Date of initiation for immunotherapy (a.k.a. biological response modifier) that is part of the first course of treatment. See also RX Summ--BRM [1410]. See Data Descriptor Table for date format.

Formerly RX Date--BRM.

The dates on which different treatment modalities were started are used to evaluate whether the treatments were part of first course of therapy and to reconstruct the sequence of first-course treatment modes.

Note: CoC discontinued support of this item from 2003 through 2009.