Which of the following factors are associated with an increased risk of skin cancer?
1) Albinism
2) Xeroderma pigmentosum
3) Immunosuppressive therapy
4) Chronic inflammation
5) Arsenical ingestion
6) Industrial carcinogens
7) Chronic ulcers
8) Draining osteomyelitis
9) Burn scars
10) Ionising radiation
11) Tobacco chewing