Qualitative research for the study of cancer and age.

Qualitiative research emphasizes identification, illumination, and understanding of phenomena, the meaning and theory behind which are unpresumed by the investigator. Although quantitative techniques are used to test predetermined hypotheses, qualitative techniques are used to generate hypotheses. Qualitative techniques have only begun to be used in medical research in the past decade but are especially useful in exploring content areas about which little is known and in eliciting and understanding the patient's perspective. Despite the aging of the United States population, the cancer illness experience has not been well studied in older patients. Because communication preferences, treatment decision-making styles, psychosocial issues, and the illness experience itself may be significantly different for older persons diagnosed with cancer than for younger persons, qualitative research techniques can be used to identify those differences critical to the effective health care of this burgeoning population.