SA coroner to rule on chemo inquest

South Australia's deputy coroner is to rule on whether his inquest can continue into the deaths of four cancer patients underdosed with chemotherapy.

Since mid-2016 Anthony Schapel has been looking into the deaths of leukaemia patients Christopher McRae, Bronte Higham, Carol Bairnsfather and Johanna Pinxteren.

All four were among 10 patients who were underdosed during their chemotherapy treatment at the Royal Adelaide Hospital or the Flinders Medical Centre between July 2014 and January 2015.

Some doctors involved in the inquiry have asked for it to be stopped, questioning if Mr Schapel has the necessary jurisdiction to conduct an inquest.

The state government has called for the investigation to continue, and the matter is listed for a hearing on Friday when the deputy coroner is expected to deliver his decision.