When teens get colorectal cancer, it’s often an aggressive form of the disease​When teens get colorectal cancer, it’s often an aggressive form of the disease 

 Only a tiny number of colorectal cancer cases occur in people younger than 21, but they’re often diagnosed at later stages and more difficult to treat.  ​​Only a tiny number of colorectal cancer cases occur in people younger than 21, but they’re often diagnosed at later stages and more difficult to treat.