The anti neoplastic drugs can be a handful. I think the highest yield info for them is to know which ones are cycle specific and if so at what point. I also think the side effects and treatments for the toxic effects are very high yield.
For example
-MENSA for hemorrhagic cystitis induced by cyclophosphamide
-leucovorin for methotrexate, thymidine for 5-FU
-Filgrastim/Sargramostim for myelosupression
-Allopurinol if you develop Tumor lysis syndrome.
To get back to your original question...I think the most important cancers that you should know how to treat are the following:
-Prostate Cancer: Flutamide, Leuprolide..maybe others im not sure
-Breast Cancer: estrogen sensitive=tamoxifen. erb-b2 expressor=traztuzumab also Paplitaxel and Anostrazole are used for breast cancer
-Testicular Cancer: Etopside, Bleomycin, Cisplatin
-Imatinib for CML-makes sense since its a tyrosine kinase inhibitor
-Rituximab for Follicular lymphoma (targets cd20 to kill b cells. PS this is not in first aid)
-The "mustines" for brain tumors-makes sense because they cross the BBB -Dactinomycin for childhood tumors
Definitely know the 2 treatment regimens for Hodgkins
-ABVD (Adriamycin, bleomycin, vinblastine, dacarbazine)
-MOPP (Mechlorethamine, Oncovin aka Vincristine, Procarbazine, Prednisone)