The cover shows a section of pelvic lymph node metastasis from a patient with prostate cancer. The double immunostaining with antibodies to visualize the Ki-67 proliferation antigen (fuchsia) and interleukin-30 (brown) shows a low proliferation rate in metastatic cancer cells lacking interleukin-30 expression. For details, see the article by Di Meo and colleagues on page 585 of this issue.