Authorities said they feared Cameron may have been attacked by crocodiles after clothing and a walking stick were found near a creek known to contain a number of the animals.
He added that as the items were "located near (a) creek bank, we can not rule out the possibility of a croc attack".
"We have also located some biological matter which we believe to be human remains and these are being tested in Cairns", Acting Inspector Ed Lukin said on Thursday.
Ms Cameron's devastated family conceded they were of the "firm belief" Anne had "passed away in tragic circumstances" as they waited for DNA testing to come back.
Anne Cameron, 79, was reported missing from the Ozcare aged care facility at Port Douglas on Tuesday.
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"We continue to search that area in the hopes we do find her alive".
A MISSING elderly woman is feared to have been killed by a crocodile after cops found possible human remains and a walking stick near a croc-infested creek.
Police have not ruled out finding Cameron alive and are still searching the area.
The Ozcare home offers residential aged care, with specialist dementia care facilities.
The forensic tests should be completed by Friday morning, and police and SES are continuing to search for the missing woman.
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State Emergency Service area controller Sean McGuinness said the search is proving to be hard.
Sean McGuinness, a emergency service area controller, told the broadcaster: "The search area is relatively flat, however the environment with the mangroves and the swamp area, it is quite hard to get through that area".
"In north Queensland we face the risk and sometimes the ultimate price because governments are weak on this issue", Australian MP Robbie Katter said Thursday while urging the state government to support the proposal for stricter crocodile management.
"She's only been here eight or nine days".
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