A rare type of cancer linked to breast implants is much more common than previously thought, Australian health authorities say.

The country’s Therapeutic Goods Administration (TGA) said as many as one in 1000 Australian women who got breast implants would develop Anaplastic Large Cell Lymphoma (ALCL).

Health authorities and surgeons had believed the risk was somewhere between one in three million and one in 50,000.

The TGA now estimated the risk ranged between one in 10,000 and one in 1000.

Forty-six cases have been diagnosed in Australia and New Zealand.

But health authorities do not recommend removing implants as a preventative measure.

Instead, women should monitor their breasts for any changes and consult their surgeon if they have concerns.