Tobacco Industry Claim Sparks New Passive Smoking Row.
The report found "considerable variation" in the way Scottish hospitals had implemented 1995 guidelines for treating the disease and said nine hospital trusts had not put one particular guideline into practice.
Politicians denounced the "scandalous situation" and demanded a Scottish Office inquiry.
"The hospitals which are failing to implement national guidelines should be named", said the SNP's health spokeswoman Kay Ullrich.
"Women are entitled to know that their hospital is going to give them the best treatment possible."
A Scottish Office spokesman said cancer was a priority area for the NHS in Scotland and the Government was keen to ensure sufferers got the best treatment.