I don't know if anyone is familiar with talc being a carcinogen? I read today that talc is closely related to the potent carcinogen asbestos. Read your products that you use and on your babies. You can research this online too. God bless.
While it's not directly related to cancer (yet), there are other concerns like inhaling the tiny particles. Plus, it seems that lately ointments have taken over from powder as a way to prevent chafing.
Cornstarch is a great alternative since the particles are bigger.
From all that I've read, the real problem is the inhalation factor.