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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