Setting: Retrospective review of patients with pulmonary Mycobacterium avium complex (MAC) disease treated with clarithromycin.
Objectives: To investigate whether the short-term response to treatment predicts long-term outcomes, and to analyse what explanatory variables are associated with the efficacy and outcome of treatment.
Design: Sputum conversion rates in short- and long-term outcomes were evaluated for 111 patients. Respectively 9 and 10 explanatory variables were analysed for their association with both response and outcomes.
Results: Eighty-four patients (75.7%) showed good short-term response and 94 (82.0%) showed good long-term outcomes. Women and patients with satisfactory nutrition status showed good short-term response. Patients with small lesions and those treated for >12 months after sputum conversion showed good long-term outcomes. Patients who showed good short-term response, in the group with large lesions, showed significantly good long-term outcomes (P = 0.0382).
Conclusion: There were differences between prognostic factors reflecting short-term response and long-term outcomes. The short-term response predicts long-term outcomes in certain groups divided by prognostic factor. To establish standard treatment for pulmonary MAC disease, it is important to determine a standardised method of evaluation of treatment taking such factors into consideration.