Timescale of tumor volume of a young breast cancer patient with luminal B subtype: A case report.

Rationale: It is largely unknown about the tumor growth of breast cancer naturally. We devised and analyzed an appropriate mathematical tool of the equations that describe how fast tumors grow without treatment on the basis of the ellipsoid shape of solid breast cancer.

Patient Concerns: A 31-year-old woman presented with a painless palpable lump in her left breast for 5 months.

Diagnosis: Infiltrated ductal breast cancer (histologic grade II) of luminal B INTERVENTIONS:: The patient did not receive any therapy due to her private reasons for 2 years, the analysis of the tumor volume growth was done regarding the growth rate of the tumor in the absence of intervention.

Outcomes: After 2 years of diagnosis of breast cancer, the tumor mass occupied the whole left breast with skin implanted and nipple abnormality. As this case indicated that the tumor's early growth rate was very slow. When the tumor volume reached 300 cm, its fast growth began without treatment. Later growth approached the maximum, when the tumor volume was more than 800 cm.

Lessons: The tumor growth is segmental without therapy. Early diagnosis and treatment is the key to good prognosis for every breast cancer patient.