There are lots of cancers, some can be more severe than others. But overall it will always depend on when it is found. For example- cervical cancer is very curable but if a girl gets an abnormal smear and never follows it up it can be very dangerous.
In terms of worst- pancreatic cancer is quite bad- the reason for this is that it often doesn’t present (it’s not found) until later on in its stages when it may have already spread to other organs but again- like said all cancers can be pretty bad if not found earlier.
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