The chief executive of health watchdog Nice told ITV News he is "disappointed" that drug manufacturer Roche has not offered the NHS a discount on a breast cancer drug that costs around £90,000 per patient.
Kadcyla, which extends women's lives by almost six months, could be blocked from routine NHS access because it is too expensive.
"Companies can discount their prices and they frequently do. Given the list price. I would have expected the company to have at least considered (a discount)," Andrew Dillon said.
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Fears have been raised about the safety of the structure after the blaze last Friday night.
The Home Office said the two Labour MPs signed up for alerts intended for EU citizens.
The comments are the latest twist in the row between the US and EU countries including Britain over trade tariffs.