Empagliflozin and pioglitazone do not appear to have adverse DDI (drug drug interactions), at least short term. Why is this important - because this was in healthy people.

Pharmacokinetics of Empagliflozin and Pioglitazone After Coadministration in Healthy Volunteers

Regarding bladder cancer and lack of treatment options - progress is being made:

New treatment eliminates bladder cancer in 82% of patients

CV health and pioglitazone:

Pioglitazone and cardiovascular risk. A comprehensive meta-analysis of randomized clinical trials

This is an interesting paper on genetic variability affecting pioglitazone:

Current clinical evidence on pioglitazone pharmacogenomics

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