Roll Call for Herceptin Only - No Chemo

Hello - I am taking Herceptin Only - NO CHEMO - and would like to know from some others taking Herceptin only, how long they think they feel the effects (pain at tumor sites). I was taking it every 3 weeks, but weekly seems to be working much better. Would you please reply on the net or send me e-mail personally? Luv and Hugs, PJ - am trying to decide if I need to add Chemo.