Not much information is available on the number of cancer patients in the tribal regions of India and the common cancers in such areas.
Links:
[1] http://admin.indiaenvironmentportal.org.in/news/gadchiroli-mouth-cancer-incidence-among-highest-country-over-500-new-cases-every-year-report
[2] http://admin.indiaenvironmentportal.org.in/category/newspaper/indian-express-pune
[3] http://admin.indiaenvironmentportal.org.in/category/thesaurus/maharashtra
[4] http://admin.indiaenvironmentportal.org.in/category/thesaurus/cancer
[5] http://admin.indiaenvironmentportal.org.in/category/thesaurus/gadchiroli-d
[6] http://admin.indiaenvironmentportal.org.in/category/thesaurus/developing-countries
[7] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health-effects
[8] http://admin.indiaenvironmentportal.org.in/category/thesaurus/health