It is probably safe but, I would always defer to my medical team on this one. I know others with different types pf cancers and procedure where some are delayed getting the shot while some are told to go ahead.
DX 5/6/2008 TAG3 papillary tumor .5 CM in size. 2 TURBS followed by 6 instillations of BCG weekly with a second round of 6 after a 6 week wait.
I took an appointment with oncologist first time during these months, as our case was handled mainly by our Uro. Oncologist stressed on giving a jab as first priority and suggested its safe and we can go ahead.
Also I talked to our Uro and he also suggested to go with vaccination. Seems like we will have to go with it sooner or later.