怎样解读肠癌生存率

看到楼下某贴中提到：“当一个37岁，肠癌4期的病人问她的肿瘤医生关于化疗时，医生告诉她：化疗后的存活率是67%。。 接着这位病人又问了非常关键的问题：如果不做化疗，存活率是多少呢？医生告诉她，57%！”

对此感到十分惊喜，啥时候肿瘤治疗又有了新突破，那俺可有机会多活几年了。赶紧查，结果不给力。

下面是美国癌协网站报道，这个协会可是准专业水平的，不是民科哟。

请注意那个相对生存率（Relative survival rates）对老年患者尤为重要。

全文请见 https://www.cancer.org/cancer/colon-rectal-cancer/detection-diagnosis-staging/survival-rates.html 

摘要

What is a 5-year survival rate?

Statistics on the outlook for a certain type and stage of cancer are often given as 5-year survival rates, but many people live longer – often much longer – than 5 years. The 5-year survival rate is the percentage of people who live at least 5 years after being diagnosed with cancer. For example, a 5-year survival rate of 90% means that an estimated 90 out of 100 people who have that cancer are still alive 5 years after being diagnosed. Keep in mind, however, that many of these people live much longer than 5 years after diagnosis.

Relative survival rates are a more accurate way to estimate the effect of cancer on survival. These rates compare people with colorectal cancer to people in the overall population. For example, if the 5-year relative survival rate for a specific type and stage of cancer is 90%, it means that people who have that cancer are, on average, about 90% as likely as people who don’t have that cancer to live for at least 5 years after being diagnosed.

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Colon cancer survival rates, by stage

The numbers below come from the National Cancer Institute’s SEER database, looking at people diagnosed with colon cancer between 2004 and 2010.

• The 5-year relative survival rate for people with stage I colon cancer is about 92%.
• For people with stage IIA colon cancer, the 5-year relative survival rate is about 87%. For stage IIB cancer, the survival rate is about 65%.
• The 5-year relative survival rate for stage IIIA colon cancers is about 90%. For stage IIIB cancers the survival rate is about 72%, and for stage IIIC cancers the survival rate is about 53%.
• Colon cancers that have spread to other parts of the body are often harder to treat and tend to have a poorer outlook. Metastatic, or stage IV colon cancers, have a 5-year relative survival rate of about 12%. Still, there are often many treatment options available for people with this stage of cancer.

Rectal cancer survival rates, by stage

The numbers below come from the National Cancer Institute’s SEER database, looking at people diagnosed with rectal cancer between 2004 and 2010.

• The 5-year relative survival rate for people with stage I rectal cancer is about 88%.
• For people with stage IIA rectal cancer, the 5-year relative survival rate is about 81%. For stage IIB cancer, the survival rate is about 50%.
• The 5-year relative survival rate for stage IIIA rectal cancers is about 83%. For stage IIIB cancers the survival rate is about 72%, and for stage IIIC cancers the survival rate is about 58%.
• Rectal cancers that have spread to other parts of the body are often harder to treat and tend to have a poorer outlook. Metastatic, or stage IV rectal cancers, have a 5-year relative survival rate of about 13%. Still, there are often many treatment options available for people with this stage of cancer.