From my experience, these choices are based on your diagnosis. For me, I was only to get the "Red Devil" every 3 weeks. But, I had my genetic test back, which gave me two others. I had Brca2 and received Carboplatin and Taxol. I got the Adriamycin (Red devil), only one dose following my 12 weeks of the other two. I had a blood reaction called Pancytopenia and did not get the final 3.
I had DCIS, Stage 2 with Brca2. At Surgery time it was noted no lymph node involvement in the 3 sentinels.
It seems your 3 might be the protocol for the lymph node involvement.
You will get more responses, but this is mine.
Keep us posted.