There's assurances from the Health Minister that he'll deliver on the promised cancer drug funding this term.

The Government had pledged to put $280 million towards funding 13 life saving cancer treatments under Pharmac.

But they didn't make the cut on Thursday's Budget, with Finance Minister Nicola Willis saying it hadn't been possible.

Health Minister Shane Reti says he's sorry about the uncertainty it is causing cancer patients and their families.

"We will fund those cancer drugs, and we'll be making more announcements soon on that. But we'll absolutely maintain our commitment to those people - who saw that expectation and what we campaigned on."

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