What is the major issue about the sun? Last summer (Early feb here in Oz) I ended up getting severe sunburn on my back and legs in spots I couldn't reach with sunscreen at the beach. I still notice some discoloured skin on my back. Is it because of an increase cancer risk? I'm a little concerned that I haven't got it checked...
Sunburns are bad with or without taking azathioprine - because of the increase of the likelihood of skin cancer.
However, azathioprine use increases the risk of skin cancer. It is unclear by how much. The important message to take away from it is a. be sure to put enough sun cream on you in the summer and don't do 1970s or 80s style sun exposure with full body sun burns... and b. to regularly visit your demartologist to get checked out (every 2 years or so).
The most important factor for skin cancer still remains a fair skin and excessive sun exposure. The good thing about taking azathioprine and knowing that it increases the risk of skin cancer is that once you are aware you are much more likely to take precautions and to get checked out regularly, reducing the stastically likelihood of problematic skin cancer to develop (because skin cancer detected early on can be treated quickly and effectively without much hassle).
Here is an article from 2008 on this subject:
http://onlinelibrary.wiley.com/doi/10.1002/ibd.20444/pdf
and the conclusion
"CONCLUSIONS
While most of the literature on immunosuppression and
NMSC has focused on organ transplant patients, the risk is
likely prevalent among all patients who require immunosuppression.
Studies regarding IBD and NMSC are rare and
inconsistent, but certainly have shown a trend toward an
increase in SCC risk and incidence, specifically in patients
with CD. More prospective studies should be performed to
elucidate this risk. It is important for practitioners to keep
NMSC’s in mind in counseling and screening patients who
are immunosuppressed for any reason. Carcinomas in these
patients are likely to be more aggressive and to present at an
earlier age than healthy patients. Patients should be educated
regarding signs and symptoms of premalignant tumors, nonmelanoma
skin tumors, as well as the importance of sun
protection. This certainly is important in those with who are
treated for IBD, and particularly light-skinned patients with a
significant sun-exposure history who are on azathioprine."
P.S. how much, if anything, azathioprine really increases all kinds of cancer (skin cancer) is still debated and there is no real conclusion, but does it really matter when it comes to skin cancer? Better to protect your skin (it's an important organ of your ;-) ) and know about skin cancer - that will get your risk of getting into trouble significantly below the general population's risk.
http://www.medscape.org/viewarticle/716862