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Colorectal cancer incidence in younger adults in India
  1. Aju Mathew1,2,
  2. Basil Baby2,
  3. Kevin Wang1,
  4. Bhawna Sirohi3,
  5. Feintong Lei4,
  6. Quan Chen5,
  7. Bin Huang4,5
  1. 1 Department of Internal Medicine, University of Kentucky, Lexington, Kentucky, USA
  2. 2 MOSC Medical College Hospital, Kolenchery, Kerala, India
  3. 3 Max Institute of Cancer Care, New Delhi, India
  4. 4 Department of Biostatistics, College of Public Health, University of Kentucky, Lexington, Kentucky, USA
  5. 5 Biostatistics and Bioinformatics Shared Facility, Markey Cancer Center, University of Kentucky, Lexington, KY, USA
  1. Correspondence to Dr Aju Mathew, MOSC Medical College, Kolenchery, Kochi 682311, India; drajumathew{at}

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Siegel et al 1 described patterns of colorectal cancer (CRC) incidence in young adults worldwide. In India, their estimates were based on data from a single population-based cancer registry (PBCR) in the southern Indian state of Tamil Nadu, representing 0.5% of Indian population (Chennai PBCR). India is a large country of more than a billion people. We analysed data from 14 PBCRs, representing 65 million people (5% of Indian population).2 PBCRs included in our study were Ahmedabad, Bangalore, Barshi, Bhopal, Chennai, Delhi, Dibrugarh, Kamrup, Kolkata, Manipur, Mizoram, Mumbai, Sikkim and Thiruvananthapuram.

We calculated age-standardised incidence rates (according to WHO World Standard Population 2000) for 5-year age groups for periods of diagnosis (2004–2005, 2006–2008, 2009–2011, 2012–2014), and categorised them as …

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