Is capecitabine the same as 5-FU?

Fluorouracil (5-FU) remains the most widely used agent for colorectal cancer. Capecitabine is a rationally designed 5-FU pro-drug developed to mimic the continuous infusion of 5-FU while avoiding complications and inconvenience of intravenous administration.

What is the mechanism of action for chemotherapy medications like 5-FU?

5-Fluorouracil (5-FU) can activate p53 by more than one mechanism: incorporation of fluorouridine triphosphate (FUTP) into RNA, incorporation of fluorodeoxyuridine triphosphate (FdUTP) into DNA and inhibition of thymidylate synthase (TS) by fluorodeoxyuridine monophosphate (FdUMP) with resultant DNA damage.

Should capecitabine replace 5-fluorouracil in the first line treatment of metastatic colorectal cancer?

Furthermore, pharmacoeconomic data and patients’ preferences for oral chemotherapy further favor capecitabine. Therefore, capecitabine appears to be an effective and safe alternative to fluorouracil in the first-line treatment of metastatic colorectal cancer.

What is the mechanism of action for 5-FU?

In mammalian cells, 5-FU is converted to fluorodeoxyuridine monophosphate (FdUMP), which forms a stable complex with thymidylate synthase (TS), and thus inhibits deoxythymidine mono-phosphate (dTMP) production. dTMP is essential for DNA replication and repair and its depletion therefore causes cytotoxicity [9,10].

Can 5-FU be given orally?

Three oral 5-fluorouracil (5-FU) therapies have been approved by the US Food and Drug Administration or are in development for the treatment of patients with breast cancer: capecitabine, UFT, and 5-FU/eniluracil.

What should patients using 5FU expect with treatment?

5FU can cause a rash, which may be itchy. During treatment and for several months afterwards, you will be more sensitive to the sun and your skin may burn more easily than usual. You can still go out in the sun, but: use a suncream with a sun protection factor (SPF) of at least 30.

How effective is 5-fluorouracil?

Topical 5-fluorouracil (5-FU) for the treatment of widespread multiple AK lesions has cure rates of more than 90 percent. The associated skin irritation, however, may lead patients to prematurely discontinue treatment.

Does capecitabine shrink tumors?

Capecitabine is taken to shrink tumors and decrease symptoms of colon cancer. If colon cancer is early stage (limited to intestine tissue or surrounding lymph nodes), capecitabine is commonly given with the goal of cure.

What are the side effects of 5 FU?

Possible Side Effects of 5-Fluorouracil, Oxaliplatin, Trastuzumab (Table Version Date: October 8, 2013)

• Hair loss.
• Redness, pain or peeling of palms and soles.
• Rash, increased risk of sunburn, itching.
• Sores in mouth which may cause difficulty swallowing.
• Heartburn.
• Headache.
• Anemia which may require blood transfusion.

How is capecitabine a prodrug of 5-fluorouracil?

Capecitabine, a prodrug of 5-fluorouracil (5-FU), is an antimetabolite and antineoplastic agent. Following oral administration it is enzymatically converted to 5-FU, the active compound. Capecitabine is designed to increase the selectivity of 5-FU for tumor cells and to decrease plasma levels of 5-FU Blesch et al (2003).

What is the mechanism of action of capecitabine?

Mechanism of action Capecitabine, fluoropyrimidine carbamate, is a prodrug of fluorouracil. It undergoes three-step enzymatic conversion to become cytotoxic. It is first metabolized in the liver to 5-deoxy-5-fluorocytidine (5-DFCR) by carboxylesterase, then to 5-deoxy-5-fluoroudine (5-DFUR) by cytidine deaminase,…

Which is better for breast cancer 5-FU or capecitabine?

Thus, the t1/2 of capecitabine after oral administration of 1250 mg m −2 is comparable to that of 5-FU, but its ease of dosing by mouth offers an advantage to patients. Capecitabine is approved for the treatment of breast and colorectal cancer.

How long does capecitabine stay in the body?

After oral administration of 1250 mg/m2, capecitabine is rapidly and extensively absorbed from the gastrointestinal tract [with a time to reach peak concentration (tmax) of 2 hours and peak plasma drug concentration (Cmax) of 3 to 4 mg/L] and has a relatively short elimination half-life (t(1/2)) [0.55 to 0.89 h].