
Circadian rhythms, the cyclic variation of body metabolism during a 24 hour day, may be able to add to chemotherapy or radiation therapy effectiveness. "The circadian timing of surgery, anticancer drugs, radiation therapy, and biologic agents can result in improved toxicity profiles, tumor control, and host survival"  See abstract below.  Pubmed search term is also included.

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Circadian chemotherapy for gynecological and genitourinary cancers.</b>
Kobayashi M, Wood PA, Hrushesky WJ.   
University of South Carolina School of Medicine, Columbia 29209, USA.

  "The circadian timing of surgery, anticancer drugs, radiation therapy, and biologic agents can result in improved toxicity profiles, tumor control, and host survival. Optimally timed cancer chemotherapy with doxorubicin or pirarubicin (06:00h) and cisplatin (18:00h) enhanced the control of advanced ovarian cancer while minimizing side effects, and increased the response rate in metastatic endometrial cancer. Therapy of metastatic bladder cancer with doxorubicin-cisplatin was made more tolerable by this same circadian approach resulting in a 57% objective response rate. This optimally timed therapy is also effective in the adjuvant setting, decreasing the expected frequency of metastasis from locally advanced bladder cancer. Circadian fluorodeoxyuridine (FUDR) continuous infusion (70% of the daily dose given between 15:00h and 21:00h) has been shown effective for metastatic renal cell  carcinoma resulting in 29% objective response and stable disease of more than 1 yr duration in the majority of patients. Toxicity is reduced markedly when FUDR infusion is modulated to circadian rhythms."

"...Biological agents such as interferon-alpha and IL-2 have shown low but effective disease control in Metastatic renal cell cancer, however, with much toxicity. Each of these cytokines shows circadian stage dependent toxicity and efficacy in model systems."

<b> "In summary, the timing of anthracycline, platinum, and fluoropyrimidine-based drug therapies during the 24 hour day is relevant to the toxic therapeutic ratio of these agents in the treatment of gynecologic and genitourinary cancers." </b>  
&&url PMID: 11962679 


Last updated October 2003