A 52-year-old postmenopausal woman from Rajasthan presents with vaginal bleeding for 3 months. Cervical examination reveals a friable, bleeding mass. Biopsy confirms squamous cell carcinoma of the cervix. Staging investigations (MRI pelvis and CT chest) show a 4 cm cervical lesion with parametrial invasion but no distant metastases. The tumor does not involve the pelvic sidewall or bladder/rectum. According to FIGO 2009 staging, what is the most likely stage of this malignancy?