Sequential Instruction: When to Pair GP and Specialist Evidence in Delayed Cancer Diagnosis

The Role of the GP Expert in Initial Assessment

In clinical negligence litigation involving allegations of delayed cancer diagnosis, the strategic sequencing of expert evidence is a significant component of case management. Properly timed instruction of a General Practitioner (GP) expert alongside a relevant medical consultant can assist the court in evaluating the patient pathway, bridging the gap between primary care presentation and secondary care diagnostic thresholds.

The initial instruction frequently focuses on the GP expert to address the standard of care during the primary care consultation. The expert’s role involves determining whether the patient’s presentation triggered a requirement for investigation or referral under applicable clinical guidelines. A GP expert evaluates whether the clinical records reflect the recognition of symptoms, whether safety-netting was appropriate, and whether the decision-making process met the Bolam standard, as clarified by Bolitho v City and Hackney Health Authority [1998] AC 232.

Where the case involves complex primary care navigation, instructing a GP expert early in the lifecycle of the claim allows for a thorough analysis of alleged diagnostic delays and missed opportunities for triage. This foundational evidence informs the instructing solicitor’s assessment of merits and establishes the framework before the specialist consultant addresses the subsequent impact on prognosis.

Aligning GP and Consultant Evidence

Once the breach of duty is evaluated, the focus may shift to causation. This requires a consultant with the appropriate subspecialty, such as oncology, gastroenterology, or general surgery, to address whether the alleged failure to refer made a material contribution to the patient’s outcome. The sequential instruction approach may avoid premature expense; there is often limited utility in commissioning extensive oncology reporting if the primary care evidence cannot sustain the allegation of a negligent delay.

By ensuring that the GP expert and the oncology consultant share an understanding of the evidence base, solicitors can build a linear argument. This synergy is particularly relevant in cases where comorbidities complicate the prognosis. When a case spans multiple specialties—for instance, where an initial GP delay is compounded by a secondary care diagnostic error—the instructing solicitor should consider the benefit of a multi-disciplinary approach to establishing the ‘but-for’ test.

Procedural Framework and Expert Cooperation

CPR Part 35 governs the role of the expert, who holds a primary duty to the court under CPR 35.3. Solicitors should note the distinction between individual party experts and a single joint expert. Under CPR 35.7, the court may direct that evidence be given by a single joint expert, in which case the parties must follow the provisions of CPR 35.8 regarding the instruction of that expert. Unlike experts instructed by separate parties, a single joint expert does not engage in the joint statement process described in CPR 35.12, as they are the sole source of evidence on that issue.

Where separate experts are instructed, CPR 35.12 allows for discussions and the production of a joint statement, which should remain focused on the central clinical disputes. Experts have the right under CPR 35.14 to ask the court for directions, which can be useful when experts identify significant discrepancies in the interpretation of chronological evidence.

Practical Considerations for Solicitors

• Screening Phase: Prioritise the GP expert to confirm whether the alleged index event represented a deviation from acceptable practice before proceeding to specialist causation analysis.
• Causation Phase: Engage the subspecialist consultant once the GP’s findings are evaluated, ensuring the specialist report addresses the impact of the timeline on clinical outcome.
• Records Management: Ensure the bundle provided to each expert is identical, containing the relevant GP notes, hospital records, and imaging reports, to prevent discrepancies in the interpretation of the chronology.
• Proportionality: Assess whether a single joint expert, as directed by the court under CPR 35.7, is appropriate for specific technical issues to minimise costs, particularly where the clinical questions are narrow.

By treating the instruction of GP and specialist evidence as a sequential strategy, solicitors can build more robust cases that withstand scrutiny. Selecting an expert team that communicates effectively across these disciplines is a consistent method to address the complexities of clinical causation and ensure that both primary and secondary care components are evaluated with appropriate seniority.