If my treatment is unsuccessful, what other options are available to treat my cancer?

I'm on the CHOP regimen for my non-hodgkins lymphoma (doxorubicin, cylcophoshamide, prednisone, and vincristine). If it's unsuccessful, what happens then? Sorry, this may be a really stupid question. I'm just curious. I've only started treatment 4 days ago. I'm 17. Thanks.