Cancer Staging Explained: What Does Each Stage Mean?
                     Dr. Seema Singh
Surgical 
Oncologist
Dr. Seema Singh is an accomplished 
Surgical Oncologist with an experience 
of over 18 years. Currently Dr. Seema is 
working as Principal Consultant Onco 
and Onco Surgery at Max Super 
Speciality Hospital, Vaishali, W-3, Sector-
1, Ghaziabad-201012, Uttar Pradesh. 
CANCER
STAGING
EXPLAINED
What Does Each Stage Mean ?
What 
ICsancer 
Staging?
Cancer staging describes how much 
cancer is present and where it has 
spread.
It helps doctors understand 
the extent of disease.
Staging may involve physical 
examination, imaging, biopsies, 
blood tests, and other 
investigations.
The stage helps guide treatment 
planning and gives an idea about 
diagnosis.
Understanding the
TNM System T N M
Most solid cancers are 
described using the TNM 
staging system:
T 
T (STizuem aondu re)x:tent of the primary 
tumour.
N T (Tumour) N (Nodes) M 
N W(Nhoedtehse)r: nearby lymph nodes (Metastasis)contain cancer cells. Size and Whether Whether cancer 
extent of the nearby lymph has spread to 
M primary nodes contain distant organs.
M (WMheettahsetra csaisn)c:er has tumour. cancer cells.
spread to distant organs.
The combination of T, N, and M findings helps determine the overall 
stage.
Stage 0:
Very Early 
Cancer
Stage 0 is often 
called
carcinoma in situ.
Abnormal or cancerous cells are 
present but have not invaded nearby 
tissues.
It is considered 
a
very early 
Dsteapgeen.ding on the cancer type, treatment 
may involve surgery or other local 
treatments.
Early diagnosis can allow 
treatment before invasive cancer 
develops.
Stages I & 
ILIo:calised Cancer
Stag Stage 
e I II
Cancer is generally The tumour may be 
smaller and larger or may have 
limited to its grown further into 
original site. nearby tissue.
It has not In some cancers, 
significantly spread nearby lymph 
to nearby structures. nodes may be 
involved.
Treatment can include surgery, chemotherapy, 
radiation therapy, targeted therapy, or 
combinations, depending on the cancer type.
Slide 
5
Stages III & 
IMVo:re Advanced Cancer
Stage Stage 
III IV
Cancer has Cancer has 
usually spread spread to distant 
more parts of the body 
extensively into and is called 
nearby tissues or metastatic 
lymph nodes. cancer.
Treatment at advanced stages focuses on controlling cancer, 
reducing symptoms, maintaining quality of life, and extending 
survival. Treatment plans are personalised according to cancer 
type, stage, overall health, and tumour characteristics.
Why Knowing 
tShteage 
MaHtelptse dorctosrs select the most
appropriate treatment 
approach.
Helps estimate prognosis and
expected disease behaviour.
Helps determine whether surgery,
systemic treatment, radiation, 
or a
combination may be appropriate.
Allows doctors to monitor
response to treatment.
Cancer stage is not the same for
every cancer, so staging criteria
can vary by cancer type.
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