A latest report published on Sundays that a medicine used to cure advanced breast cancer has had what appears to be an exceptional success in extending lives in an experimental trial.

Doctors observed that patients who got the medicine Perjeta, from the Swiss drug maker Roche had a median survival time nearly 16 months longer than those in the control group.

That is the greatest quantity of time for a medicine used as an early cure for metastatic breast cancer, the investigators said, and it may be one of the best ever treatment of any cancer. Nearly all cancer medicines extend survival in patients with metastatic disease for a few months at most, metastasis means the cancer has increased in other parts of the body.

Dr. Sandra M. Swain, the lead investigator of the study said that we’ve not at all seen something like this before and it’s really exceptional to have this survival advantage.

The consequences were being demonstrated on Sunday in Madrid at the yearly meeting of the European Society for Medical Oncology and at this meeting Dr. Swain has been a paid presenter for the company.

An earlier examination of the medical trial recognized that Perjeta, known commonly as pertuzumab, enhanced survival by a statistically large amount, but until now it was not famous by how much, because patients had not been pursued long enough.

Perjeta, like the better-recognized Roche drug Herceptin, or trastuzumab, obstructs the action of a protein called HER2, which encourages the development of some breast tumors and Perjeta is designed to be used with Herceptin for the approximately 20 percent of breast cancers distinguished by an abundance of HER2.

The revolutionary drug Perjeta was approved by the FDA because it reduces the side effects normally related to cancer-fighting medicines.