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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 …