 1-year survival rate.

- Sepsis: 28-day mortality rate, 90-day mortality rate.

- COVID-19: In-hospital mortality rate, 30-day mortality rate.

- Organ transplantation: 1-year, 5-year, and 10-year graft survival rates.

- Chronic kidney disease: 5-year and 10-year risk of dialysis or death.

- Dementia: Median survival is more commonly used than 5-year survival rate.

In other words, "5 years" is primarily a traditional standard in the field of cancer and is not applicable to all diseases.

Each disease has an optimal time point for prognostic assessment.

D. I finally told that patient:

"Don't mistake the 5-year survival rate for having only 5 years left to live."

What truly matters is not just how long you live, but receiving appropriate treatment, regular follow-up, and making each day healthier and of higher quality.

Medicine strives not only to prolong life, but also to prolong a quality life.

Many people, upon hearing "5-year survival rate," mistakenly believe it's a countdown to death. "The 5-year survival rate isn't a countdown; it's about living 5 years with quality."

Ask yourself: when you're healthy, do you realize how you manage to live a quality life for more than 10, 20, or 30 years...?

Do you realize how precious and valuable that life is?

And how could you bear to,

accelerate the depletion of your quality life through "smoking, drinking, staying up late, emotional instability, excessive stress..."?