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[Chrono-chemotherapy and dose intensity]

F Lévi¹

¹Laboratoire Rythmes biologiques et chronothérapeutique, hôpital Paul-Brousse, Villejuif, France.

Bulletin Du Cancer

|January 1, 1995

Summary

Cancer chronotherapy, adapting chemotherapy to circadian rhythms, improves drug delivery and patient outcomes. This timed approach enhances chemotherapy dose intensity and response rates, particularly for metastatic colorectal cancer.

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Area of Science:

Oncology
Pharmacology
Chronobiology

Background:

Circadian rhythms significantly influence cellular metabolism and proliferation.
Chemotherapy toxicity and efficacy vary by over 50% based on administration timing in preclinical models.
These findings prompted the investigation of chronotherapy in cancer treatment.

Purpose of the Study:

To evaluate the safety and efficacy of chronotherapy in cancer patients.
To determine the maximal tolerated dose and optimal scheduling for chronotherapy.
To assess the impact of chronotherapy on chemotherapy dose intensity and patient response rates.

Main Methods:

Utilized programmable-in-time pumps for precise chemotherapy delivery.
Conducted randomized clinical trials to compare chronotherapy schedules with conventional methods.
Employed a non-randomized trial for cytokine (interferon alpha) delivery assessment.
Performed subsequent phase II trials for dose escalation in metastatic colorectal cancer.

Main Results:

Chronotherapy increased chemotherapy dose intensity by 13-45% compared to conventional timing.
Chronotherapy demonstrated applicability to cytokine delivery.
Increased 5-fluorouracil (5-FU) dose intensity in chronotherapy correlated with a 20% higher response rate in metastatic colorectal cancer patients.
Intrapatient dose escalation in chronotherapy showed a positive correlation between 5-FU dose intensity and treatment response.

Conclusions:

Chronotherapy is a viable approach to enhance chemotherapy efficacy and reduce toxicity.
Timed drug delivery can significantly improve treatment outcomes and patient quality of life.
Future anticancer drugs could benefit from chronotherapy for improved safety and ambulatory administration.

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