Is weekly Cisplatin considered a valid alternative to Cisplatin cycles every 3 weeks as part of definitive chemo-radiation for muscle invasive bladder cancer?

None of the RTOG trials had this approach, but extrapolating from head and neck cancer (cisplatin 30mg/m2) or cervical cancer (40mg/m2), people in the community are using weekly cisplatin. As far as data, there is a phase II study from Australia utilizing cisplatin 35mg/m2 weekly for 6-7 cycles show...