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ABPI Guidelines for Phase 1 Clinical Trials (PDF

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services - such as departments of radiopharmacy and<br />

medical physics - that support them. Other staff<br />

should be suitably qualified and experienced. There<br />

must be a Radiation Protection Supervisor whose work<br />

must be supervised by the area Radiation Protection<br />

Adviser. <strong>Trials</strong> of radioactive substances usually need<br />

the collaboration of several groups of experienced<br />

researchers.<br />

Trial subjects<br />

When selecting healthy subjects <strong>for</strong> trials of radioactive<br />

substances, 71 the investigator should:<br />

• study subjects over 50 years old, unless younger<br />

subjects can be justified;<br />

• study as few subjects as possible;<br />

• exclude women capable of having a child;<br />

• not expose subjects to more radiation than<br />

necessary;<br />

• exclude subjects exposed to radiation during their<br />

work;<br />

• exclude classified radiation workers; and<br />

• exclude subjects who have received more than 10<br />

milliSievert of radioactivity in the past 12 months.<br />

18. Non-investigational medicinal products<br />

Non-investigational medicinal products (non-IMPs) are<br />

often used during phase 1 trials:<br />

• to induce a physiological or pharmacological<br />

response to assess the activities of an IMP (in<br />

which case they are often called challenge<br />

agents); or<br />

• as support or escape medication <strong>for</strong> preventative,<br />

diagnostic or therapeutic reasons.<br />

Under these circumstances, they do not fall within the<br />

definition of an IMP. 19 So, investigators who prepare<br />

them do not need an MIA (IMP). Nor does a trial of a<br />

non-IMP by itself require a CTA. Some examples of<br />

non-IMPs or challenge agents are:<br />

• agonists, such as epinephrine, norepinephrine<br />

and isoprenaline, to test <strong>for</strong> selectivity and<br />

potency of an IMP with adrenoceptor antagonist<br />

activity;<br />

• diagnostic agents, such as allergen extracts, to<br />

diagnose allergic disease and to test the activity of<br />

anti-allergy IMPs;<br />

• cytochrome P450 probes 77-79 to assess the<br />

potential of an IMP <strong>for</strong> interaction with<br />

established medicines; and<br />

© Association of the British Pharmaceutical Industry 2007<br />

• ligands labelled with radioactive isotopes, such as<br />

11 C or 18 F <strong>for</strong> PET scans, and 99m Tc or 123 I <strong>for</strong><br />

SPECT scans (Section 17).<br />

Appendix 3 lists some of the challenge agents that are<br />

used in phase 1 trials. More details will be put on the<br />

MHRA website (Section 31). Either the sponsor or<br />

investigator may supply a challenge agent, which must:<br />

• be used in accordance with the protocol and the<br />

CTA; and<br />

• be of appropriate quality <strong>for</strong> the purposes of<br />

the trial.<br />

A qualified person (QP; Section 19) should be involved<br />

in the preparation of a challenge agent, and should<br />

keep a file of all the documents used. When deciding<br />

if a challenge agent is of the right quality, the QP<br />

should take into account:<br />

• the source, purity and stability of the materials,<br />

and whether or not they have a marketing<br />

authorisation or have been repackaged;<br />

• the shipping and storage conditions;<br />

• the dose and route of administration;<br />

• the facilities, equipment and staff; and<br />

• any other relevant factors.<br />

For radiolabelled ligands with a short half-life, such as<br />

ligands <strong>for</strong> PET or SPECT scans, the QP should<br />

consider specific radioactivity and radiochemical<br />

purity when assessing quality. Also, it may be more<br />

appropriate to assess the quality of a precursor or<br />

'cold' compound, rather than that of the radiolabelled<br />

ligand itself.<br />

19. Qualified Person<br />

Requirements<br />

Units with a pharmacy that manufactures, assembles<br />

or imports IMPs, including placebo and other<br />

comparators, must have an MIA (IMP) on which a<br />

qualified person (QP) must be named. A QP is<br />

someone who meets the permanent provisions of<br />

Directive 2001/83/EC 80 or is someone who met the<br />

eligibility criteria during the transitional period 7 after<br />

implementation of the <strong>Clinical</strong> <strong>Trials</strong> Directive. People<br />

who achieved QP status during the transitional period<br />

should make sure that their job description accurately<br />

reflects the duties of a QP 80 and that they keep up to<br />

date with GMP.<br />

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