Diagnosing cancer in general practice: from suspicion to certainty

Area of Science:

• Oncology
• General Practice
• Diagnostic Accuracy

Background:

• General practitioners (GPs) frequently encounter patients with suspected cancer.
• Accurate early detection of cancer is crucial for patient outcomes.
• The diagnostic value of GP suspicion and patient-reported factors requires further investigation.

Purpose of the Study:

• To evaluate the accuracy of cancer suspicion by general practitioners.
• To identify predictors of malignancy in patients suspected of having cancer.
• To compare cancer incidence in suspected versus unsuspected patient cohorts.

Main Methods:

• A prospective follow-up study of 382 patients with suspected cancer and a control group of 7014 unsuspected patients.
• Data collection included GP's assessment of suspicion strength, patient symptoms, and fear of cancer.
• Outcomes were tracked for up to two years to confirm or reject cancer diagnosis.

Main Results:

• Less than 10% of GP suspicions for cancer were confirmed.
• The GP's strength of suspicion was the strongest predictor of a cancer diagnosis.
• Patient's fear of cancer and consultation for non-symptomatic reasons were significant predictors.
• No single symptom, including palpable lumps (2.5% predictive value), strongly predicted cancer.
• Cancer incidence in the unsuspected group mirrored the general population rate.

Conclusions:

• GP suspicion of cancer has a low positive predictive value.
• Patient-reported fear of cancer and non-symptomatic consultations are important indicators.
• Diagnostic strategies should consider patient psychological factors and non-specific presentations alongside clinical assessment.