His research aims to improve diagnosis for patients with non-specific or vague symptoms of cancer. In particular investigating weight loss as a feature of cancer in GP patients (NIHR - LOWCAN), novel multidisciplinary models of care (ACE - SCAN), and the role of safety-netting in preventing missed opportunities for diagnosis (CRUK - CASNET/CASNET2).

He evaluates how GPs can safely use tests to diagnose primary and recurrent cancer, including circulating DNA, Carcinoembryonic Antigen (CEA), Faecal Immunochemical Testing (FIT), and Cancer Antigen 125 (CA125). He collaborates with secondary care colleagues about myeloma, testicular cancer, colorectal cancer, and ovarian cancer.