Cancer Clinical Trials: Phases, Process & Patient Considerations

Clinical trials are structured research studies testing new cancer interventions. They follow rigorous phases:

Trial Phases

Phase	Goal	Participants
I	Safety, MTD, pharmacokinetics	20–80 (often advanced cancer)
II	Efficacy signal, side effects	100–300
III	Compare vs. standard of care	300–3,000+ (randomized)
IV	Post-marketing surveillance	Large populations

Key Process Steps

1. Protocol development & IRB approval (ethics, scientific validity).
2. Informed consent: Risks, benefits, alternatives, right to withdraw.
3. Screening & enrollment: Strict eligibility criteria.
4. Treatment & monitoring: Per protocol; safety reporting (SAEs).
5. Data analysis & publication: Intent-to-treat, statistical rigor.
6. Regulatory review: FDA/EMA approval if Phase III positive.

Patient Considerations

• Potential benefits: Access to novel therapy, close monitoring, altruism.
• Risks: Unknown toxicity, placebo chance (Phase III), extra visits/procedures.
• Questions to ask: Phase, randomization, standard care alternative, costs, biopsy requirements.

Resources: ClinicalTrials.gov, NCI Cancer Information Service (1-800-4-CANCER).