Understudied HPV-negative cervical cancer. (A) PubMed search results indicate that the number of published works on HPV-negative cervical cancer (blue) is significantly lower than that on overall cervical cancer research (red). (B) The percentage of published work on HPV-negative cervical cancer (1.46%, right) is lower than the actual incidence rate of HPV-negative cervical cancers in the clinic (3-8%, left).