First line treatment definitions

First-line treatment

The preferred therapy for a particular condition (e.g., trimethoprim-sulfamethoxazole (TMP-SMX) is the first-line treatment for PCP).
Found on http://www.virology.net/ATVGlossary.html

---

First line treatment

This is the first course of treatment you have when diagnosed with cancer or after the cancer has come back (recurred).
Found on https://www.encyclo.co.uk/local/20753

---