Very limited off-label prescribing was found in oncology practice in India. Since off-label use offers several advantages, judicious use of this practice should be encouraged among the oncologists.

Treatment of cancer is limited by affordability of patients in the many developing countries including India. Generic drug manufacturers have responded to this scenario by making drugs available at affordable costs, often at less than 10% the cost of the original brand. In our practice, it is found that there is a three-fold higher prescription of generic brands compared to innovator, accompanied by cost savings of up to 80% per prescription. Unfortunately, the regulatory environment prevailing in India is not geared to ensure satisfactory quality of generic products. The standards set by the regulatory agencies for establishing equivalence of generics vis-ΰ-vis the innovator product allow anticancer generics to enter markets without undergoing clinical evaluation. Many drug manufacturing units in India flout good manufacturing practice norms, which was evident during the center for drug evaluation and research classifications inspection in the year 2006. Inferior drugs have therefore, made their way into the Indian markets, compromising the quality of care. The system of drug manufacturing and marketing approval needs a major overhaul, including regular inspection of manufacturing facilities. Bioequivalence should be made mandatory for all oral formulations. Unless these measures are rigidly implemented, the benefits of generic substitution would be seriously undermined.

Imatinib is the current gold standard for treatment of chronic myeloid leukemia (CML). Recent pharmacokinetic studies have shown considerable variability in trough concentrations of imatinib due to variations in its metabolism, poor compliance, or drug-drug interactions and highlighted its impact on clinical response. A trough level close to 1000 ng/mL, appears to be correlated with better cytogenetic and molecular responses. Therapeutic Drug Monitoring (TDM) for imatinib may provide useful added information on efficacy, safety and compliance than clinical assessment alone and help in clinical decision making. It may be particularly helpful in patients with suboptimal response to treatment or treatment failure, severe or rare adverse events, possible drug interactions, or suspected nonadherence. Further prospective studies are needed to confirm relationship between imatinib plasma concentrations with response, and to define effective plasma concentrations in different patient populations.