Maintainance Dose?

hi i got a friend whose mother has been taking Tarceva. She has been enrolled on that trial. There was a substantial decrease in tumor size. Her Care provider didnt gave her much of an anwser when she ask after the trial if she can continue the drug? or is there a maintainance dose for it and how long will it be?other labs to monitor?please reply

. I had stage IV lung cancer with a pleural effusion. It was inoperable and they could not use radiation. I am now cancer free. I had Carboplatin, Taxol; and Tarceva100mg all at the same time. I continue to take Tarceva100mg. I have been taking it for over a year and they are not sure how long I will continue to take it. They tell me because I have no side effects, why not take it?
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