This study is for people with advanced cancer for which no curative treatment exists.

The purpose of this study is to test the safety and effectiveness of the combination of the drugs Temsirolimus and Capecitabine and see what effects it has on cancer.

Temsirolimus is a drug that is given by vein that targets a protein important for the growth of cancer cells known as mTOR. By inhibiting this protein, Temsirolimus can inhibit cancer cell growth and even lead to their death.

Capecitabine is a more traditional chemotherapy. It is an oral pill that gets converted in the body to the very common chemotherapy known as 5-fluorouracil.

This research is being done because it is not known if the combination of Temsirolimus and Capecitabine will work better than Capecitabine or Temsirolimus alone.

This is a Phase I study designed to assess the safety and clinical activity of temsirolimus in combination with capecitabine in patients with advanced malignancies. Because the toxicities of capecitabine are well established, and based on a previous clinical trial of temsirolimus and continuous infusion 5-fluorouracil, an alternating dose escalation plan will be employed.

The first stage of the study will be performed to identify the maximally tolerated dose of the combination, when capecitabine is given on a every 2 week schedule. The starting dose of temsirolimus will be 15-mg IV on day 1 and 8 plus capecitabine 1000 mg/m2 by mouth twice a day on days 1-7 of a 14 day schedule. Patients will be enrolled in a standard 3+3 dose escalating fashion to a maximum dose of temsirolimus of 25-mg and a maximum dose of capecitabine of 1750 mg/m2 twice a day.

If the maximally tolerated dose is determined for the every 2 week schedule, then in the second stage of the study a similar dose escalation plan will be employed for an every 3 week schedule.

Inclusion Criteria:

• Histologically proven adenocarcinoma with measurable or evaluable disease
• Disease for which capecitabine is approved or compendia listed
• Advanced unresectable, and/or metastatic disease for which there is no known curative therapy
• Performance status 0-2
• Adequate hepatic, bone marrow, and renal function

Exclusion Criteria:

• Brain metastases not under control for at least 3 months
• Active severe infection or known chronic infection with HIV, hepatitis B virus, or hepatitis C virus
• Cardiovascular disease problems including unstable angina, therapy for life-threatening ventricular arrhythmia, or myocardial infarction, stroke, or congestive heart failure within the last 6 months
• Life-threatening visceral disease or other severe concurrent disease
• Women who are pregnant or breastfeeding
• Anticipated patient survival under 3 months