A system for treating cervical and/or uterine cancers in brachytherapy with an intracavitary brachytherapy applicator, comprising: a tandem assembly comprising a tandem and a tandem connector , the tandem adapted for insertion into a cervix of a patient and the tandem connector adapted to receive the tandem within an interior of the tandem connector along a longitudinal axis, the tandem comprising a multi-lumen shaft configured to receive an optical fiber therethrough; an ovoid assembly comprising first and second adjustably inflatable ovoids and an ovoid support mechanism , the ovoid assembly comprising a unidirectional adjustment mechanism and first and second handles , the handles each having a multi-lumen shaft and being configured to support the respective first and second inflatable ovoids , wherein the handles are configured to allow for user manipulation to control a relative position of the ovoids using the unidirectional adjustment mechanism for insertion of the ovoids within fornices of a patient, the first and second adjustably inflatable ovoids having a deflated configuration for insertion into a patient and one or more adjustably inflated configurations for positioning the ovoid assembly during treatment; a first inflatable retractor adapted to be releasably coupled to the ovoid assembly , the first inflatable retractor having a deflated configuration for insertion into a patient and an adjustably inflated configuration for retraction of tissue during treatment; wherein the tandem and the first and second inflatable ovoids are adapted to be coupled to a radioactive source to deliver an implant radiation dose suitable for cancer treatment at a cancerous cervical and/or uterus treatment site in a patient; characterised in that the tandem connector has a plurality of adjustment elements arranged along the longitudinal axis for establishing a longitudinal position of the ovoid assembly relative to the tandem . a tandem assembly comprising a tandem and a tandem connector , the tandem adapted for insertion into a cervix of a patient and the tandem connector adapted to receive the tandem within an interior of the tandem connector along a longitudinal axis, the tandem comprising a multi-lumen shaft configured to receive an optical fiber therethrough; an ovoid assembly comprising first and second adjustably inflatable ovoids and an ovoid support mechanism , the ovoid assembly comprising a unidirectional adjustment mechanism and first and second handles , the handles each having a multi-lumen shaft and being configured to support the respective first and second inflatable ovoids , wherein the handles are configured to allow for user manipulation to control a relative position of the ovoids using the unidirectional adjustment mechanism for insertion of the ovoids within fornices of a patient, the first and second adjustably inflatable ovoids having a deflated configuration for insertion into a patient and one or more adjustably inflated configurations for positioning the ovoid assembly during treatment; a first inflatable retractor adapted to be releasably coupled to the ovoid assembly , the first inflatable retractor having a deflated configuration for insertion into a patient and an adjustably inflated configuration for retraction of tissue during treatment; wherein the tandem and the first and second inflatable ovoids are adapted to be coupled to a radioactive source to deliver an implant radiation dose suitable for cancer treatment at a cancerous cervical and/or uterus treatment site in a patient; characterised in that the tandem connector has a plurality of adjustment elements arranged along the longitudinal axis for establishing a longitudinal position of the ovoid assembly relative to the tandem . <EOS>