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Limited effect of summer warming on the sensitivity of colorectal cancer screening
  1. Manuel Zorzi,
  2. Susanna Baracco,
  3. Chiara Fedato
  1. Veneto Tumour Registry, Istituto Oncologico Veneto IOV IRCCS, Padua, Italy
  1. Correspondence to Manuel Zorzi, Veneto Tumour Registry, Istituto Oncologico Veneto IRCCS, Passaggio Gaudenzio 1, 35132 Padua, Italy; manuel.zorzi{at}

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In their recent paper, Grazzini and colleagues1 reported a decrease in the positivity of the immunochemical faecal occult blood test (iFOBT) for colorectal cancer screening during the summer period. Their results predict a higher rate of false-negative iFOBT results during the hot season. This effect is likely to be higher for patients with minor neoplastic lesions, where the haemoglobin concentration in faeces is usually lower2 than in patients with …

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  • Competing interests None.

  • Provenance and peer review Not commissioned; not externally peer reviewed.

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