follow up from 7/10

following up on my july 10th question and your response. initially they were not monitoring the CA125 because the diagnosis was lung cancer with an unknown primary. in january before her first session of carboplatin/taxol her CA125 was 200 and her 27-29 was 146. the 27-29 kept going down steadily until it was down to 20 in may. at that time we went to the gynocoloical oncologist who felt the primary was ovarian, based on the pathology and the full response my wife had to the tratments. her CA125 was down to 18 two weeks before the hysterectomy. after the hysterectomy and approx 2 months since her last treatment and 2 weeks after the hysterectomy her CA125  went up to 28. her 27-29 went from 34 prior to the hysterectomy to ironically 28 just before beginning the 12-24 smaller taxol treaments. after completing the first three smaller weekly taxol treatments her CA125 went down to 12. what is the basis for deciding the right amount of treatment cycles 12 or 24 etc. my wife feels that the taxol is the only thing that is keeping her alive, her doctor says her prognosis is very encouraging based on her response in combination with the findings being microscopic residual tumors. please let me know your oppinion from the facts above and the posting i left on 7/10