ANTINEOPLASTIC CHEMOTHERAPY OF THE OLDER CANCER PATIENT

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The management of the older cancer patient with cytotoxic chemotherapy requires knowledge of the pharmacologic effects of age and awareness of the diversity of the older population.5, 6 Aging may influence several aspects of pharmacology. A progressive restriction in the functional reserve of multiple-organ systems29 may alter the pharmacokinetics of antineoplastic agents and increase the susceptibility of older individuals to the complications of treatment.4, 6, 21, 23, 29, 47, 89 Cellular senescence may curtail the ability of normal tissues to repair the molecular damage caused by the drug. Older individuals may develop tumors that are more resistant to cytotoxic treatment.15, 24, 31, 64, 84

The diversity of the older population reflects the multidimensional nature of aging that mandates individualized treatment plans.5, 6, 45 To formulate and implement these plans, the practitioner needs to be experienced in assessing older individuals.

This article reviews the pharmacology of aging and offers practical suggestions for the use of chemotherapy for older individuals.

Section snippets

Pharmacokinetics

All pharmacokinetic parameters illustrated in Figure 1 are influenced by age. The absorption of drugs and nutrients is progressively reduced by restriction in the absorptive surface of the small bowel and in the splanchnic circulation.23, 29, 43, 58, 89 Lessened gastric motility and gastric secretion may also delay the absorption of drugs.23, 43 Traditionally, changes in absorption have had limited effects on cancer chemotherapy regimens, but they may become more relevant with the development

ASSESSMENT OF THE OLDER CANCER PATIENT

Treatment-related decisions must be tailored to the condition of the individual patient, based on the answers to the following questions:

  • 1

    Is the patient going to die with cancer or of cancer?

  • 2

    Is the patient going to suffer cancer-related morbidity during his or her lifetime?

  • 3

    Is the patient likely to tolerate the complications of treatment?

A comprehensive assessment of the older patient provides a frame of reference to answer these questions5, 6 and can direct treatment-related decisions.

PRACTICAL SUGGESTIONS FOR THE MANAGEMENT OF THE OLDER CANCER PATIENTS WITH CYTOTOXIC CHEMOTHERAPY

A number of practical guidelines and a research agenda for the future may be derived from this discussion.

Practical guidelines for the management of the older cancer patient with cytotoxic chemotherapy include

  • Pharmacologic interventions

    • 1

      Adjust initial dose of chemotherapy to the renal function of the patient; subsequent doses should be further adjusted according to the nadir counts and other toxic complications.

    • 2

      Maintain hemoglobin levels at or above 12 g/dL when possible with the

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    Address reprint requests to Lodovico Balducci, MD, H. Lee Moffitt Cancer Center, University of South Florida College of Medicine, 12902 Magnolia Drive, Tampa, FL 33612–9497

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