We've moved from an era of ignorance about what causes cancer, in which cancer was commonly ascribed to personal psychological characteristics, to a modern molecular understanding of the true biological causes of cancer.
Pasamos de ignorar las causas del cáncer, que antes se atribuía a rasgos psicológicos del individuo, al conocimiento avanzado de las moléculas, que permitió conocer las causas biológicas verdaderas del cáncer.