It represents the commitment of governments to close-to-home treatment and persistent advocacy of regional residents.

The "concrete structure" for the two-storey and $35 million Western Cancer Centre on the grounds of Dubbo Hospital is reported to be almost complete.

The first pour was at the ground-floor radiation bunker in late June.

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Its walls are about 2.3 metres thick in order to encapsulate a linear accelerator, a machine which will administer radiotherapy.

The concreting phase of the multi-million-dollar project followed the demolition from February of the hospital's old renal unit.

Lipman is building the cancer centre near the new Macquarie Building.

Hansen Yuncken is constructing the three-storey Macquarie Building under the hospital's $150 million stage three and four redevelopment.

Construction of the almost 2900-square-metre cancer centre is being funded with $25 million from the federal government and $10 million from the state government, which will also pay for its running costs.

This week Health Infrastructure, which oversees the planning, design, procurement and construction of health capital works in NSW, provided a brief update on the project.

"Good progress has been made on the construction of the $35 million Western Cancer Centre, with the concrete structure scheduled for completion in the coming weeks," its spokeswoman said.

"Works will then focus on the completion of the building facade and the installation of the internal services, walls, ceilings and floors.

"Construction is on track for completion in mid-2021."

Level one of the cancer centre will be linked to the Macquarie Building, where a new emergency department and imaging unit are already operational.

The cancer centre will also have 16 chemotherapy spaces and a PET diagnostic scanner, the only one west of the Blue Mountains.

A wellness space will accommodate support services for patients, carers and families.

Lipman's brief also includes "master planning for a second bunker to future proof the facility".