Jen,
My husband Chris was diagnosed 8/04 with Ext. SCLC w/ 4 brain mets. Had 35+ WBR, chemo, lung radiation. All gone. 6 weeks later, 24 brain mets, cloudy lung. Topotecan started. After 2 sets of Topo, innumerable brain mets. No mets anywhere else. Passed away April 26th, 2005. His course was much different than yours. His Onc. has said that Topo works very well on some people. I pray with all my heart it works for you.
Lori