- Ala228 variant of trail receptor 1 affecting the ligand binding site is associated with chronic lymphocytic leukemia, mantle cell lymphoma, prostate cancer, head and neck squamous cell carcinoma and bladder cancer. Wolf, S., Mertens, D., Pscherer, A., Schroeter, P., Winkler, D., Gröne, H.J., Hofele, C., Hemminki, K., Kumar, R., Steineck, G., Döhner, H., Stilgenbauer, S., Lichter, P. Int. J. Cancer (2006)