RESUMO
Background: The 1983 US Orphan Drug Act provided impetus for the development of new therapies for rare diseases. Several studies focused on the number of orphan designations over time. However, very few focused on clinical trials that lead to their approval, particularly for infectious diseases. Materials and Methods: All new drug approvals (orphan and non-orphan) by the US Food and Drug Administration (FDA) from January 2010 to December 31, 2020, were identified and details of approvals were taken from the US-FDA labels and summary reports for each drug. The pivotal trials for each were characterized based on their design. We tested the association of the type of drug approval with respect to the characteristics of trial using Chi-square test and generated crude odds ratios with 95% confidence intervals. Results: From the total 1122 drugs approved, 84 were for infectious diseases, of which 18 were orphan drugs and 66 were nonorphan. A total of 35 pivotal trials supported 18 orphan drug approvals, while 115 pivotal trials supported 66 nonorphan drugs. The median number of participants enrolled/trial for orphan drugs was 89, while for nonorphan drugs, it was 452 (P < 0.0001). Blinding was done for 13/35 (37%) orphan drugs versus 69/115 (60%) nonorphan drugs (P = 0.029); randomization was done for 15/35 (42%) orphan drugs versus 100/115 (87%) nonorphan drugs (P < 0.0001) and 20/35 (57%) of the orphan drugs got approval in phase II versus 8/115 (6%) of nonorphan drugs (P < 0.00001). Conclusion: A significant number of orphan drugs get approval based on early phase, nonrandomized, and unblinded with a smaller sample size as compared to nonorphan drugs.
RESUMO
Background In May 2020, WHO recognized the role of extensive immunization for interrupting the transmission of the SARS-CoV-2 virus. The development of such vaccines in clinical trials relies upon participants who are expected to be vested in the research process. Assessment of participant factors such as motivation and satisfaction are hence important to gauge perspective and ensure successful conduct and completion of these trials. Methods We administered a validated three-domain questionnaire to and documented the binary categorical responses (yes/no) of participants (after informed consent) who had taken both doses of COVOVAX™ in a phase 3 trial at our institute. Association of the dependent variables (participant responses) with the independent variables (participant demographics and socioeconomic strata) was computed using Chi-square test at 5% significance. In case of a significant association, Bonferroni post-hoc test was applied for multiple comparisons. Results Of the 78 participants who were administered the questionnaire, two-thirds were highly satisfied with their experience at our site. Gaining access to a new vaccine was a primary motivation overall (74%) and also in graduates (p=0.03) and middle-class population (p=0.002), whereas the lower-middle class population (p<0.0001) and those educated till secondary school (p=0.003) took part due to the long wait for government-approved vaccines. Conclusion Participants in a Covid-19 vaccine trial at Mumbai were largely satisfied with the care given to them though altruism did not feature as a primary reason for participation.
