First Time Marker Change When Starting Herceptin

[heblaj01]

I would like to find out how soon others on this forum had indication of a decrease in markers after starting Herceptin alone(preferably) or in combination with other drugs.
In the case of a relative with HER+3 she had a decrease of about 20% of her CEA (from 129 to 103) 15 days after the first Herceptin infusion. This cannot be a temporary fluke unrelated to treatment since she had 3 previous monthly escalating CEA readings increasing at the rate of 30 points per month & Herceptin is the only prescribed anti cancer drug she is taking.

If this drop is declared by responders as very unusual I would suspect that she was helped by self prescribed supplements which might confirm laboratory experimental results.