My doctor wants to stop my herceptin and perjeta treatment after only 17 cycles, even though I don’t show side effects. I got PCR but am afraid that breaking from standard regimen will let cancer come back. I don’t know if I should insist on getting the 18th treatment. According to Perjeta information it should be up to 18 cycles, but doctor can stop if you have very strong side effects, which I don’t.