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4.—(1) The following provisions apply for the purposes of establishing, pursuant to regulation 58D(6)(c), that a second medicinal product is similar to a medicinal product to which an orphan marketing authorisation relates or is safer or more effective than, or clinically superior to, that product.
(2) The following definitions apply for the purposes of this paragraph—
“clinically superior”, in relation to a medicinal product, means that it is shown to provide a significant therapeutic or diagnostic advantage over and above that provided by an authorised orphan medicinal product in one or more of the following ways—
greater efficacy;
greater safety in a substantial portion of the target population, as evidenced where appropriate through comparative clinical trials; or
in exceptional cases, where neither greater safety nor greater efficacy has been shown, a demonstration that the medicinal product otherwise makes a major contribution to diagnosis or to patient care;
“similar active substance” means an identical active substance, or an active substance with the same principal molecular structural features, but not necessarily all of the same molecular structural features, and which acts via the same mechanism, however, in the case of advanced therapy medicinal products, for which the principal molecular structural features cannot be fully defined, the similarity between two active substances is to be assessed on the basis of the biological and functional characteristics;
“similar medicinal product” means a medicinal product containing a similar active substance or substances as contained in a currently authorised orphan medicinal product, and which is intended for the same therapeutic indication.
(3) For the purposes of the definition of “clinically superior” in relation to a medicinal product which shows that superiority by means of greater efficacy, this is to be assessed by the effect on a clinically meaningful endpoint in adequate and well controlled clinical trials, representing the same kind of evidence needed to support a comparative efficacy claim for two different medicinal products.
(4) The clinical trials referred to in paragraph (3) should be direct comparative clinical trials, unless comparisons based on other endpoints, including surrogate endpoints, can be justified.
(5) Paragraphs 5 to 8 make further provision about the definition of “similar active substance” in relation to certain types of product.]
Textual Amendments
F1Sch. 9A inserted (31.12.2020) by The Human Medicines (Amendment etc.) (EU Exit) Regulations 2019 (S.I. 2019/775), reg. 1, Sch. 4 (as amended by S.I. 2020/1488, reg. 1, Sch. 2 para. 191); 2020 c. 1, Sch. 5 para. 1(1)
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